377 or 383?
Thread Starter
Instructor
Joined: Nov 2022
Posts: 133
Likes: 6
From: Dallas, TX
377 or 383?
I've been attempting some research on a 383 conversion and it would seem that I can make a 377 by using my stock 350 4.000 in bore and a 3.750 crank. I have a ridiculous amount of camshaft questions as well. What lift and duration are good for a mild street engine? Can I find a reasonably priced hydraulic roller cam/lifter set that fits the specifications? What exactly do the camshaft's lift and duration affect? What's the difference between stock rocker arms and roller rockers? What do rocker arms affect? If I'm using stock heads and an otherwise stock valvetrain (with new parts that fit the stock specs), what clearance issues do I need to worry about with pistons? How does all of this fit together? Please help!!
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
Motortrend Editorial.
Stage 1
should provide you. stroke understanding.
https://www.motortrend.com/how-to/cc...l-block-chevy/
next..
Stage 2 TPI.. 700r4.. Dana 36.. Ta do. VS not to do's.
Stage 3 computer tuning.
Stage 1
should provide you. stroke understanding.
https://www.motortrend.com/how-to/cc...l-block-chevy/
next..
Stage 2 TPI.. 700r4.. Dana 36.. Ta do. VS not to do's.
Stage 3 computer tuning.
Thread Starter
Instructor
Joined: Nov 2022
Posts: 133
Likes: 6
From: Dallas, TX
Motortrend Editorial.
Stage 1
should provide you. stroke understanding.
https://www.motortrend.com/how-to/cc...l-block-chevy/
next..
Stage 2 TPI.. 700r4.. Dana 36.. Ta do. VS not to do's.
Stage 3 computer tuning.
Stage 1
should provide you. stroke understanding.
https://www.motortrend.com/how-to/cc...l-block-chevy/
next..
Stage 2 TPI.. 700r4.. Dana 36.. Ta do. VS not to do's.
Stage 3 computer tuning.
Melting Slicks
Joined: Jul 2002
Posts: 2,223
Likes: 556
From: Tallahassee fl
Mercruiser made 377's for a while. Also called them 6.2MPI's. If you don't need to bore then IMO, don't and leave the factory bore and go 377. But if you need to bore then the options go on from there but the standard is .030 over and go 383.
I had a pair of the merc 377 Mags in my Donzi and they were smooth running great engines.
I had a pair of the merc 377 Mags in my Donzi and they were smooth running great engines.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
It really depends on the block you're using. Minimum wear you can do a 377. Cylinders are worn either different block or bore to oversize. There's a 377 by destroking a 400, but that is a different animal.
