street/strip 383 chevy cam change for more power

[SPEED MASTERS CC]

I have a 383 chevy with AFR 195 heads, 11-1-ish flat top pistons, 6 inch rods, air-gap intake with 750 carb, 3000 stall, with a cam that is single pattern .480 lift/230 dur. @ .05 on 108lsa. It runs good... I want more power.

I currently want to stay with a girly hydraulic roller cam.

The cams in consideration is a single pattern .560 lift/237 dur. @ .05 on a 108 lsa. and the Comp Cams "mutha thumpr" or "big mutha thumpr" cam.

I am open for other recommendations.

This car is mostly street. weekends strip.

Thanks in advance.

[6sally6]

I'm certainly NOT a cam "pro" but.......seeing how my SBF reacted to 230/236duration@050...."you need a bigger girly cam!" 10 more on the intake and 15 on the exhaust would not be too"snotty" for a 383.IMHO I like the idea of more exhaust duration when running mufflers. Sorta buys a little time for the spent exhaust to get out.
6sally6

[CamKing]

The cams in consideration is a single pattern .560 lift/237 dur. @ .05 on a 108 lsa. and the Comp Cams "mutha thumpr" or "big mutha thumpr" cam.

That's about as big as you'll want to go with those heads, and that stall speed.
You'll need to go with Morel lifters with that cam. It's not easy on the valvetrain.

[Orr89rocz]

Whats it do for rpm and power now? I ran a 230 deg lobe with .603" lift with LS7 lifters and it peaked at 6250 rpm putting 400 hp down to the tires. AFR 195 heads/stealth ram EFI intake, 383, 11 to 1.... etc. Most 230 deg cams in a 383 will peak 6000-6200 ish rpms and are a good match for a street strip car. You could go a tad bigger like said. I ran 3600 stall and had a blast with 3.42 gears behind a 700r4 tranny.

You'll need to go with Morel lifters with that cam. It's not easy on the valvetrain.

Which cam? The Thumper ones or the single pattern 237 he suggested?

[CamKing]

You'll need to go with Morel lifters with that cam. It's not easy on the valvetrain.

Which cam? The Thumper ones or the single pattern 237 he suggested?

Sorry, I thought that 237 was a Comp Cam.

[Orr89rocz]

Is there a general guideline you use to determine if a cam lobe will work with a certain type of lifter....as in this case, a certain hyd roller lobe can or cant work with the oem type lifters and must a better design with stronger internal valving/springs like morel?

[F-BIRD'88]

Not near enough information to give a cam change recomendation.

Like most streeters you're probabily not making full use of what you got now.
Most likely not near enough gear ratio and a tame converter.
As 90% of the gain of a cam change will show up at the top end of the power band.
The gear ratio, converter and vehicle weight etc become all the more critical to seeing a actual performance gain.

Are you willing to do the valve train up grade nessessary to run a more aggressive
cam with more lift?.

More specific vehicle info.

Do you want "more power" so you can tell your self and friends you have more power?
Or do you want to run faster and quicker down the 1/4 mile?

[SPEED MASTERS CC]

More info:

The car is 2700 lbs. 4.56 gears, 30 inch slicks. The current springs are good to.600 lift.

If I need more converter, no problem.

Thanks again!

[SPEED MASTERS CC]

I want the car to ET better.

I upgrade what ever is needed for the new combo.

Not near enough information to give a cam change recomendation.

Like most streeters you're probabily not making full use of what you got now.
Most likely not near enough gear ratio and a tame converter.
As 90% of the gain of a cam change will show up at the top end of the power band.
The gear ratio, converter and vehicle weight etc become all the more critical to seeing a actual performance gain.

Are you willing to do the valve train up grade nessessary to run a more aggressive
cam with more lift?.

More specific vehicle info.

Do you want "more power" so you can tell your self and friends you have more power?
Or do you want to run faster and quicker down the 1/4 mile?

[SPEED MASTERS CC]

I do not have actual power numbers. If I need more converter, no problem.

Whats it do for rpm and power now? I ran a 230 deg lobe with .603" lift with LS7 lifters and it peaked at 6250 rpm putting 400 hp down to the tires. AFR 195 heads/stealth ram EFI intake, 383, 11 to 1.... etc. Most 230 deg cams in a 383 will peak 6000-6200 ish rpms and are a good match for a street strip car. You could go a tad bigger like said. I ran 3600 stall and had a blast with 3.42 gears behind a 700r4 tranny.

You'll need to go with Morel lifters with that cam. It's not easy on the valvetrain.

Which cam? The Thumper ones or the single pattern 237 he suggested?

[dezza]

20 45/ 50 20
102.5/105
245/250 at 50 verry lumpy

[SPEED MASTERS CC]

What brand and what lift?

20 45/ 50 20
102.5/105
245/250 at 50 verry lumpy

[dezza]

custom grind pick your lift to the lobes they offer
cheak piston to valve at tdc
carby may need to sent for tuning to match the cam overlap

[1997bird]

These are Crane Cam lobes that I am using for my recommendation:

298/308 @.004"
242/246 @.050"
166/166 @.200"
.560"/.558" lift with 1.5 rockers
108 LSA
103 ICL