Found this when we pulled the pan in the process of doing a rebuild. I was just wondering how common this is to find. I know that some cars came with the 4 bolt mains.

 

Believe the corvettes did.

 

It's probably a service block. A lot of F-Bodies got 4 bolt blocks when the engines were replaced under warranty.

 

 

no camaro got a 4 bold from the factory(4th gen) deffinately not the original block!, but hey, all the stronger of an engine!

 

Yea no 4th gen came with 4 bolt mains............that's good for you though.......who knows what you'll find when you pull the heads......could be some nice forged pistons in there

 

Correction - no LT1 F-Bodies came from the factory with 4 bolt blocks.

Let us not forget the LT4 cars.

 

Actually THIS is what the piston looked like.

 

actually, yes they did. some 93 and 94 received 4 bolt mains. this can be confirmed by calling tpis. www.tpis.com

sorry for replying so late, but i know that some, all be it very few, came with four bolt mains.
how am i so sure? i bought my car new, its a 94, but i bought it in november of 93, and it has 4 bolt mains, and i asked around.
not trying to start any flames or wars......

 

HA! Tahts cool. Makes me wonder about mine (not that I care enough to pull the pan). I'm gonna check and see what month it was built.