my father, brother and i have been arguing back and forth for months now about whether or not the F-body lt1 came factory with the 2 bolt main. they are thrown off i think because when the motor came out of my SS it had 4 bolt mains. but im assuming the motor was replaced at a dealership. is there something on the internet i could show him because hes one of those people who doesnt believe anything he reads on a forum. so please help me prove to him that the factory motor had 2 bolt mains!!

 

Read the "BLOCK" section of this article:

http://www.automotiverebuilder.com/ar/ar99928.htm

 

I pulled the original motor out of my Camaro and it had 2 bolt mains. What's the big deal anyway, I thought everyone knew this?

 

I have always heard that a few 4 bolts snuck into the fbody, but there was no pattern as to how they were put into them. Just random placement.

 

I would think that the few LT4 powered F-bodies would have 4 bolt mains, but I'd hardly consider that common.

 

F-bodies had 2-bolt mains. Vettes & GM replacement engines were 4-bolt.

I've built a lot of LT1's & never saw a factory 4-bolt in a Camaro/Firebird.

 

Didn't [b]all[\b] Corvette LT1s have 4 bolt main blocks?
Its possible the motor was swapped for a Corvette block at some time.

 

it says right in that article posted by "Injuneer" that all corvettes should be 4 bolt blocks.

 

I probably haven't opened up as many LT1's as Lonnie, but I've seen a few. The only F-Body LT1 I ever saw with 4-bolt mains was a replacement block that was bought from GM, and installed in a 30th SS convertible, that was eventually pushed to over 1,100HP.

I know my 94 had a 2-bolt block, the F-Body block I bought to build my stroker had 2-bolt mains, and I know exactly what it cost me for the Pro-Gram 4-bolt conversion.

 

Apparently my '94 had a replacement block because it had 4 bolt mains when we pulled it.

 

corvette LT1's and LT4's were the only motors with 4 bolt mains. all the other LT1's were 2 bolt

 

With the exception of replacement block LT1s.

 

thanks for the info guys!!