Hello all i just picked up a 1995 Camaro Convertible with a 383, im new to the fourm but not to F-bodys ive had a few. Im curious what kind of power this car might be making and wondering what some of your best guesses would be also what it might run in the 1/4 i dont plan on taking it any time soon

LT1 383
Pacesetter Mid length headers
Gutted cat to Flow master exhaust (Y pipe not a true dual setup)
218/228Duration .525 intake .525 exhaust Cam
Stock heads with port and polish 3 angle job .600 Lift valve springs
10.5 Compression ratio
Comp cams rocker arms
3.73 Gears
2500 Stall
Trans Go shift kit

The guy i bought the car off did not have it built the person before him did but these is the build specs that came with the car. Any input would be great. Love this car so far has alot of power and alot of fun to cruise in.

 

Welcome to camaro Z28
My uneducated guess ..... 345-365hp ???? around 90mph in the 1/8 mile ????
the only real way to find out is to take it to the track on a test and tune night

it really depends on the quality of the head work ..if the car has been properly tuned ..
Do you have any suspension upgrades ??

 

Has subframe connectors and lower control arms. At the moment its my only car so a trip to the track is gonna wait a while. I dont wanna blow up that 10bolt

 

That's a very small cam for a 383.. Definitely not seeing its true potential there. Stock LT1 compression is 10.4:1 so milling your heads and a smaller head gasket would wake it up a lot. I would say with its current setup and sticky tires with the auto you could run high 12's in the quarter mile

 

OK.....a 383ci with what appears to be a HOT cam with worked heads of unknown quality.

I'm gonna go with about 340 to 350 HP at the wheels.....so I'm in general agreement with Parker.


Agreed again.

If the heads were ported by someone who knew what he (or she ) was doing, power could be in the 360HP range. The HOT cam really isn't capable of more than that....IMHO.

KW

 

I wonder why people use mid length headers for these cars, the pacesetters full length tuck in so nice under the car, almost as if it was meant to be . But it's a damn shame to build a 383 and then not give it what it really wants, it's like giving cheese to the elephant.

 

I agree i dont understand why they used Mids. Would going to a true dual set up be worth it on this car? I did that on my 87 TPI vet and it really woke it up. A v8 muscle car with a Ypipe set up seems stupid to me but what do i know

 

Full length headers, Y-pipe and with 3" back is plenty with a nice free flow muffler. Check out 2 min into the vid how the OBX sounds on my car =). https://www.youtube.com/watch?v=11hGs0zOMiA but if I had to do it again I would of went with the OBX racing headers that were 1 3/4" stainless.

 

I dont agree with the above comment depending upon goals and other objectives. Go to the exhaust specific forums on this board and look at the sticky on good exhaust info and you will see in the first comment or post what pipe size vs horsepower level is recognized as a no loss setup. I will add this to that info as I have seen posts from the same dynos with different exhaust setups( the true dual 3" vs single 4" at a hp level that the dual appeared to be an advantage and it really wasn't. The person did say given it is an adequate exhaust for your power levels(adequate being key word and if you ever had a big exhaust restriction its like driving with the brakes on) the real difference is at the headers as you will see very little difference in the different catback designs of the same diameter. I will say I would put my true 3" dual setup with xpipe against anyones for both sound and performance. I may lose just a little on the low end because it is so free flowing but my little cam(for a built stroker) makes up for that. I did give up some ground clearance but still have 3-4" depending on how much weight is in car.


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I use mids. The slp 1 3/4' of course. Seem to make good power. Car in sig had them.

 

https://www.camaroz28.com/forums/exh...t-info-371087/ thats the link to the sticky with exhaust size vs when it begins to become a restriction


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Thanks for the great info guys much appreciated

 

One reason would be if a dyno test shows they make more HP in the RPM range the engine is designed to operate in. Buddy of mine had a set of AS&M mid (modified to dump the driver's side straight back for duals) at at the 800HP level in a high boost 383, they made 50HP more than a set of Hooker Super Comp long tubes. That was in the 5,000RPM and up range, where the engine operated most of the way down the track.

When he went over 900HP, the results were different and he changed to a different set. I picked up tthe AS&M's for $175. Still running them 13 years later, and still pumping out 800HP/800lb-ft above 5,000RPM.

Not everything is simple.

 

^^^^ I saw a lot of great reviews on the as&m mids when I was shopping. I almost bought them they were my second choice. Saw a few different dyno comparisons with them vs longtubes and they are impressive. Everyone who ran them that had any comments had good things to say. I went with the kooks stepped ones and am very happy with them but have nothing to compare to. Ive seen dyno comparisons with shorties and mids and longtubes but dont think it showed what kind of power level the motor was at(assumed it was stockish). Good info right there Fred. I am not sure but assume having to have cats may play a role in running mids.


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[QUOTE=Injuneer;6944084] Buddy of mine had a set of AS&M mid (modified to dump the driver's side straight back for duals) at at the 800HP level in a high boost 383,[QUOTE]

This was for a turbo?