I talked to Comp today and got these recomendations, What do you think?
First, my old combo:
383 gen1 sbc 8.0 comp.
Forged internals
23 deg TFS 195 heads- no work done
Comp XE 224/236 "high lift" with 116* lsa
1.52 roller rockers
1.75" headers, 3" dual ex. system
Motown Single plane intake-converted to efi
Big injectors, fuel sys etc.
Procharger, D1SC (19psi) with air to water intercooler.

New combo is the same exept:
8.7 compression
220-230cc alum heads cnc ported over 300 cfm past .600 lift (looking at several brands)
Vortech Ysi (more boost)
This is a street/strip car, not a daily driver, but I don't own a trailer either!
Car has a th400, 3500 stall, 9" 3.70 gear and 28" tire
Comp suggested the following cams, What do you guys think?

Hyd roller-CS3318/3319HR114+4
248/254 dur @ .050" lift
.600/.619 lift w/1.6 rocker
ground with a 114* LSA
OR
Solid roller-CS4368/4373SR114
248/258 dur @ .050 lift
.633/.633 lift w/1.6 rocker
ground wth a 114* LSA
Thanks, Steve

 

Solid roller-CS4368/4373SR114
248/258 dur @ .050 lift
.633/.633 lift w/1.6 rocker
ground wth a 114* LSA
Thanks, Steve
i chose this cam cause i like solids and i did not like the
hydr roller w/114+4 my friend has a similar cam with a ys trim vortec and it sux
he will be changing it soon..

 

What, may I ask, is your setup. How is maint. and what lifters do you use (endur-x?).
Thanks, Steve

 

I wouldnt do a solid lifter set up on street car. As much improved as solids are, they still have a pretty high failure rate on street driven cars where they see alot of low RPM time ( Normal Street Driving )

That said, I think both of them cams are kind of HUGE for anything that is driven on the street. Talk to a custom cam grinder.

 

Should I stay with my current cam?

 

Do you want a HR or a SR? Talking to Comp for advice on a cam for a blower car is not a very useful exercise. I am unconvinced about solid rollers for the street and would advise sticking with an HR cam. I don't think either cam has enough split between the intake and exahust. Your current cam is good, I believe I was the person who popularized it, at least on this board. But it is small for a setup that looks heavily like a strip car. It will make peak power about 6,200rpm. You need about 15 degrees or so more intake duration and at least 12-15 degrees more than that on the exhaust side than your current cam.

Rich

 

I'm just wondering if I can find a spring that can control a bigger HR, where it wants to reach it "potential" (under boost). My current springs (comp 914's) measured closer to 190lb seat, than the advertised 165lb. I talked to a "renegade" racer who says they do it two ways-collapse the lifter, or run well over 200lb seat pressure.
How about a 242/254 @.050, 114lsa HR?
I do like the idea of "no" maint. vs. periodic lashing, not to mention the issues with low speed oiling, extra heat and extreme pressures related to a SR.
The problem I am having is, I'm no expert (like most), so I have to rely on cam manufacturers who ALL differ in their approach to cam timing.
Any thoughts?

 

If you really want detailed advice, it's difficult. Someone who is speccing out a really specific parts combo will want to specify all the parts. Spring pressure on the seat is an issue. With a HR and you are probably going to need Ti retainers, and so on in terms of supporting components. The specifics of the lobe design, more than the simple duration numbers, are going to determine what other parts are needed, it they can work together, and so on. So, I can't say anything about if the particular parts are going to cooperate or not. But in terms of duration and LSA, you are where I would want to be. It is probably worth the extra $1-150 to have someone work out the details with you.

Rich

 

Any suggestions on a "cam designer". Someone mentioned Job Spetter @ Turbo people?
Thanks for the help

 

There is low tolerance here for unauthorized "advertsing", so I will send you a PM.

Rich

 

How much is it going to be driven on the street ? If its primarily a street car, I'd go smaller than Rich said. If its more of a strip car than street, id go with something along the lines of what he is suggesting.

 

Thanks for the replies.
For now I think I'm going to stay with my TFS heads, and just go with a larger HR cam along with the YSi I ordered today. This will be much easier (cheaper), as I can re-use my existing parts.
Thanks again, Steve

 

Get a custom grind though, cause with a blower, low lift numbers/early valve events are critical.

 

I placed an order with Cam Motion today. I am very impessed with them. I don't know if this is going to be the "best" cam possible, but at least he told me theories behind his decision, and they made sense.
Here are the specs: 296/301 adv. dur., 241/246 dur. @ .050, .565/.562 lift w/1.52 rocker ground with a 114* lsa.
He chose the lsa, and short duration split, based on my intercooler and full exhaust system.
Thanks, Steve

 

Around the duration you will likely want for the intake, but I think it needs more split ( More exhaust duration)