84-85 Block questions

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Mar 5, 2005 | 09:48 PM

srsjuju

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Melting Slicks

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From: Wood Dale Il.

84-85 Block questions

Do any of you guys know if an 84-85 Vette should have a 2 bolt main or a 4 bolt main.

Thanks

Mar 5, 2005 | 09:50 PM

Frizlefrak

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From: El Paso Texas

It will be a 2 bolt block

Mar 5, 2005 | 09:55 PM

Rich & Lisa_84

Melting Slicks

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From: I live at www.domesticlugnuts.com I sleep in PA

Quote:

Originally Posted by Frizlefrak

It will be a 2 bolt block

Mar 6, 2005 | 01:14 AM

CentralCoaster

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

My 85 is 2-bolt.

It's been said that the non-splayed 4-bolt mains are weaker than the 2-bolt.

Mar 6, 2005 | 01:27 AM

eguyett1985

Burning Brakes

Joined: Feb 2002

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From: Fresno CA

Yeah, it is factory 2-bolt main. The 4-bolt main blocks in those years with 2pc rear main seal and passenger side dipsticks came in 1ton trucks only as far as I know.

Mar 6, 2005 | 01:22 PM

CFI-EFI

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From: The Top of Utah

Quote:

Originally Posted by CentralCoaster

My 85 is 2-bolt.

It's been said that the non-splayed 4-bolt mains are weaker than the 2-bolt.

That only applies to the 400 CID, 4.125" bore blocks. Chevy never had any splayed 4 bolt production blocks in any size. Except for the 400, 4 bolt blocks are preferable. All L83 and L98, C4 blocks are 2 bolt mains.

RACE ON!!!

Mar 6, 2005 | 01:59 PM

CentralCoaster

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

Thanks for the info CFI.

I was aware chebby didn't do any splayed holes, but didn't know what engines the parallel holes applied to.

Makes sense with the larger bore size.

Mar 6, 2005 | 02:25 PM

CFI-EFI

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From: The Top of Utah

I am only aware of the 4.00" bore, 302, 327, and 350 CID and the 4.125" bore, 400 CID as the only Gen I engines available with 4 bolt mains. All had parallel bolts. The 4 bolt 400 is the weak sister. Otherwise 4 bolt mains are desirable.

RACE ON!!!