laughing here but good advice
L98 383 Stroker
Race Director
Joined: Apr 2003
Posts: 17,699
Likes: 1,667
From: moraga ca
Dam well use that cast iron block overall 500hp no problem I all ready have specs for my 1988 corvette l98 510/495ft lb torque to wheels with automatic transmission 700r4 naturally aspirated 3:73 rear if you do rear gears make sure you do the pozzy gear to
good luck MrLuper
good luck MrLuper
Instructor
Joined: Sep 2014
Posts: 237
Likes: 11
From: Houston Texas
When I bought my c4 the previous owner had the motor built, a 383 superram, 219 cam, ported heads, after beating on it at few track days and numerous autocross the crank broke on the first main journal and destroyed the block. Dissected the motor, kieth black pistons, never could identify who made the crank but I don't think it was forged. The 383 was a torque monster I would guess over 500, but I think the hp is barely over 400, maybe with modern afr heads it would have been more, just my guess. Since then I've swapped a ls3 with a 10qt racing pan, headers and exhaust but otherwise stock, not even a hot tune. It's been more power, more reliable, and more seat time with less wrenching. Just wanted to tell you what my experience was, ymmv. Have good day!
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
I haven't seen anyone on here post about the new Dart LSnext block.You can use factory oil pan,motor mounts and GM Ls heads.You can put together a 454 small block and it will bolt right in.
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Instructor
Joined: May 2011
Posts: 164
Likes: 0
From: Bucks County Pa
The block has 2 bolt Mains. As for 500 hp on that L98, well there wont be much of an L98 left so if youre looking for that much power might as well start fresh and get everything new incl. block. You could use your block, have it ckecked, machined, you can drill the caps and add bolts for more stength. Would be nice, wont be easy or cheap. Good Luck 
5th Gear
Joined: May 2020
Posts: 5
Likes: 0
Hey guys I have a 91 350 TPI, I want to do a 383 build to get some decent horsepower, around the 300+hp mark, I'm working with about $2,500-$3,500, does anyone have any dyno tested suggestions? Any blueprints you can spare or know of any place I can get some from? Thank you.
