4 bolt main question

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Mar 19, 2008 | 01:03 PM

phirepower

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From: Mass

4 bolt main question

how to tell from vin if an fbody is an original 4 bolt main car

Mar 19, 2008 | 01:36 PM

97badass

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From: Hillsboro Kansas

you cant tell from the vin number... you MIGHT be able to tell from the rpo codes or you MIGHT be able to tell by the casting number on the block... but the only way to know for sure is to drop the pan and look inside.

Mar 19, 2008 | 02:10 PM

the_merv

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From: The Beach...

You can't tell from RPO Codes in the box..it only says Engine type.
Pretty much you have to drop the Pan bro..

Mar 19, 2008 | 02:44 PM

bigbadblack93z

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From: Katy

either block would have the same casting number.
a sure bet would be a "Y" in the vin code.

Mar 19, 2008 | 05:01 PM

phirepower

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From: Mass

there is no y code in the vin, however this summer I pulled the pan and it is a 4 bolt main engine. I'm starting to wonder if this is not the original engine, it felt very strong even when it was stock

Mar 19, 2008 | 06:37 PM

engineermike

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A very few F-body's got the 4-bolt blocks and it's only because they ran out of 2-bolt blocks at the time. I have a friend who found his original block in a Formula was a 4-bolt.

Mike

Mar 19, 2008 | 07:22 PM

the_merv

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From: The Beach...

Quote:

Originally Posted by engineermike

A very few F-body's got the 4-bolt blocks and it's only because they ran out of 2-bolt blocks at the time. I have a friend who found his original block in a Formula was a 4-bolt.

Mike

Not necessarily.. if it was a Factory replacement more than likely it was a 4-Bolt.

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Mar 20, 2008 | 05:49 AM

leadfoot4

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From: Webster, NY

Quote:

Originally Posted by engineermike

A very few F-body's got the 4-bolt blocks and it's only because they ran out of 2-bolt blocks at the time. I have a friend who found his original block in a Formula was a 4-bolt.

Mike

I agree...As far as I know, only the 'Vettes got 4 bolt blocks. It's been a few years since I had the pan off my '96 Z-28, but I'm pretty sure that I saw only 2 bolts mains when I was in there....

Mar 20, 2008 | 05:59 AM

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engineermike

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Quote:

Originally Posted by phirepower

so is it a fact that a for the original engine to have been a 4 bolt main, a y would be present in vin. Is this worldly accepted as a fact

No. GM never "officially" offered the 4-bolt in the f-body, so the vin would not have been changed. Unless, of course, the vin also indicates it's a corvette.

Mike

Mar 20, 2008 | 01:53 PM

#11

phirepower

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From: Mass

I'm pretty sure my car isn't a vette lol. Hmmm any other thoughts on this issue? I bought this car from the second owner, car appeared totally stock when I first purchased it, does have four bolt mains. Anybody have a ny ties to a mid 90's gm engineer?