Is it true that ..... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sameyrasmea72 · 01-13-2007, 01:42 PM

IF these trucks came with a 350 it would automaticly be a 4-bolt main engine?

cdowns · 01-13-2007, 01:44 PM

false

**kwmech** · 01-13-2007, 02:00 PM

The 1 tons more than likely. I took a 350 out of my 69 GMC 1 ton. It had/has a 4 bolt main with a steel crank.

krue · 01-13-2007, 02:03 PM

I've had a few and they were all 4 bolts, but that's just my experience.

**68350** · 01-13-2007, 03:48 PM

Every 69-72 chevy truck I have had that had the original 350, or one of the 69-72 PICKUP era, was a 4 bolt main. I am fairly sure that is TRUE!!

Aarons72s · 01-13-2007, 05:06 PM

4 barrel most likely 4 bolt mains. 2 barrel most likely 2 bolt mains. Ripped apart a 71 chevy with original 350, 2 barrel, and it was a 2 bolt main engine.

sameyrasmea72 · 01-13-2007, 10:56 PM

Well, that about 1/2 and 1/2, but no definite answer. I was wondering because I have been selling engines like crazy and most people seem to want 4 bolts. Is pulling the pan the only way to tell for sure?

On a side note, I wonder if I am selling these engines too cheap. I have been getting about $400 for a complete non-running 350 engine right out of a truck, and have sold every one of them I can get a hold of.

bad_turbo · 01-13-2007, 11:08 PM

Quote:

Originally Posted by sameyrasmea72

I have been getting about $400 for a complete non-running 350 engine right out of a truck, and have sold every one of them I can get a hold of.

WOW!!

68GMC454 · 01-14-2007, 12:02 AM

well id say if you tore it down and went through the block,,you would get more..might get more even with out the work..since everybody wants a 4 bolt main

72armyswbtruck · 01-14-2007, 08:31 AM

Six of one half dozen of the other.
I have always had to use the engine code on either the back of the engine or on the front near the water pump
Most that I have torn apart were two bolts

**jaros44sr** · 01-14-2007, 02:55 PM

I thought a quik guide was the harmonic balancer, if it was in the 8" range then that would say 4 bolt main to me. jm2c. other opinions? J.

PanelDeland · 01-14-2007, 03:03 PM

I see a lot of fairly knowledgable people looking for 4 bolt mains to build.I have to wonder why since if you are building for major power,you are better off to start with a 2 bolt and have it machined for splayed 4 bolt caps.The main reason given for this is that the webs of the 2 bolt are stronger and the splayed caps are even stronger than the factory 4 bolts.If someone were building a serious engine with the cost involved I would think buying the caps and having it machined would be a fairly simple and cheap way to get that strength.Also it seems like most of the aftermarket blocks use splayed 4 bolt mains also.
As to whether the engines are 2 bolt or 4 I have taken a couple of original to the truck apart,One 2 and one 4 that I recall.

kevenj · 01-14-2007, 03:11 PM

Quote:

Originally Posted by sameyrasmea72

IF these trucks came with a 350 it would automaticly be a 4-bolt main engine?

My '72 GMC 3/4 ton, 350 4bl (original engine) is 4 bolt main but with a cast crank. I have no idea if they all were this way.

**Ron 586** · 01-14-2007, 03:28 PM

Pull the pan and count the bolts. Then you know for sure.

Longhorn Man · 01-14-2007, 06:00 PM

dropping the pan is the only 100% sure way

Aarons72s · 01-14-2007, 07:51 PM

Drop the pan cause some of the casting numbers say 2 or 4 bolt when you look them up.

65-72 chevytoys · 01-14-2007, 09:06 PM

Quote:

Originally Posted by sameyrasmea72

Is pulling the pan the only way to tell for sure?

No you can run the block number on a site like www.mortec.com and it will tell you if it is a 2 or 4 bolt main.

On a side note, I wonder if I am selling these engines too cheap. I have been getting about $400 for a complete non-running 350 engine right out of a truck, and have sold every one of them I can get a hold of.

Usually in sales if you sell 100% of your inventory your price point is too low. For example selling 100% of your engines for $400 is too low. Try adjusting you price points higher until you reach 85-90% So if you charge $500 per engine and only sell 90% of you are about right, then if your inventory of the remaining amount drop your price a little or hold on to them for a while if you can.

sameyrasmea72 · 01-15-2007, 02:06 PM

Quote:

Originally Posted by 65-72 chevytoys

Usually in sales if you sell 100% of your inventory your price point is too low. For example selling 100% of your engines for $400 is too low. Try adjusting you price points higher until you reach 85-90% So if you charge $500 per engine and only sell 90% of you are about right, then if your inventory of the remaining amount drop your price a little or hold on to them for a while if you can.

Sounds like sound advice!

BUDDY · 01-15-2007, 03:06 PM

I heard once a long time ago that all of the GMC's came with 4-bolt mains, 'cause GMC only sells trucks, they would go a little out of their way to make sure they could justify someone buying a GMC over a chevy. FWIW.

In my blazer, with a 2-barrel original 350, it was a 2-bolt main.

Personally, if I were going to build a small block from stratch I'd prefer the 2-bolt because of this. When you are doing a full rebuild on an engine, it is totally worth it in my mind for the added assurance that this little mod would provide. Granted, it's a 3-400 dollar upgrade, and maybe it's not really needed for a truck motor, but when you decide to go all out with the supercharger or nitrous, you sure wouldn't have to worry about the bottom end here.

Later,
Buddy

crazy longhorn · 01-15-2007, 04:23 PM

The old "rule of thumb " that we went by , was..... 4 brl carb in a heavy (3/4 or 1 ton 2wd), or 4 brl /4wd was generally a hit for a 4 bolt block. the 1/2 ton 2wd's could be hit or miss, but the heavy trucks had em......

L

crm318 · 01-15-2007, 05:48 PM

the original engine in my 72 cheyenne is a 2 bolt main and its an orginal 4bbl 350.

Longhorn Man · 01-15-2007, 06:13 PM

the original 350 in my old 70 longhorn was a 4 bbl and 4 bolt high nickle (1020) block.

*Billla* · 01-15-2007, 06:25 PM

Quote:

Originally Posted by Longhorn Man

dropping the pan is the only 100% sure way

This isn't a new topic in the Chevy universe - there just isn't any other way to tell and all the rules of thumb out there (and there have been some really nutty ones!) have been disproven at one time or another.

Besides...that's part of the fun - SBC treasure hunt!

As for 4-bolt vs. 2-bolt; 2-bolts are good up to 400 HP w/studs, factory straight 4-bolts to 500 - anything beyond that and you'll definitely want steel caps. If you're not turning something past 6K or using power-adders (NOS, forced induction, etc) I wouldn't sweat bullets about it. Steel caps add about $450 to the build for the caps and machining. I'll probably have to put on my Nomex for this, but I've never seen a broken cap on a STREET 2- or 4-bolt factory block.

Sport/Truck · 01-16-2007, 06:10 PM

Quote:

Originally Posted by Aarons72s

4 barrel most likely 4 bolt mains. 2 barrel most likely 2 bolt mains. Ripped apart a 71 chevy with original 350, 2 barrel, and it was a 2 bolt main engine.

Quote:

Originally Posted by BUDDY

I heard once a long time ago that all of the GMC's came with 4-bolt mains, 'cause GMC only sells trucks, they would go a little out of their way to make sure they could justify someone buying a GMC over a chevy. FWIW.

In my blazer, with a 2-barrel original 350, it was a 2-bolt main.

Personally, if I were going to build a small block from stratch I'd prefer the 2-bolt because of this. When you are doing a full rebuild on an engine, it is totally worth it in my mind for the added assurance that this little mod would provide. Granted, it's a 3-400 dollar upgrade, and maybe it's not really needed for a truck motor, but when you decide to go all out with the supercharger or nitrous, you sure wouldn't have to worry about the bottom end here.

Later,
Buddy

I dropped my pan today to get a woodruff key out, re-seal etc. I also wanted to know if it was 4 bolt main or not. It is infact a 4 bolt.
So here's what I have: GMC with original 350 & 4 barrel carb.
s/t

Sport/Truck · 01-16-2007, 06:11 PM

Quote:

Originally Posted by Longhorn Man

the original 350 in my old 70 longhorn was a 4 bbl and 4 bolt high nickle (1020) block.

Longhorn what is a high nickle?

01-13-2007, 01:42 PM	#1
sameyrasmea72 Senior Member Join Date: Aug 2003 Location: Lubbock, Texas Posts: 2,443	Is it true that ..... IF these trucks came with a 350 it would automaticly be a 4-bolt main engine? __________________ 72 Cheyenne Super 80 Silverado Blazer 2wd

01-13-2007, 01:44 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Is it true that ..... false __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

01-13-2007, 02:00 PM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,717	Re: Is it true that ..... The 1 tons more than likely. I took a 350 out of my 69 GMC 1 ton. It had/has a 4 bolt main with a steel crank.

01-13-2007, 02:03 PM	#4
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Is it true that ..... I've had a few and they were all 4 bolts, but that's just my experience. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

01-13-2007, 03:48 PM	#5
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	Re: Is it true that ..... Every 69-72 chevy truck I have had that had the original 350, or one of the 69-72 PICKUP era, was a 4 bolt main. I am fairly sure that is TRUE!! __________________ 68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi

01-13-2007, 05:06 PM	#6
Aarons72s Registered User Join Date: Apr 2006 Location: oklahoma Posts: 10,669	Re: Is it true that ..... 4 barrel most likely 4 bolt mains. 2 barrel most likely 2 bolt mains. Ripped apart a 71 chevy with original 350, 2 barrel, and it was a 2 bolt main engine.

01-13-2007, 10:56 PM	#7
sameyrasmea72 Senior Member Join Date: Aug 2003 Location: Lubbock, Texas Posts: 2,443	Re: Is it true that ..... Well, that about 1/2 and 1/2, but no definite answer. I was wondering because I have been selling engines like crazy and most people seem to want 4 bolts. Is pulling the pan the only way to tell for sure? On a side note, I wonder if I am selling these engines too cheap. I have been getting about $400 for a complete non-running 350 engine right out of a truck, and have sold every one of them I can get a hold of. __________________ 72 Cheyenne Super 80 Silverado Blazer 2wd

01-14-2007, 12:02 AM	#9
68GMC454 THE VILLIAGE IDIOT Join Date: Nov 2006 Location: Tooele, Utah Posts: 1,405	Re: Is it true that ..... well id say if you tore it down and went through the block,,you would get more..might get more even with out the work..since everybody wants a 4 bolt main __________________ honestly honey,,i have no idea how that truck got here.

01-14-2007, 08:31 AM	#10
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,033	Re: Is it true that ..... Six of one half dozen of the other. I have always had to use the engine code on either the back of the engine or on the front near the water pump Most that I have torn apart were two bolts __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!" Last edited by 72armyswbtruck; 01-14-2007 at 08:31 AM.

01-14-2007, 02:55 PM	#11
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,840	Re: Is it true that ..... I thought a quik guide was the harmonic balancer, if it was in the 8" range then that would say 4 bolt main to me. jm2c. other opinions? J. __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

01-14-2007, 03:03 PM	#12
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: Is it true that ..... I see a lot of fairly knowledgable people looking for 4 bolt mains to build.I have to wonder why since if you are building for major power,you are better off to start with a 2 bolt and have it machined for splayed 4 bolt caps.The main reason given for this is that the webs of the 2 bolt are stronger and the splayed caps are even stronger than the factory 4 bolts.If someone were building a serious engine with the cost involved I would think buying the caps and having it machined would be a fairly simple and cheap way to get that strength.Also it seems like most of the aftermarket blocks use splayed 4 bolt mains also. As to whether the engines are 2 bolt or 4 I have taken a couple of original to the truck apart,One 2 and one 4 that I recall. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

01-14-2007, 03:28 PM	#14
Ron 586 RIP Mr Ron Join Date: Dec 2005 Location: Big Sandy, Tn. 38221 Posts: 8,150	Re: Is it true that ..... Pull the pan and count the bolts. Then you know for sure. __________________ Ron (Mr Round Tuit) Be kinder than necessary, for everyone you meet is fighting some kind of battle TN Message Forum TN Facebook Group SETN Truck Show My Photobucket

01-14-2007, 06:00 PM	#15
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Is it true that ..... dropping the pan is the only 100% sure way

01-14-2007, 07:51 PM	#16
Aarons72s Registered User Join Date: Apr 2006 Location: oklahoma Posts: 10,669	Re: Is it true that ..... Drop the pan cause some of the casting numbers say 2 or 4 bolt when you look them up.

01-15-2007, 03:06 PM	#19
BUDDY Global warming is a myth Join Date: Apr 2003 Location: Henderson, NV Posts: 208	Re: Is it true that ..... I heard once a long time ago that all of the GMC's came with 4-bolt mains, 'cause GMC only sells trucks, they would go a little out of their way to make sure they could justify someone buying a GMC over a chevy. FWIW. In my blazer, with a 2-barrel original 350, it was a 2-bolt main. Personally, if I were going to build a small block from stratch I'd prefer the 2-bolt because of this. When you are doing a full rebuild on an engine, it is totally worth it in my mind for the added assurance that this little mod would provide. Granted, it's a 3-400 dollar upgrade, and maybe it's not really needed for a truck motor, but when you decide to go all out with the supercharger or nitrous, you sure wouldn't have to worry about the bottom end here. Later, Buddy __________________ Henderson, NV 1972 K5 - Lifelong project - Needs Time, Place, Help & Parts!! 1990 K5 with 37's 2003 Discovery SE7 - Wife's



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01-15-2007, 04:23 PM	#20
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: Is it true that ..... The old "rule of thumb " that we went by , was..... 4 brl carb in a heavy (3/4 or 1 ton 2wd), or 4 brl /4wd was generally a hit for a 4 bolt block. the 1/2 ton 2wd's could be hit or miss, but the heavy trucks had em...... L __________________ 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....

01-15-2007, 05:48 PM	#21
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: Is it true that ..... the original engine in my 72 cheyenne is a 2 bolt main and its an orginal 4bbl 350. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

01-15-2007, 06:13 PM	#22
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Is it true that ..... the original 350 in my old 70 longhorn was a 4 bbl and 4 bolt high nickle (1020) block. Last edited by Longhorn Man; 01-15-2007 at 06:13 PM.

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