96LT14u2Nv

alright, i know these are prolly a little stupid but i am a little confused.

i am going to build a 377 b/c i have a block that doesnt need to be bored, just needs honed. so.....i have a 383 crank (3.750 stroke) and i am going to use stock 5.7 LT1 rod)s. now the ? is.......do i buy pistons for a 350 (3.480) or for a 383 (3.750)? what balacer do i need?

also, the crank is internally balaced. what else do i need to do? i plan on getting all the rods/pistons/crank balanced and blueprinted together, is that all that needs to be done?


also, will a stock LT1 oil pan work or do i need a 400 small block pan/or special pan to clear the extra stroke crank?

thanks and go ahead and let me know some other things i may run into

97WS6SCharged

Exactly what block and crank are you using?

If you use a 350 block and a 3.75 inch crank, you're going to displace 383 CID whether you use a 5.7" or 6" rod. To build a 377, you have to put a 350 crank (3.48" stroke) into a 400 block.

Josh-'04 GTO

Incorrect. A 377 LT1 is a 3.75" crank with 4.000" bore size. I happen to own one! Since I'm the only owner of my WS6 since new, I couldn't stand the thought of overboring a like-new block. Plus I want all the block integrity I can get with over 650 fwhp.

96LT14u2Nv-You need to buy pistons for a 3.75" stroke with 5.7 rods (383 pistons). They are off-the-shelf common. The only difference is you need to buy standard bore ones, not .030" oversized (remember 4.000" bore).

I found with my stock oil pan that it had to be "clearanced". This usually means a little "massaging" with a ball pean hammer. I plan on getting a different oil pan this spring, but the stocker has worked fine for 2 years.

96LT14u2Nv

thanks Josh, that is what i figured but just wanted to double check. BTW, what balancer are u using? thanks, dj

Josh-'04 GTO

No prob.

I'm using the standard LT1 balancer. I don't turn more than 6400 rpms so things have been fine so far. But as I get crazier with the motor, I'll probably try one of the aftermarket ones.

97WS6SCharged

You're right, sorry about that, I guess I assumed he would bore the block to make sure the cylinders were straight. My bad. Didn't have my cup of coffee when I read the original post.