bummys_hotrod

This is my delema. I have a 78 4 bolt main 350 bored to 4.030. I am putting a 383 stroker kit in it with flat top pistons with valve indents. The heads i have are 10088113 corvette heads 163 cc, 58 cc 1.94 1.50. My question is what size cam should i use. I want a nice loop in it but i dont want to have to feather it. Any advice would be appriciated. Thanks

five7kid

iTrader: (14)

Induction?

Transmission?

Vehicle use?

ljnowell

I dont think I quite understand the question. I have had some cars with mighty radical cams and never had to feather the gas.

I think you need to provide more of the picture. As five7 said, what kind of induction, transmission, rear end gears?

bummys_hotrod

I have a 700r4 with 3.73 gears. and a holley 750 DP. This will be a street strip car. I dont have any ideas about what cam size to use. I want something loppy and powerfull.

hotrod7687

Myself along with some friends have had very good results using this cam in a 383:
http://store.summitracing.com/partde...3&autoview=sku

If its going to be a street/strip car, you dont want to go too radical with your cam. Cam duration is what causes the lopey idle that you want, but a larger duration cam will also sacrifice low end torque for power higher up in the RPM band. If you go too high in duration, you'll have a car that wont idle, will have no low end power, and will be a dog to drive on the street. If the car is going to be driven mostly on the track, then these things dont matter as the car will only see some of the lower RPM band as you take off.

My cars are street cars that occasionally see track time, so I build my motors with that in mind. My car spends more time at idle than over 3500 RPM, so I want my power band to be in the mid RPM range, specifically 2000-5000 RPM.

I've built 2 383's with this combo and had very good results:
4 bolt main 350 bored .030 w/ 400 crank
Vortec heads with crane roller rockers
Edelbrock Performer RPM manifold for vortec heads
Holley 750 w/ vaccum secondaries
Keith Black 10:1 compression pistons
Comp xtreme energy cam that I posted above

That combo makes for a very well mannered street motor with a very nice idle and a mid range power curve, and still pulls strong until 6000 RPM at the track. I havent had one on the dyno yet, but I would guess it should be somewhere in the 400 HP range.

Stekman

"Induction" also includes intake manifold.

five7kid

iTrader: (14)

Exactly.

But, primary use is the most important, as you need to build a "package". Street/strip is what I'm looking for, the rest is insignificant - like lopey idle.

The linked XE274 would be a good choice. An Edelbrock Performer RPM would be a good intake choice to go with it and what else you've said you're going to use. Hope you have good exhaust, and will be cleaning the heads up a little to handle the 383.