Phil'sC5vette

iTrader: (4)

OK im getting stupid again because im thinking about changing cams............

What is the largest cam I can go with without worrying about my valves tagging my pistons.

Ill be having my AFR 205s with 63cc and the GM MSL .051 gasket installed (quenched ) installed in the spring.

whats safe cam size without cutting the pistons ?

Phil'sC5vette

iTrader: (4)

wow no one ?

JZ'sTA

iTrader: (23)

I could guess but it wont be extreemly accurate.
I would say a low 230 duration cam. There is a lot that will depend on the way the cam is ground. Just a 23x/23x number wont be that accurate.
Maybe the F13????

SideStep

Phil here is a quote from Allan at Futral and a link to the post (#32)...

It looks like you can get away with a F13 (112lsa +4) and have .086"\.167" clearence. BTW I had this exact same setup and it was a stump puller for TQ!!! The only reason I fly-cut my pistons was I am using .045 Cometics and my intake clearence was less than .077".

I have been all over this subject, let me know if I can help. Getting ready to install my 4th cam in 14 months...

https://ls1tech.com/forums/showthrea...5&page=4&pp=10

Phil'sC5vette

iTrader: (4)

Thanks side,

Maybe Ill just give up a couple horses, and save a couple bucks and leave the TR224 in and see what kind of numbers I end up with after the AFRs are bolted on. My CC should be between the 62.5 and 63cc. I had .020 taken off and Ill be using the stock GM gasket.

I knew I could have bigger, but if I keep my baby cam maybe Ill have less to worry about in the long run

pdd

iTrader: (3)

Im doing the opposite phil. im going from a fm14 with flycuts to an fm6. so ill have plenty of room but with the flycuts ill have a little less compression. by the way that is my favorite color vette-magnetic red id keep the cam you have and see what the HP is, then decide

orangeapeel

iTrader: (18)

you wont have the clearance problem for sure with the 224.

bigdsz

iTrader: (1)

I've got Absolute Speed 64cc heads that were set up for a TR224. I decided to go with a Comp XER 224/228 .588/.591. Wouldn't fit I only had .045 clearance on the intakes, had to notch. A friend of mine had AFR 61cc heads, which is a .020 mill, and AFR reccommended a Comp XER 224/228 .581/.588 and that cam fit no problem. You could probably go a little bigger since your heads are not milled.

SideStep

His heads are milled, .020. Also, 61cc chambers on AFRs are a mill of approx. .030. 62cc chambers are.024. I had mine cc'd, and they are right on the money...

bigdsz

iTrader: (1)

You're right my friends AFR's were milled .024" the first time for I believe 61.5 cc. He had them milled by AFR again recently to .034" at 59cc. We put a Comp XER cam in that was a little bigger than the Trex and we had to notch I'm pretty sure .100 on the intake.

Teutonic Speedracer

iTrader: (20)

Why is the exhaust at risk on an over-rev/valve float and not the intake, being that the exhaust has a ton more clearance and the intake is the heavier valve?

Phil'sC5vette

iTrader: (4)