dhirocz

my 382 ci. LT1 made 383RWHP and 382 RWTQ (dyno charts on page 5 in my sig)

I need to upgrade, I know I can get more out of this motor.

Right now I'm running a ZZ383 GM rotating assembly with scat forged I-beam rods, 233/239/112 comp cam, true roller chain and meziere pump, 52mm TB, LE3 heads, Hooker LT headers, custom y-pipe into a borla catback. I know I can get more from this motor...I'm not sure what exactly is holding me back, I think it's a number of things. I'm dissapointed mostly that the tq numbers weren't higher. This bothers me because I see some nice 383's making close to 440+RWHP and similar tq #'s.

pistons are the factory GM hypers, they have an 18cc dish that makes 10.3:1 compression with impy gaskets. The heads flow a max of 277/194 at .600 lift and 243/165 at .400. The cam sounds good but is slightly large giving me just a little surge under 2k while cruising, so I'm thinking of backin up to a cam around a 230/236/114, upgrading to a 58mm TB, and changing pistons to up to compression to around 11.8:1 (haven't decided, might go with boost). I'm looking for more tq and streetability mostly, but more HP is a plus. I'm not sure if the heads are causing a problem right now or not but it looks like HP is pretty much done at 5500 RPM.

I'll be swapping everything into a splayed 4 bolt main block early next year and I'm trying to make plans now, I dont have alot of $$$ to spend so I gotta spend wisely. If I get heads I want to get something that flows like mad, like a converted 18* head or a ported AFR 210, but that's last on the list of things I can afford.

If I'm gonna get 180mpg in town it's gonna be for a good reason! Suggestions?

Jameslt1TA

Something else may be wrong. I would run a data log or something and check other things before i went swapping my bank account away and still having low power. Some people also pickup alot of horse form a dyno tune.

1racerdude

If ya are talking 18* heads and intake ya better have plenty of money say 7-8 thousand and the price of a cam to go with it."O" pistons too and header's.

jerminator96

Is that cam matched to your current heads? I thought the LE3 heads were supposed to be pretty good. Raising compression is always a good way to get horse power aswell.

ejfagala

I see you had the thing on a dyno but did you do any tuning ????? I had very similar numbers and picked up 31 HP and 32 Ft Pnds with a little tuning. It is very hard to nail a tune via mail order. I feel that Ion is one of the best mail order guys around but it is not tha same as dyno tuning. If you where tunning on the dyno then I think somthing in your combo is off. I personaly would run closer to 13:1 fro WOT but thats just me 12.7:1 - 13:1 is where my motor likes to make power

Here is a link to what I picked up with the dyno tune
http://www.knology.net/~ejfagala/383DynoRun.BMP

FastZinTennessee

Sometimes dyno #'s don't mean s***. Where are your track times?

dhirocz

I dont have any track times because I can't get any traction at all...I slide most of the way down the 1/4 lol. I've been waititng to get a 12 bolt and some drag radials under there so I can try again.

NightTrain66

If changing pistons is an option, yea. . . .do that and get some compression in there. That 10.3 is KILLING you.

As far a scam selection,. . . . . . give me a call and we can definietly find some power there too.

I would consider having the intake ported if that is not done. Probably will not matter the way the car is now but with more compressiona and more cam, the ported intake will definitely help.

You can probably get in the 410-420 range by doing these things. These are GOOD #s' through a 12 bolt and using LT1 castings on a 383.

You are gonna have peak at about 6000 RPM with an LT1 casting on a 383 with a moderate hyd roller. With the right cam It will "pull" to 6500 RPM and run better by shifting around here but the HP #'s will not climb after 6000 RPM unless we get some TFS, LT4 or AFR heads with a larger cross section area at the pushrod pinch.

There are a few ways to go and make more power and the "new" game plan will have more to do with what you wanna spend. DEFINITELY put more compression in there first. Fully ported TFS heads with a ported LT4 intake and custom cam will get you some real impressive #'s. Just changing pistons and cam will possibly get yoy where you want for alot less $$$.

Just getting a dyno tune or at least some hands on tuning with Tuner cat or LT1 edit will make the car faster and more drivable but do not expect to get anywhere near 440 RWHP with that cam and compression.

Lloyd Elliott
972-617-5671
Eportworks.com

93turbo5oh

my buddies 12.0:1 396 made 436rwhp at 6100 and ran 11.30s@123 w/ a 1.7 60' at a 3600lb race weight. that was with 1 5/8" jba shorties, single 3" exhaust, 30lb injectors, and an mti h/c package with heads that flowed 255cfm.