1bigcam

iTrader: (9)

iam in the middle of building a 383 ls1 and am looking to see what kind of power i should expect.
383 ls1 11.5-1
tsp 2.5 ls6 heads
tsp 240-244 610 612 lift on a 113 and a 111 icl
fast 102mm with 90mm tb
shorty hooker headers 2.5 exhaust with x pipe and dynomax bullets
and last thing up to a 200 shot of the good stuff lol
thanks mike

SSdreamz

iTrader: (3)

hey Lake, the numbers are in my sig, you can see on my graph that the LS6 is choking it out up top though

1bigcam

iTrader: (9)

thanks, i would like to do 450 whp na with the 4l60e

Hemi Killer

iTrader: (6)

I made 394/408 locked in 3rd gear with my cutouts open. I think my cam might be advanced +8 instead of +4 like it's supposed to be though. The guy that built the motor was supposed to have fixed it, but it peaks at 5500...

52172

iTrader: (2)

why are you running shorties?? That 383 is gonna need to breath! You got the big old intake you need the exhaust to go with it...

1bigcam

iTrader: (9)

the motor will be in a 95 miata and they dont make long tubes yet

wantsum410

iTrader: (5)

One of Tony Mamos 383'S put down 540 rwh...N/A.I am not 100% but I think it was with a set of the 205 AFR's.Somebody correct me if that is not rt. Do a search for 383 engine dyno results....Alot of good info!!!Around 9/25/05.

annil8r1983

People on here for some reason think I have no idea what I'm talking about so take it how it is. Your dynamic compression Is gonna be a little high 26-27* timing at most with about 12.7 afr. You have a decent intake for torque but it doesn't have the plenum volume to keep up with the tb and heads. That combo should peak about 6.5k. Should make atleast 480rwhp with a locked converter depending on its efficiency. The shortys will only slightly effect torque unless there smaller than 1 3/4. All in all you should be satisfied but your drivetrain will not like you!

1bigcam

iTrader: (9)

thanks for the info, driveline should hold up it has a ford 8.8 and the axles are rated at 650whp, my goal is 450 whp with the 3600 stall, i think the headers are 1-5/8 but not 100% on that

rpmauto

iTrader: (14)

I had those heads on my 402, good heads. But not enough for what I wanted. Like with all things some people make good #s others dont. At any rate that thing will scream in a little car like that.

1989GTA

"The shortys will only slightly effect torque unless there smaller than 1 3/4."

That has been my experience as well. Above peak torque there is not much to chose from. Below peak torque the long tubes have an advantage.

Honda Nick

iTrader: (1)

digging up an old thread, here are my 383 numbers. PRC 215 heads, Torquer 3 cam, FAST 90 setup, 1.75 inch headers, built RPM transmission and differential. This car is very, very easy to drive.

butler

through a 5000 stall 470 rwhp and 380 torque. turbo 350.

WKMCD

iTrader: (2)

My friend ALOHAC5 on CF made 513RHWP running a Futral cam around 239-244 in his 383. That was with AFR 205's and a 90/90 setup. Unfortunately, he just took the main and rod bearing out on that build. Fortunately, VA Speed is build him a 403.