Would this cam work?

[4.3_vortec]

I was wondering how well this cam would work with TBI and tunability. I have two actually.

First: Edelbrock Performer RPM (Hyd. Flat Tappet)

Lobe Seperation: 112
Dur. @ .050": 234 int./ 244 exh.
Lift w/1.6 rocker: .520 int./ .544 exh.

Second: Doug Herbert Hyd. Roller

Lobe Seperation: 112
Dur. @ .050": 224 int./234 exh.
Lift w/ 1.6 rocker: .535 int./.535 xh.

would these cams be able to work with tuning or what? what makes it computer compatible or not?

[GreaseDog]

Edelbrock cams are outdated junk.

[383 silverado]

I was wondering how well this cam would work with TBI and tunability. I have two actually.

First: Edelbrock Performer RPM (Hyd. Flat Tappet)

Lobe Seperation: 112
Dur. @ .050": 234 int./ 244 exh.
Lift w/1.6 rocker: .520 int./ .544 exh.

Second: Doug Herbert Hyd. Roller

Lobe Seperation: 112
Dur. @ .050": 224 int./234 exh.
Lift w/ 1.6 rocker: .535 int./.535 xh.

would these cams be able to work with tuning or what? what makes it computer compatible or not?


both are way too much cam for a 4.3 vortec. they are even too much for a 383 vortec with the stock poppet injectors.

[4.3_vortec]

It for a 355 or 383, sorry i forgot to mention that. what makes it to big? Hot Rod Mag did a 383 that made 500 hp its not TBI but still. The cam they used was a Comp CAms Mechanical Flat tappet, Lobe Seperation 106*, Dur. @.050: 260 int./268 exh., Lift w/1.6 rocker: .592 int./.609 exh. thats huge. The cam i want isnt that big, what will make it work?

[383 silverado]

they are even to much for a 383 vortec with the stock poppet injectors.

the stock vortec injectors will only support 400 hp max and a tbi less than that.

[4.3_vortec]

is that even with the 85# injectors for the tbi? because i would like to make some good horsepower without a power adder. but i will add one later on when i get the engine done and running right.

[383 silverado]

from what understand about tbi they max out around 350 hp.

[chevyz71man]

TBI does not max at 350 horse. fast305 put down 369 at the rear with tbi. You just need the right set up. It can easily support 450-500 horse. But the cams you mention are a bit radical. I am running a 112* lop sep 230 duration at .50 and 480" lift. Although it is tunable I do not make much vacuum to make the resolution better for the tune. I would not go anything less then 112* lop seperation, just wont work I do not think. Also a 230 duration is about the max.

I run 25psi through 65pph injectors and have no fueling issues. Fast runs something like 30psi through 55pph I believe, don't quote me on that.

You might be able to run that cam however with the 7427 ecm with a MAF conversion like fast runs. That gets you away from the vacuum issues of speed density.

[4.3_vortec]

What is the 7427 ecm?

[chevyz71man]

Thats the computer from a 94 with a auto tranny.

[4.3_vortec]

383 Silverado, what cam are you using?