ATAY383

Has anyone done a LT1 389 stroker if so can u guys give me some specs on tq and hp and is it better than a 383. Thanks.

kgkern01

iTrader: (10)

Are you referring to a 3.8" stroke 4.03 bore (a 388) or 3.8 stroke 4.04 bore (390)? I would think it would be slightly more torque than a 383 and less worry of breaking the water jacket as with a 396. That is actually what I plan on doing in a few years once I need a rebuild.

94'BLKBRD

iTrader: (76)

just stick with a 383

ATAY383

bored over 40

engineermike

Mine is 3.75 x 4.060, which makes it 388.4 cid. The only reason I did it is because my 4-bolt converted, clearanced, zero-decked, and ported block needed a bore job and was already .030 over. You'll likely never see a difference in hp and torque from the extra 5 cid. I'd say about 7 ft-lb and 5 hp.

Built LT1

iTrader: (3)

+1

There's a multitude of reasons to keep the stroke at 3.75.

Mine's currently .060 over and comes out to 388 cubes.

ATAY383

see i have to do it more than 30 cause my cam is flat and it put scratches in the cylinder walls and my friend told me to do a 389 but im just wondering if its worth doing it or will it **** up again.