desi

I am planning a cam/header/intake upgrade on my 74 (currently stock L48) to the Edelbrock performer series package. I also plan on porting/polishing heads while I am at it. I am just wondering what kind of power gain I can expect from this. Is 80 HP more a good guess? Currently the motor is rated at 190 HP.
Next year, I am doing a 383 conversion. Will this package be good enough for a 383 stroker (around 350 HP planned)?

Thanks in advance.
:seeya

Ganey

Performer intake & Dynomax coated headers. The Performer cam is not enough. You need Comp Cams 260H or XE256 for your 1974 350 auto., good for about 300 w/ engine on dyno.

More cam will be needed for the 383.

Glensgages

I run a comp Cams 292H in my '79 Z28, along w/ stock 'DART II' heads, Victor Jr intake, Holley 750 dbl pump, on a 10:1 355" with 'on-sale' headers. W/ a 10" converter, 4.10 gears, and sticky tires, it went 13.60s @ 103 MPH with open exhaust. While I drove the Z on the street a bit, it is primarily raced at a local track. It idles like a REAL race car, and pulls to 6500+! The 292H was 'iffy' on the street, but may work very well in a bigger 383", like you're planning. Just my $.02 .....

gkull

For $39.95 Desk top dyno can help you map out a good plan for your project. 383's can be built and be emission legal "Sniffer" well into the 400 hp range

desi

No emissions needed for 74 cars where I live.... :cheers:

Thanks Ganey about the cam info. I got same response (in fact same parts) from the local guys here. Since you are one of the cam gurus here on the forum, I might be bugging you again later when I am about to buy.

Thanks guys.

emsrescu

i had the l48 in my car. i pulled it and went 60 over 350 with the rpm kit. heads and all and now she makes me go weeeeeeeeeee everytime i driver her. who cares about the hosepower #s as long as she can slam you back in the seat when you punch her to the floor. :D

Ryan77

I'm with Ganey also. If you will be stroking the motor to a 383, then I would recommend going with the Performer RPM package and not the regular Performer package. For a cam, since I'm guessing your car is probably automatic, a Comp Cams 262XE would be perfect. You could go bigger if you would like (I have the 268XE in my current 350 with a manual trans), but you would have to change your torque converter, if your car is has a manual trans, you can go as big as you want. I was also going to stroke my '77's 350 to a 383 until I found out about a place called called AR Racing, and now I decided to buy one of their 383's with 470hp/465tq. This engine has the aluminum Edelbrock E-Tec heads (200cc intake runners), Performer RPM intake, 4 bolt main, 10.5:1 compression, hypereutectic pistons, and with the 1.6 roller rockers, the final lift on the roller cam is about .525". You might want to consider one of these instead of rebuilding your motor to a 383. With AR Racing's 383, you get an all new motor with a ton of power all for $3,500, and save your numbers matching motor, a lot of time, and the hassle of mixing and matching parts. For me it was actually cheaper to buy the AR Racing 383 than to build my own, and it made more horsepower and torque. All you have to do is put on your choice of exhaust, a carb, and a distributor. A lot of guys here on the forum have ordered from them, and very happy with the motor. Olivier (grandsportC3) is the best example. He's running low 12's with their motor :yesnod: :cool: Add up the complete cost of building your motor, and compare it to AR's prices. You'll be surprised how much it costs to biuld your own :yesnod: . Good luck with whatever you choose :cheers: