VR_GTS

I'm soon to be installing a set of PRC Stg 2.5 5.3's with a 224r cam and using cometic .040 gaskets. To bump the compression even more the heads are going to milled- not sure how much but Jon from Texas Speed says i will end up at approx. 11.3:1 comp. Now, as i read through the forums, some people advise against milling these heads particually if using the cometics .040 gasket for reasons given that a small cam such as the 224r does not like that much static compression.My question is 'why not'.
Vehicle details is as follows: Wieght is 2950lbs, manual,1 3/4 headers, no cats open exhaust, 98 octane fuel, 3.45 diff and the car is used for circuit racing. I,m trying to build a budget torque monster.Also, anyone want guesstimate h/p and tq #'s.

Cheers

PREDATOR-Z

The reason you have to watch your compression is because of detonnation. It is not SCR (Static Compression) that is the issue, it is DCR (dynamic compression).
224R is a XE-R lobed cam, but is it on a 112+4, 112+2, 114+4 ??

That has an effect on DCR.

Any ways, with .040 gaskets I advise no mill on 5.3L heads. That should give ~61cc and 11:1+ SCR. Perfect on all counts.

VR_GTS

Thanks for your reply PREDATOR-Z. all i asked for was an of the shelf 224r on 112 LSA. It,s not to late to change the cam if anyone has a better choice that would suit my application better.

Thanks all

PREDATOR-Z

IMO, the 228r is better suited I believe off shelf is 228/228 .588/.588 112+2 LSA
with unmilled heads and .040 gasket you are looking at ~10.8x:1 SCR and ~8.70 DCR
Perfect on fuel demands and cylinder pressures.