Hi,

I have bought this cam (XR288HR comp cam 110lsa) to go in my 350cui L98.
This is my current setup=L98 with iron RHS 220cc intake runners & 64cc combustion chambers, Manley stainless race valves ,K&N Intake, 7/16 1.5 steel rollers, hardened guide plates, hardened pushrods, arp head bolts, TPI setup with speed density.

Will be upgrading to LT1 intake and 24lb injectors, True roller timing set, LT headers, 3.07 or 3.43 dana 36 and 2200 stall.

I approched my local tuner and he is saying that he cannot tune my car if I fit this cam as its a 110LSA and not a 113LSA.
He is telling me I need to sell the new cam and order a 113LSA cam from jegs or summit he is stating its too hard to burn a chip and tune??
Is this correct? I see many running 110LSA cams in their C4's.

Do I ditch the cam or keep it and find a new tuner??
If anyone could help here or is running the same cam I'd like some help here.

 

Bttt

 

I would find a new tuner. Contact Alvin at PCMforless. He does my chip and he is very good at what he does. Tell him Mike Kubiak sent you.

 

Find a new tuner!

 

Ok Guys! Cheers I will find a new tuner

 

 

This is a too common issue. In fact I just posted on the LS1TECH Forum a quote from ISKY on how too many guys choose the wrong LSA when selecting a cam.

I've read many times before about how hard it is to tune a computer controller HR cam that has LSA lower/tighter than 112, so I'm not surprised that your tuner nixed the idea of even trying.

I recall that even Bryan, at PCMFORLESS, won't touch certain profiles because of his past experiences in nailing the tune.

If you check the CompCams (and probably others) catalogs, you'll see that virtually all of their computer controlled cams have 112 and wider LSAs for this reason - Customer complaints when they're not happy with the installation results.

There are still some shops that recommend and sell cams with really tight LSA cams, so I don't want to get into a discussion/debate on that.

What I can say is this: According to ISKY in an interview printed in Chevy High Performance, Mar 08, and I'm para-phrasing: A cam gound on a too tight LSA will exhibit a rougher idle but will have more low end and mid-range torque when compared to a cam with a wider LSA, which will have a smoother idle and more top end. This is with all other things being the same, like duration and valve lift.

Bottom line, if anyone can tune for it, Bryan can. Be sure to let us know how it turns out.

Jake

West Point ROCKS!

 

The thing is you cant nail down a tune over email. Even my 383 dyno tune wont run right on similar combo 383's. I have tried 2 different motors that were 383's with same heads/intake but slightly different cams although fairly large and those motors dont run right with it. Its amazing

All motors will be different, sometimes

The point is, you can tune a tight lsa cam on a factory computer. Speed density is alittle harder than MAF but can be done. Just have to know what your doing. I got my 230/245 109 lsa to run like stock just about Idled at 950-1000 but drove tame


That being said, to the original poster: Your combo is abit of a mismatch. those heads are rather large and so is the cam. Thats a 236/242 cam that will make a 383 peak in the 6200rpm range. Both are too big for TPI but will be better suited to a LT1 intake. But to put that on a 350 you must be looking to pull to 6800 rpms. It will probly want to peak near 6500rpm. Thats extremely high for a L98 bottom end

I'd run 200cc heads with that cam only if you had a stronger bottom end to handle the rpms and this was definately gonna be more of a strip/street car. Definately run more gear in the rear end. 3.43 minimal. 3.70+ optimal.
3400-3600 stall should be considered although 2800-3000 could work. I feel 2200 is way small for that 288 cam on a 350.

Run 30lb injectors atleast


I'd go to a 282HR before i'd attempt to run that 288 cam.

 

Hi Thanks for the replie's

I was going for a 3000+ stall converter and 3.73 rear end at first but it was my tuner who said I should really go for a 2200 stall. He is also suggesting a 3.07 rear end and 24llb injectors with this setup??

He was trying to change my mind on a 3.73 by saying anything higher than a 3.07 with spend most its time burning tires in first and second gear than actually putting power down!

He did agree though the heads were too high cc intake runner but he is also saying the exhaust runners the RHS 220cc heads are too small?
I want to turn this into a 383 stoker at some time in the future. Thats the only reason I went for the RHS pro topline 220cc heads.

I get the feeling the guy does not know as much as he state's! He may have the tuning equipment and tools but not the experience!
Thats why I am raising questions as I have doubt.

 

talk to alvin, my cam is close to your cam except its a solid roller, and 110 lsa. he did the tune on my car.

 

 

Just to clarify, Bryan at PCMforless does the '92 and newer LT1 computers and Alvin does the '85-'91 L98 cars. I believe you said your car was an L98 so you will want to talk to Alvin. I get my tunes from him and he is always a wealth of information. He really knows what works and what doesnt.

 

Good point. I just assumed (there I go again) he was another LT guy. Alvin's the man.

Jake

West Point ROCKS!

 

Thanks for all your help and guidance guy's. Much appreiciated