305 60cc heads on a 350 block - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jacquesdean · 05-06-2003, 12:32 AM

A friend gave me this engine 3970014 with a set of 305 heads 60cc installed on it. It was in a 1970 chevelle.

What benifit if any will this be compared to running a set of 882 heads.

Appreciate your input.

cableguy0 · 05-06-2003, 12:42 AM

probably not at all it will most likely hurt ur performance because the 305 heads have very small ports and are restrictive though they will bump up the compression the loss in flow isnt worth it. i would go with the 882's and if the budget allows get em ported and have the larger valves installed

Blue_71 · 05-06-2003, 12:42 AM

higher compression, BUT, unless ported out the butt, the runners are smaller and wont flow as well

crazy4chevs · 05-06-2003, 01:21 AM

I agree with them, thats three in a row your outta there!

no seriously go with the 882's.

Project1970 · 05-06-2003, 02:09 AM

Yet another in agreement...the 305 heads will work if you've got nothing else, but they can't flow enough for even a mild 350, let alone a healthy one.

Just one last thought...remember, pretty much everything they ever did to the 305 was in an effort to find as much torque as possible at any cost. That's why TPI was created, actually; to give the 305 as much torque as the 350, by using those huge intake runners. Though it makes no sense as to why they never took the TPI to the truck side...it would've been a better choice than TBI, stock-to-stock.

73stepside · 05-06-2003, 04:34 AM

the 416 305 heads are the best of the small port heads. they flowed almost as good as any 350 head. the 416 are the HO heads. they will perform well ported and polished, but becareful porting intake runners, they are thin.

Ed ke6bnl · 05-06-2003, 07:28 AM

Quote:

Originally posted by 73stepside
the 416 305 heads are the best of the small port heads. they flowed almost as good as any 350 head. the 416 are the HO heads. they will perform well ported and polished, but becareful porting intake runners, they are thin.

I believe that is the combontion that I got with this used 350
14010207 Block 350 2 bolt 1980-85

with 1401416 Heads 1980-86 305 1.84/1.5 58cc

is this going to be too high a compression motor?? Will this make for a good strong engine ?? comments thanks Ed ke6bnl

Ed ke6bnl · 05-06-2003, 02:07 PM

Quote:

Originally posted by Ed ke6bnl

I believe that is the combontion that I got with this used 350
14010207 Block 350 2 bolt 1980-85

with 1401416 Heads 1980-86 305 1.84/1.5 58cc

is this going to be too high a compression motor?? Will this make for a good strong engine ?? comments thanks Ed ke6bnl

I would like to add a question, will these 305 heads be good to put on my 327 sbc block?? any suggestions appreciated thanks Ed

Project1970 · 05-06-2003, 02:52 PM

Regarding compression...with my 64cc Vortecs and flattop pistons, I'm pushing roughly 10.2:1 compression. Dropping the extra 4cc's would raise compression a bit beyond that, even.

305 heads would work a little better on a 327 than they would a 350, simply because there's a little less air that needs to be flowed; however, you still end up with awfully high compression and relatively low flow because the 305 heads were designed for a skinny little bore.

Longhorn Man · 05-07-2003, 12:03 AM

I have done this...and DO NOT recomend it.
While I don't know the casting # of the 305 heads that were given to me, I do know I had to run 93 octain and one bottle of octain booster, plus the timing had to be set at about 4 degrees BTDC. (granted...mine had been milled a bit to get a good surface)
All this for crappy performance.
305 heads are an awsome (cheap) way to update a 283 or a 307 for modern unleaded gasoline...but other than that...they are a last case cenereo.
882 heads have been given a bed reputation. As far as smogger heads go, they are one of the best flowing out there. (the best of the worst if you will)
I have a set of miledly ported 882s on my 350, and it is aproaching 100,000 abusive miles. The guy i got it off of was doing 13s in the 1/4 in a 67 long/fleet, and I sure as hell don't baby it either.
As for overheating and crackig them...I had mine up to 260 degrees once when i tossed a belt on the freeway. She lived to tell about it with no drop in compression.

crazy longhorn · 05-07-2003, 12:14 AM

The 305 head s will poop out around 4500 on a 350.....been there , & tryed that! For a low rpm "grunt motor" , they could work out with the proper cam. good luck,crazyL

05-06-2003, 12:32 AM	#1
jacquesdean Registered User Join Date: Jan 2003 Location: Snead, Alabama Posts: 399	305 60cc heads on a 350 block A friend gave me this engine 3970014 with a set of 305 heads 60cc installed on it. It was in a 1970 chevelle. What benifit if any will this be compared to running a set of 882 heads. Appreciate your input. __________________ Jock, Powder blasting shop, Alabama

05-06-2003, 12:42 AM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	probably not at all it will most likely hurt ur performance because the 305 heads have very small ports and are restrictive though they will bump up the compression the loss in flow isnt worth it. i would go with the 882's and if the budget allows get em ported and have the larger valves installed __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

05-06-2003, 01:21 AM	#4
crazy4chevs Registered User Join Date: Oct 2002 Location: Des Moines WA. (Kent, area) Posts: 668	I agree with them, thats three in a row your outta there! no seriously go with the 882's. __________________ 70 chev c10 swb fleet 72 grill, sb 400, 2/4 drop. 68 chev c10 swb fleet Early classic 4/6 drop with 4wheel disc brakes 9"rear 67-8 buckets tilt and A/C Classic GM Truck Club of Washington .

05-06-2003, 02:09 AM	#5
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	Yet another in agreement...the 305 heads will work if you've got nothing else, but they can't flow enough for even a mild 350, let alone a healthy one. Just one last thought...remember, pretty much everything they ever did to the 305 was in an effort to find as much torque as possible at any cost. That's why TPI was created, actually; to give the 305 as much torque as the 350, by using those huge intake runners. Though it makes no sense as to why they never took the TPI to the truck side...it would've been a better choice than TBI, stock-to-stock. __________________ Project1970 - LS1 Swap Complete!

05-06-2003, 04:34 AM	#6
73stepside Registered User Join Date: Feb 2002 Location: Moore OK 73160 Posts: 974	the 416 305 heads are the best of the small port heads. they flowed almost as good as any 350 head. the 416 are the HO heads. they will perform well ported and polished, but becareful porting intake runners, they are thin. __________________ 04 GMC Sierra RCSS 70 CST LWB 04 HD Sportster 1200 Custom

05-06-2003, 02:52 PM	#9
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	Regarding compression...with my 64cc Vortecs and flattop pistons, I'm pushing roughly 10.2:1 compression. Dropping the extra 4cc's would raise compression a bit beyond that, even. 305 heads would work a little better on a 327 than they would a 350, simply because there's a little less air that needs to be flowed; however, you still end up with awfully high compression and relatively low flow because the 305 heads were designed for a skinny little bore. __________________ Project1970 - LS1 Swap Complete!

05-07-2003, 12:03 AM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	I have done this...and DO NOT recomend it. While I don't know the casting # of the 305 heads that were given to me, I do know I had to run 93 octain and one bottle of octain booster, plus the timing had to be set at about 4 degrees BTDC. (granted...mine had been milled a bit to get a good surface) All this for crappy performance. 305 heads are an awsome (cheap) way to update a 283 or a 307 for modern unleaded gasoline...but other than that...they are a last case cenereo. 882 heads have been given a bed reputation. As far as smogger heads go, they are one of the best flowing out there. (the best of the worst if you will) I have a set of miledly ported 882s on my 350, and it is aproaching 100,000 abusive miles. The guy i got it off of was doing 13s in the 1/4 in a 67 long/fleet, and I sure as hell don't baby it either. As for overheating and crackig them...I had mine up to 260 degrees once when i tossed a belt on the freeway. She lived to tell about it with no drop in compression.

05-07-2003, 12:14 AM	#11
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	The 305 head s will poop out around 4500 on a 350.....been there , & tryed that! For a low rpm "grunt motor" , they could work out with the proper cam. good luck,crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....



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