dyno

[trex1270]

I had my 69 camaro on the chassis dyno yesterday...383 big mutha thumper cam, pro action 180 heads, rpm air gap with a demon 750 and 10.5 compression made 341 at rear tires, 353 torque....thinking I need better heads, maybe afr 195? Base line was 326, a couple jet changes to get it not so rich..oh yeah, running a five speed...

[Fast01]

What was the torque numbers? With those small runners it should be making a ton. It'll run out of breath real fast though.

The heads are small for a 383. The AFR 195's would be better (that's what I have on my 388), but you should really be running something in the 200 and up range. Just keep in mind that dyno numbers don't mean a whole lot by themselves. How the car actually performs is what's important.

[MonzaRacer]

Well I disagree, the 180s will support nearly 500hp if prepped right/teamed up with proper cam,BUT if you use too much duration you going to kill the bottom end.
First of all, running an air flow program using the head flow profile then tailoring you wants over buying a "big mutha thumper cam". This is difference over buying what is in a book or joe blow ran in his.
If you want to run a 383 at 7000 and try for big hp numbers, then yeah go for bigger heads.
So as for your combo (383/ AFR 180 heads)and no other specs I would say your actually making a good(allowing on the high side) 450 to 475 lb ft of peak torque, a literal stump puller for certain heads. And I would say 400-450 hp easy.
Now this is an awesome engine IF the torque is broad and flat, if its peaky and such, well your not gonna be happy.
Too many people will try for a bazillion hp/torque at 7000 rpm, and this will not get you moving.
Probably one of the smallest cammed 355s I ever built had a set of GM 991 truck heads, used to be factory 1.74 intakes, I opened them up to 1.94s simple pocket porting, TINY heads, older Edelbrock Scorpion intake, 600 Carter AFB.
That engine was TIGHT, it was pure torque! It would pull HARD from idle to 6000rpm and not stop. Heck it just kept pulling, I put a 780 Holley on it later on and it even got better.
Ill bet if you have proper torque converter/gearing that car pulls like a freight train, and unless your traction limited (ie spinning a lot) I would say your car is pretty tough in an acceleration contest.
So what does the butt dyno say, is it lazy , no pick up and such? Or does it run like raped ape?
Too many people give up a lot just to say they have bigger.
would I have ran a set of 180s on a 383, maybe depending on application but would have went , in certain cases, with the 100% race porting.
Get some flow numbers for the heads, post up your complete combo, with complete cam specs, and lets run it through air flow calculator.
Honestly I think your numbers look pretty good depending. If you want big numbers ,call AFR, tell them what you want and your base engine (ie pistons,rods,crank)then ask them for what heads they recommend and ask if they have suggestions on selection to match your heads, also call Comp, Cam Motion, Crane (yes they are back in business now owned by S&S), and take that info but I bet bigger numbers may not pull as hard as your combo does now on the bottom end.
Lee Abel
AFTERMARKET PERFORMANCE

[trex1270]

My engine has pretty good torque...353.61 at rear tires at 3600 rpm. torque is at least 350 from 3100 rpm until 4500 rpm and from 4500 rpm until it falls to 275 at 6100..if I had a scanner I would post it....I am pretty pleased with the way it feels. The car holds the tires well, it is mini tubbed with 315/35/17 on the rear. I run a 5 speed manual transmission. 10.41 is my actual compression running an eagle bottom end kit. If I had to choose another camshaft, would I pick the big mutha thumper? I doubt it. Since I installed that cam, I have decided that I would like fuel injection and my engine only has 6.5" of vacuum at idle....I will probably start saving my pennies and install an lsx motor in a couple years....

[alnoe]

TRex

You may also want to consider one of our TFS heads:
http://www.trickflow.com/egnsearch.a...5&autoview=sku

I had a 10.3:1 388 with our 195 heads and a 230/236@ .050 hydraulic roller, and it made very good, usable power-395 RWHP, and 385 ft/lbs.

An article on the old engine vs, the new combination I built is located:

http://www.trickflow.com/articles/triple_dog_388/

The new build I use our Super 23 CNC head with a 230 CC intake runner, and a "big" hydraulic roller. It makes good power where I want it to, and sounds nasty as heck!

I think the key to getting what you want is to first pick the cam you want, based on driving style, power you want and RPM, then pick an appropriate head. Our 195 head is nice because it flows very well, and is available with 3 chamber sizes-62, 64, and 72 cc. Killer street head for the money.

Thanks-if you need anything, you can call our tech line or PM me.

Thanks
Al