Hello there

I am putting together a 383 and im at a point of chosing a cam for the ap and im looking for some advice. Specs are:

383 , 3970010 4 bolt block
TRW forged flattop pistons, 10.5:1 compression
dart 200cc pro1 heads, 2.02, 1.60, no port work yet
1.5 roller rockers
Intake EFI victor JR, SD ECM
Exhaust will go to 1 5/8 headers
Converter currently stock, will change to higher stall
1987 Camaro, chunky driver
Will not be daily driver, but would have to take a 300 mile drive



target: circa 400hp/400tq , power brakes

Comp cams, suggested

12-418-8 which is ,224 230, 0.50" 0.51", 112 LSA
or even 07-305-8 which is ,220 230, 0.51" 0.51", 114 LSA
these are both hydraulic.

options: solid roller or hydraulic roller?

Any thoughts/opinions will be appreciated

Niko

 

.51??

 

you will be alot happier with a hydraulic cam in my opinoin if your plannin on drivin it much at all

 

The first one is a marine cam. The second is an LT-1 cam.

Solid roller will always net you the most power per amount of duration. Lets you use the most radical ramp rates. But yo have to get new springs and all that good stuff. Not the cheapest option. More expensive than hydraulic rollers

Hydraulic rollers are generally best for daily drivers who like a "set it and forget it" approache with valve lash. They are also quieter. The ramps arent as steep as the solid counterparts. For a good driver with 'low maintanance' this is the better of the two options.

On that note, i would look into the Xtreme Energy hydraulic roller cams that are designed for EFI applications. They have the same lobe characteristics as the 'regular' xtreme energy cams, just they are ground on a wider lobe seperation (112-114° opposed to the 110° commonly found on the 'carb' versions).

The only thing to take note about is the cam face. The cams for EFI cars are made to accept factory roller equipment. So they have that stepped nose design. You have an older block so you need the pre-86 cam face. Flat, in comparison to the stepped face.

When you upgrade the stall, what are you upgrading to? And what gears do you have out back?

 

I knew i forgot something, the rear is the 9 bolt 3.27, Don't know on the stall yet probably in the 2500 range. Where in GR are you?

 

There's all sorts of info that's been posted on this topic.
You'll get a few replies to your question, but you'll probably learn even more by doing a search.
I think you'll end up discovering that guys who don't drive their cars much except on weekends usually end up going with a larger cam than the ones you mentioned for the 383, like maybe 230-240* intake duration@050.
1 3/4" headers would be better than1 5/8" too

 

SE side, about 20 min from the airport.

You might want to consider the NX276HR. Its a roller cam with the flat face. Specs are similar to the XE276HR. Nitrous does not like valve overlap and neither do EFI setups. Just another cam to look at...