kevredz

iTrader: (2)

After the break in I managed to get to the 1/8th mile at Abilene (Alt.2612) and made 3 passes w/2.0 60' times: 8.4@88.9, 8.3@89.3, 8.2@89.6. What could be wrong? I ran a 8.1@88 w/ the stock engine and a 2.0 60'! I haven't had it Dyno&tuned yet, and I don't have the best heads. Any suggestions?

CamaroSS_2002

iTrader: (4)

Dude you are probably running wayyy rich, you need tuning bad. you probably don't have enough timing either. You could be down as much as 50hp if your car isn't tuned right

Also I wouldn't get that car anywhere near WOT until you get it tuned and A/F checked cause if not... too lean = -- and too rich = new rebuild from washed-out rings.

SNAXS

Whose heads are you running? Is your car an A4 or M6? If A4, what stall? Those times seem way to weak for a 383 kit. Get that thing tuned with some real sticky tires and a big stall, better heads, and youll see what you want to see.

kevredz

iTrader: (2)

They told me that the computer tune they did on my computer without my car being on the dyno would be close, but I guess that I will have to have it Dyno&Tuned. My car is an M6.

Camaroholic

iTrader: (1)

In your siggy, you list that the heads don't exceed 275. Are they home ported? If so, did you have all 8 cylinders flowed? If you only did one cylinder, you don't know if they are consistent across all 8. Your heads may be goofed.

I home ported a set of LT1 heads a long time ago. I had a unported chamber flowed, intake did 205 on the bench.

After a crapload of porting, I had some cylinders flowing around 230, others at 195. They all looked the same to me.

I put the heads in a box and bought a set of professionally ported heads.

-Andrew

CamaroSS_2002

iTrader: (4)

If they tuned your car while driving it around, that is better than tuning it on a dyno.

I was under the impression it was not tuned at all with new motor.

If I had to pick one major item that is causing a power loss I would say your heads. If your motor can't breath you will loose lots of power.

Nine Ball

iTrader: (38)

275cfm heads on a stroker? Those are pretty pitiful heads, and are just choking that big engine. Get the car on a Dynojet and give us some figures....

Tony

JF WS6

I agree with every one else. Heads are where the power is, especially on a larger cubed motor such as yours. I'd go with some high quality stage II or III LS6 heads on that engine. You need heads that flow in the 320cfm range or better to really see some nice results. Also, if it was me I'd go even larger on the cam.... Also, you definately need a wideband tune to make the most of it.

kevredz

iTrader: (2)

My heads were done by Mark Samford Racing Heads in Abilene,Texas. He's suppose to be the best around this area, and he did have a flow bench. The computer was sent to MTI and they just tuned it, without it being in my car.

30th TA 0219

not to flame, but why the hell would you pony up the $$ for a MTI 383, and not drop the coin on the heads. Those should have been the first thing done. Let's hope your tune hasn't done detrimental damage tou your new set-up either.

cyphur

iTrader: (10)

I'd definitely have to agree with Tony, those heads are not up to spec for your motor. As soon as you can, swap those heads out for something thats flowing better. Slap on a pair of ported LS6's, try Absolute Speed. Get that baby on the dyno and post some numbers....

kevredz

iTrader: (2)

Thanks for the help. I had them put ARP Head Studs on for that reason, because I knew I would change the heads eventually. But for now, I want the car to run right like it is and not run rich/lean or anything else that henders power resulted by lack of tuning.

Trevor @ Texas Speed & Perf.

iTrader: (3)

As everyone else mentioned, you definitely need to get the car on a dyno and tuned. We're 170 miles from you, so feel free to give us a call for some dyno time. We offer complete LS1 tuning, so we can get the car making some excellent power. I also agree with everyone on the cylinder heads. You have quite a bit of power to gain just from the heads swap! The Patriot stage II LS6-style cylinder heads are flowing 304 cfm on the intake on a 3.905" bore. That would be a 29 cfm increase at peak!

Give us a call when you have some time, and we'll be glad to get the car tuned in for you.

Trevor

Mike TexaSS

iTrader: (2)

My heads flow a Peak of 305 cfm's at 600 lift and 294 @ 550 lift.

My 382 stroker made 460 RWHP at MTI on sat. No problems here.

XFACTOR

I agree that you need to get the car on a dyno and get some heads that flow good.

B-MAN

dyno tune with LS1 edit. by the way a 346 cubic inch motor(an LS1) equivicates to a 382cubic inches when it is stroked. an LT1 was the last true 350 in our cars, those were the last of the 383 strokers.
good luck

kevredz

iTrader: (2)

Actually, my friend the engine comes out to 383 cu inches. 3.905 bore 4.00" stroke. You do the math.

MTI

E-mail me directly and I'll help you get it sorted out. Send me one of the heads and I'll flow it for you the same day we receive it and give you the true flow data as if it were flowed on that engine.

Jayson - MTI

383ss

iTrader: (14)

I have the same engine as far as bore/stroke... I get the same comment a lot