The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-07-2021, 06:56 PM   #1
pjmoreland
Senior Member

 
pjmoreland's Avatar
 
Join Date: Jan 2005
Location: CA
Posts: 5,981
Budget Vortec Head Upgrade

I installed a set of L31 Vortec heads on my 1979 3970010 block recently, and I couldn't be more pleased with the outcome. This engine has some serious punch now. The block is machined .060 over, and a previous owner upgraded to flat top pistons. The block has not been decked, which is a good thing when it comes to keeping the compression ratio at a reasonable level. In case anyone else is considering doing this upgrade, here is a list of the parts I used. I tried to keep the cost down as much as I could.

Here's a little video of it in action.

https://youtu.be/dh2woxXvRXE


Parts List

10239906 Vortec heads from a 1998 C1500 $140
CL12-242-2 Comp Cams XE268H cam & hydraulic flat tappet lifter set $189
PR7825312-16 BTR pushrods, .025 longer than stock $94
12499224 GM LS1 valve spring set $80
787-16 Comp Cams spring retainers $57
555-513002 Jegs intake manifold $140 (price went up since I bought it)
3/8 temperature sender from member A1971Blazer $45
1590 Comp Cams break in oil $50
2900 Comp Cams timing chain set $35
4605 Comp Cams cam lock plate $5
1003 Felpro head gaskets $80
ES72856 Felpro head bolt sets $38
MS98000T Felpro intake manifold & valve cover gasket set $51
TCS45121 Felpro timing chain cover gasket set $10
TR5/2238 NGK spark plugs $24
82180 Permatex ultra black RTV $6
6039 Mr. Gasket kickdown cable bracket $23
Total $1167
Attached Images
 

Last edited by pjmoreland; 04-14-2021 at 06:33 PM.
pjmoreland is offline   Reply With Quote
Old 02-07-2021, 09:37 PM   #2
cj847
Registered User
 
cj847's Avatar
 
Join Date: Sep 2016
Location: Ozark, MO
Posts: 573
Re: Budget Vortec Head Upgrade

Great list of parts.

Just curious, why didn't you opt for the roller cam?
cj847 is offline   Reply With Quote
Old 02-07-2021, 09:40 PM   #3
pjmoreland
Senior Member

 
pjmoreland's Avatar
 
Join Date: Jan 2005
Location: CA
Posts: 5,981
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by cj847 View Post
Great list of parts.

Just curious, why didn't you opt for the roller cam?
Because I'm cheap, and felt like this old engine wasn't worth the extra money of a roller cam. I did debate it, and it would help with durability and performance.
pjmoreland is offline   Reply With Quote
Old 02-07-2021, 10:01 PM   #4
i82much
Registered User
 
Join Date: Jul 2008
Location: Bowie, MD
Posts: 313
Re: Budget Vortec Head Upgrade

sounds good!
i82much is offline   Reply With Quote
Old 02-07-2021, 10:02 PM   #5
pjmoreland
Senior Member

 
pjmoreland's Avatar
 
Join Date: Jan 2005
Location: CA
Posts: 5,981
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by i82much View Post
sounds good!
Thanks... at least what you can hear over my rattling windows.
pjmoreland is offline   Reply With Quote
Old 02-07-2021, 10:13 PM   #6
Steeveedee
Who Changed This?
 
Steeveedee's Avatar
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,677
Re: Budget Vortec Head Upgrade

My understanding is that a roller cam is best at higher RPM. Anyone use a roller cam for a tow vehicle, which is all about low-RPM torque?
__________________
~Steven

'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper

Simi Valley, CA
Steeveedee is offline   Reply With Quote
Old 02-08-2021, 12:17 AM   #7
MikeB
Senior Member
 
MikeB's Avatar
 
Join Date: Jul 2000
Location: North Texas
Posts: 3,597
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by Steeveedee View Post
My understanding is that a roller cam is best at higher RPM. Anyone use a roller cam for a tow vehicle, which is all about low-RPM torque?
Good for a little more "area under the curve" which means a powerband that is around 500 RPM wider. Roller lifters are quite heavy though, so valve train needs to be able to control them at higher RPMs.

Also, for the 010 block he would need a retrofit roller cam and lifters, which costs a lot more than flat tappet cam and lifters, or even roller cam and lifters for a 86-up roller cam block.
__________________
Mike
1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
MikeB is offline   Reply With Quote
Old 02-08-2021, 09:26 AM   #8
57taskforce
All about them K’s
 
57taskforce's Avatar
 
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,487
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by Steeveedee View Post
My understanding is that a roller cam is best at higher RPM. Anyone use a roller cam for a tow vehicle, which is all about low-RPM torque?
Yep, GM did in both the small blocks and big blocks. All the 96+ vortec truck engines were roller cam, as well as all the LS engines.

Op, nice work. I bet it runs light years better than it did before. I’ve got a vortec 350 block that I’m building up right now. I’ve got a set of aftermarket aluminum heads for it though. I’ve got 2 sets of good vortec heads sitting on the floor that I need to get built up and stashed in my shop for another day.
__________________
Tyler
'57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888
'72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879
‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206
'98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s
57taskforce is offline   Reply With Quote
Old 02-08-2021, 09:39 AM   #9
ChevyRacefan
Registered User
 
ChevyRacefan's Avatar
 
Join Date: Sep 2013
Location: Newton,N.C.
Posts: 317
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by Steeveedee View Post
My understanding is that a roller cam is best at higher RPM. Anyone use a roller cam for a tow vehicle, which is all about low-RPM torque?
G.m. did not add them to truck engines for high rpm.
Today's oils and metal on metal sliding movement don't jive.
It is also why the rockers on ls and up are not rockers sliding on a half ball .
I know the back and forth on this. but fact is oem's have bean counters that don't spend money unless it is needed. If a flatt tappet and ball type rockers would last and not fail. they still be in use.
ChevyRacefan is offline   Reply With Quote
Old 02-08-2021, 10:36 AM   #10
pjmoreland
Senior Member

 
pjmoreland's Avatar
 
Join Date: Jan 2005
Location: CA
Posts: 5,981
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by ChevyRacefan View Post
G.m. did not add them to truck engines for high rpm.
Today's oils and metal on metal sliding movement don't jive.
It is also why the rockers on ls and up are not rockers sliding on a half ball .
I know the back and forth on this. but fact is oem's have bean counters that don't spend money unless it is needed. If a flatt tappet and ball type rockers would last and not fail. they still be in use.
I added ZDDP to my oil, and I plan to continue doing this to try to address this wear issue.
pjmoreland is offline   Reply With Quote
Old 02-08-2021, 01:24 AM   #11
i82much
Registered User
 
Join Date: Jul 2008
Location: Bowie, MD
Posts: 313
Re: Budget Vortec Head Upgrade

what heads were on it before?
i82much is offline   Reply With Quote
Old 02-08-2021, 01:48 AM   #12
pjmoreland
Senior Member

 
pjmoreland's Avatar
 
Join Date: Jan 2005
Location: CA
Posts: 5,981
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by i82much View Post
what heads were on it before?
1968-76 3998991 307, 350 1.72int 1.5exh 75cc

The intake valves on the Vortec heads are quite a bit bigger at 1.94".

Based on the Summit Racing compression ratio calculator, my compression ratio went from 8.68:1 up to 9.77:1 based on a 4.060" bore, 3.480" stroke, .025" deck clearance (measured), .041 head gasket thickness, 6cc piston dome volume (a guess), and 75cc vs. 64cc combustion chamber volume. I was hoping for 9.56:1 for the compression ratio, which would have been the case if the cylinders hadn't been bored out, but it seems to run well on 91 octane. I can't hear any detonation, so hopefully I'll be alright. The carb is running a bit rich at the moment, and I have the timing set kind of low at 8 degrees. I will be playing around with settings over the next few weeks.
pjmoreland is offline   Reply With Quote
Old 02-08-2021, 07:09 PM   #13
i82much
Registered User
 
Join Date: Jul 2008
Location: Bowie, MD
Posts: 313
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by pjmoreland View Post
1968-76 3998991 307, 350 1.72int 1.5exh 75cc

The intake valves on the Vortec heads are quite a bit bigger at 1.94".

Based on the Summit Racing compression ratio calculator, my compression ratio went from 8.68:1 up to 9.77:1 based on a 4.060" bore, 3.480" stroke, .025" deck clearance (measured), .041 head gasket thickness, 6cc piston dome volume (a guess), and 75cc vs. 64cc combustion chamber volume. I was hoping for 9.56:1 for the compression ratio, which would have been the case if the cylinders hadn't been bored out, but it seems to run well on 91 octane. I can't hear any detonation, so hopefully I'll be alright. The carb is running a bit rich at the moment, and I have the timing set kind of low at 8 degrees. I will be playing around with settings over the next few weeks.
thanks. i have heard the vortec heads are a nice step up even over the older high performance heads, so i'm sure the improvement over the 307 heads is substantial!
i82much is offline   Reply With Quote
Old 02-08-2021, 09:00 PM   #14
jocko
Senior Member
 
jocko's Avatar
 
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,975
Re: Budget Vortec Head Upgrade

Here's how you can run original valve covers:
https://www.ebay.com/itm/Speedway-Ce...ss!76028!US!-1

https://www.ebay.com/itm/SBC-Valve-C...rd!76028!US!-1

Note that some have a rubber seal that in a machined slot while others use dual gaskets above and below the adapter. I'd be interested in hearing if anyone has used the rubber seal in the machined slot type as to whether there were any leakage issues. I'd "think" they'd be less likely to leak than stock gaskets, but then again, not sure how rigid the adapters are. I have a couple sets of actual GM adapters that I plan to use - found them at an old Chevy dealer near where I grew up - called the lady behind the parts desk, she even knew some of my relatives, and boom, they were in the mail. GM used to make these adapters shortly after the vortec heads came out, but I don't think they still do. From what I could tell they are identical to the ones offered by Speedway.
Attached Images
 
jocko is offline   Reply With Quote
Old 02-08-2021, 09:11 PM   #15
pjmoreland
Senior Member

 
pjmoreland's Avatar
 
Join Date: Jan 2005
Location: CA
Posts: 5,981
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by jocko View Post
Here's how you can run original valve covers:
https://www.ebay.com/itm/Speedway-Ce...ss!76028!US!-1

https://www.ebay.com/itm/SBC-Valve-C...rd!76028!US!-1

Note that some have a rubber seal that in a machined slot while others use dual gaskets above and below the adapter. I'd be interested in hearing if anyone has used the rubber seal in the machined slot type as to whether there were any leakage issues. I'd "think" they'd be less likely to leak than stock gaskets, but then again, not sure how rigid the adapters are. I have a couple sets of actual GM adapters that I plan to use - found them at an old Chevy dealer near where I grew up - called the lady behind the parts desk, she even knew some of my relatives, and boom, they were in the mail. GM used to make these adapters shortly after the vortec heads came out, but I don't think they still do. From what I could tell they are identical to the ones offered by Speedway.
Interesting. It seems the machined slot style wouldn't be as thick and noticeable since there wouldn't be a stock gasket underneath it. I would think that the valve cover would help keep the adapter rigid.
pjmoreland is offline   Reply With Quote
Old 02-08-2021, 04:39 AM   #16
ChevyRacefan
Registered User
 
ChevyRacefan's Avatar
 
Join Date: Sep 2013
Location: Newton,N.C.
Posts: 317
Re: Budget Vortec Head Upgrade

Anyone that does this. a few things before you put them on your short block

1)open up the push rod holes in the head. he push rod will hit the head opening with any lift, and /or 1.6 rockers.
2) beehive springs will get you a little more lift before hitting the guide seal and top of guide.
3) 1.6 full roller rockers. this adds lift without having to have the heads machined, IIRC after .480 lift you are machining the heads.

G.M. gets 330 hp out of the 350 with low (by todays standards) lift.
ChevyRacefan is offline   Reply With Quote
Old 02-08-2021, 10:46 AM   #17
MikeB
Senior Member
 
MikeB's Avatar
 
Join Date: Jul 2000
Location: North Texas
Posts: 3,597
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by ChevyRacefan View Post
Anyone that does this. a few things before you put them on your short block

1)open up the push rod holes in the head. The push rod will hit the head opening with any lift, and /or 1.6 rockers.
2) beehive springs will get you a little more lift before hitting the guide seal and top of guide.
3) 1.6 full roller rockers. this adds lift without having to have the heads machined, IIRC after .480 lift you are machining the heads.

G.M. gets 330 hp out of the 350 with low (by todays standards) lift.
All good advice. I would add that quench height (deck-to-piston clearance + gasket thickness) should be ≤.050", and probably closer to .040" for better quench. However, in the OP's case, he is already at 9.77:1, so he would need new dished pistons, a D-shaped dish being preferable.

FWIW, in the past I have used GMPP LS6 beehive springs with CompCams #787 retainers and #648 locks installed at 1.750" to work with an additional .050" lift at valve.
__________________
Mike
1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
MikeB is offline   Reply With Quote
Old 02-08-2021, 09:12 AM   #18
Rich72C10
Mr. Cheyenne
 
Rich72C10's Avatar
 
Join Date: Jun 2020
Location: Kyle, Texas
Posts: 1,687
Re: Budget Vortec Head Upgrade

makes me think I should have went ahead and did that, instead of staying stock. lol
__________________
Richard

'72 Chevy C10 Cheyenne *Super WHT/MED BRONZE/WHT
SBC 350 | TH350 | LWB | AC | Buddy Seats
Upgrades: Tilt | Front Sway Bar | Radio | Sliding Window | Bed Spare w/Lock
Bed Rails | Full LEDs | Courtesy Lights | Tachometer | Glovebox Lock & Light | Head Light Relays | *Upgraded Fully Super Trim
Rich72C10 is offline   Reply With Quote
Old 02-08-2021, 11:16 AM   #19
pjmoreland
Senior Member

 
pjmoreland's Avatar
 
Join Date: Jan 2005
Location: CA
Posts: 5,981
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by Rich72C10 View Post
makes me think I should have went ahead and did that, instead of staying stock. lol
I do miss the look of the original valve covers with the perimeter bolts.
pjmoreland is offline   Reply With Quote
Old 02-08-2021, 11:37 AM   #20
ChevyRacefan
Registered User
 
ChevyRacefan's Avatar
 
Join Date: Sep 2013
Location: Newton,N.C.
Posts: 317
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by pjmoreland View Post
I do miss the look of the original valve covers with the perimeter bolts.
They make adapters if you have to have the old look.
ChevyRacefan is offline   Reply With Quote
Old 02-08-2021, 12:27 PM   #21
Big Kev-O
Registered User
 
Big Kev-O's Avatar
 
Join Date: Mar 2014
Location: Simi, CA
Posts: 495
Re: Budget Vortec Head Upgrade

I did a similar build with Vortec heads and a Edlebrock 2116 intake. I used the Eddy 7235 intake gaskets similar to your Mr Gasket 136G. Engine ran like a champ for first couple thousand miles than started idling rough, fouling plugs and smoking out the tailpipes. Changed the gaskets thinking maybe I messed up the install, same results. After searching the web I discovered this was common issue Vortec heads when paper/felt style gaskets are used. Lots of builders recommend steel rubber impregnated gaskets found in the Felpro MS98000T kit so i gave them a try. Problem solved.

So if you start smoking check your intake gaskets.
__________________
Made in America by Americans
Big Kev-O is offline   Reply With Quote
Old 02-08-2021, 12:29 PM   #22
pjmoreland
Senior Member

 
pjmoreland's Avatar
 
Join Date: Jan 2005
Location: CA
Posts: 5,981
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by Big Kev-O View Post
I did a similar build with Vortec heads and a Edlebrock 2116 intake. I used the Eddy 7235 intake gaskets similar to your Mr Gasket 136G. Engine ran like a champ for first couple thousand miles than started idling rough, fouling plugs and smoking out the tailpipes. Changed the gaskets thinking maybe I messed up the install, same results. After searching the web I discovered this was common issue Vortec heads when paper/felt style gaskets are used. Lots of builders recommend steel rubber impregnated gaskets found in the Felpro MS98000T kit so i gave them a try. Problem solved.

So if you start smoking check your intake gaskets.
Thanks for the heads up
pjmoreland is offline   Reply With Quote
Old 02-08-2021, 12:49 PM   #23
MikeB
Senior Member
 
MikeB's Avatar
 
Join Date: Jul 2000
Location: North Texas
Posts: 3,597
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by Big Kev-O View Post
Engine ran like a champ for first couple thousand miles than started idling rough, fouling plugs and smoking out the tailpipes. Changed the gaskets thinking maybe I messed up the install, same results. After searching the web I discovered this was common issue Vortec heads when paper/felt style gaskets are used. Lots of builders recommend steel rubber impregnated gaskets found in the Felpro MS98000T kit so i gave them a try. Problem solved.

So if you start smoking check your intake gaskets.
I used GM 89017465 intake gaskets with a Weiand 8121 manifold. No issues at all after 3K-4K miles. I think they are the second or third version made by GM. In fact, there may even be a later version!

I've read where it's very important to follow the manifold torqueing procedures.
__________________
Mike
1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
MikeB is offline   Reply With Quote
Old 02-09-2021, 04:31 AM   #24
ChevyRacefan
Registered User
 
ChevyRacefan's Avatar
 
Join Date: Sep 2013
Location: Newton,N.C.
Posts: 317
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by Big Kev-O View Post
I did a similar build with Vortec heads and a Edlebrock 2116 intake. I used the Eddy 7235 intake gaskets similar to your Mr Gasket 136G. Engine ran like a champ for first couple thousand miles than started idling rough, fouling plugs and smoking out the tailpipes. Changed the gaskets thinking maybe I messed up the install, same results. After searching the web I discovered this was common issue Vortec heads when paper/felt style gaskets are used. Lots of builders recommend steel rubber impregnated gaskets found in the Felpro MS98000T kit so i gave them a try. Problem solved.

So if you start smoking check your intake gaskets.
I cheated.
I started with a g.m. crate engine for a 3/4 ton and up. As they are have 4 bolt mains over the 1/2 ton 2 bolt. (2 bolt mains part number ends with a 2, the 4 bolt main crate ends with a 3) . 2021.52
Bought the ram jet roller cam, (172.63) 1.6 roller rockers,(227.95) ls9 beehive springs and comp cams retainers and locks. (112.31)
Drilled out the push rod holes , slowly as I did not pull the heads.
Edelbrook dual pattern(339.95) you can bolt on a q-jet or a square bore carb) intake . cast alum valve covers (118.95) short water pump (45.00)
one piece rubber oil pan gasket (24.94) timing cover gasket (5.56) rubber valve cover gaskets (19.92).melonized distributor gear 45.99) had HEI and The carb rebuild kit and new float for the q-jet was 18.67 and 7.99
Carb studs. 8.95, a tube of rtv for the intake china walls. 7.65, thermostat and gasket 11.54 engine paint 9.23 bolts for water pump 3.12 90's truck flexplate with the newer bolt pattern 65.99
Should have 330-340hp as it is a ramjet long block now.
ChevyRacefan is offline   Reply With Quote
Old 02-09-2021, 08:59 PM   #25
garyd1961
Registered User
 
Join Date: May 2016
Location: Henderson NC
Posts: 975
Re: Budget Vortec Head Upgrade

Quote:
Originally Posted by ChevyRacefan View Post
They make adapters if you have to have the old look.
Not referring to you personally but I just don't understand this. The center bolt valve covers is an upgrade just like the roller cam and one piece rear seal. Yet people pay extra so they can put the old leaky type valve covers back on. For what? It's only bolts not every other bolt is the same as factory.
garyd1961 is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:27 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com