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#1 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
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urban legend , truth or trash ?????
The legend is: all 350 truck engines were 4-bolt mains. Is this so???
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#2 |
Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,335
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I have seen both but by all means I am not a expert.
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#3 |
Senior Member
Join Date: Nov 2004
Location: Vacaville, CA
Posts: 2,272
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I would say NO. I have seen a lot of truck motors that were 2 bolt, nothing wrong with a 2 bolt.
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#4 |
Too Many Clubs Club
Join Date: Jul 2003
Location: Kilgore, Texas
Posts: 443
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I say no as well. I had a 350 2-bolt in my truck back in the day.
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#5 |
Registered User
Join Date: Sep 2004
Location: Louisville, Ky
Posts: 329
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If they were all 4 bolts, engine builders/sellers wouldn't brag about motors being 4 bolts.
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Brian 72 C10 longbed 350/th400 Let the world change you and you will change the world. |
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#6 |
Registered User
Join Date: Aug 2002
Location: Muskogee, Oklahoma
Posts: 2,914
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Definitely NO. Not all 350's are 4 bolt mains. Take a 3970010 for instance, it could be a 2 or 4 bolt main.
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#7 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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4bolts are overrated
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#8 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Better to have and not need, than to need and not have.
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"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" |
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#9 |
Registered User
Join Date: Nov 2003
Location: st. louis area
Posts: 1,551
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Id sell the 4 bolt for some useful cash to somebody who thinks 4 bolts are better & than use 2 bolt...ive done it before, & will do it again
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#10 |
Weekend Warrior
Join Date: Oct 2004
Location: CT
Posts: 1,787
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not true.
plenty of trucks had 2-bolt motors....even 3/4 and 1 tons...although those are the truck you would most likely find a 4-bolt in. 2-bolts are good to 500hp anyway (just use MainStuds/quality fasteners)...and if you build a motor that pushing that you should be running a new GMPP block or Dart or something and has provisions for a roller cam
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#11 | |
hmm...
Join Date: Jan 2004
Location: Culver, Indiana
Posts: 1,631
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Quote:
an off topic question, do they make main girdles for chevy motors? I ask because I see them availible from everyone for olds motors, but not for chevies...I'd assume that since you can pretty much fall over a 4 bolt main block, that it's not necessary?
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#12 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
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Very interesting!! So a Myth it is seems!! I was also told they used only 4-bolts in the bigger station wagons and Suburbans.
Dave |
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#13 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
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I have a 4 bolt 4 sale!
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#14 |
Registered User
Join Date: Oct 2004
Location: DFW TX
Posts: 769
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My truck 350 is a 2 bolt.
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#15 |
Registered User
Join Date: Jul 2002
Location: SE NM
Posts: 769
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I heard that all truck V8s were 4 bolt. We know thats not true.
I have two 69 300horse 350s(one is the original motor in my 69 Camaro SS) both are Tonawanda engines, one is a 4 bolt, one is a 2. I'm guessing supply and demand determined if a vechicle got 4 or 2 bolts.
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#16 |
Registered User
![]() Join Date: Aug 2001
Location: SOMERSET KY.
Posts: 6,427
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![]() (QUOTE) most guys just go with a dart/world block if they need that much beef..and you can get them with billet steel splayed main caps (QUOTE) EXCEPT THE COST OF THEM MAKES IT IMPOSSIBLE FOR ME. FOR THE COST OF A DART BLOCK WITH SPLAYED CAPS, I CAN BUILD A COMPLETE 4 BOLT 350 FROM CARB TO PAN. ![]() ![]()
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#17 |
Registered User
Join Date: Nov 2003
Location: st. louis area
Posts: 1,551
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as far as same cost, I geuss that depends. here I can get 2 bolt 350s for little or nothin...but guys are gettin 250.00+ for 4 bolt bare blocks...so depending on what its usage was, Id rather spend the 250.00 elsewhere. Ive never busted a 2 bolt in all my years, however ,I do believe 4 bolts are crucial in heavy towing applications
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#18 |
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. ![]() LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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#19 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,737
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I asked a buddy about this who owns a machine shop and has built many 350s from stock to built. His opinion is a 4 bolt block is good for hi horse/ torque applications. He also said about 9 out of 10 stock 4 bolts will have at least one main bolt that is not even close to torque specs. (usually 2 will be loose).
And to answer the main question, trucks came with 2 or 4 bolt mains.
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#20 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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wolfthing, thats the only true way to know.
there is nothing wrong with a 2 bolt. around here they are using them in street stocks for the dirt circle. some guys are even running upwards of 600 HP on them. truth be told the main caps is not the weak point. all the extra bolts do is HELP keep the main bearing journal round under SEVERE low RPM torque load or idiot drivers side stepping the clutch.
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#21 |
This S&*! Is expensive!
Join Date: Feb 2005
Location: Mechanicsville,Va
Posts: 57
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Its always been a debate and always will be..Does anyone personally know anyone who has had a problem with strength after building a 2 bolt motor?
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#22 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
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The Chevy Performance site says 2-bolt is better than the 4-bolt for the 400 engine because of heavier bearing caps. (for what it's worth)
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