Hi All,

If a guy was looking for a Gen2 2, "one piece seal", 4 Bolt engine case, what is a good casting number? Or, is it like a Gen 1 and some 010 blocks are 2 bolt, some 4??

Thanks,

Cam

 

Gen 2 referring to LT1, L99 and LT4? As I recall, all L99's (4.3L) were 2 bolt. The LT1's were 'supposed' to all be 2 bolts except in Corvettes. And all LT4's were 4 bolts. Also if I remember right, the casting for all 5.7L gen 2's were the same number.

 

Yeah, sorry 1987-1992, roller lifter motors.. Pre-LS

 

Gen 1s from 87-2002 were typically 2 bolt in everything but 1 ton trucks and corvettes. Not all post 87 motors were roller. Trucks had flat tappet till 95-96 but had provisions to use roller cams.

If you're looking specifically for a 4 bolt roller cam block, your best bet is a 95-2002 1 ton van. Oddly enough that's what I used in my 92. 880 and 638 casting numbers are what you're looking for but like 010 they are a mystery till the pan is dropped.

 

10105123 casting number are available from Jegs or Summit for less than $1k. I'm going to call their tech and make sure that all machining is done, including clearancing.

Thanks!!

 

I have a 355 from a truck that has the Casting Number 10054727, says Made in Canada, doesn't have provision for Roller Cam/Roller Lifters in the valley, pulled out of a 1994 C1500 Suburban, not all have the provision. IIRC my '89 V10 Blazer didn't have the provision in it's lifter valley either. It's one of those mysterious things.. lol

 

the 87 and later blocks are still "gen 1", since the "gen" thing didn't start until they needed a way to classify the new engines that came out in the Vettes in 97, so they called them "gen 3" and retroactively named the LT1/Lt4/L99 as "gen 2"..