Originally Posted by KrzyFast
TVT,
I didn't know you guys were working on cams.....Are these going to work for the SRT or just the NA versions?
Has anyone ported the heads that you know of? In looking at the factory exhaust manifold, I can't believe we only get a 8-14 rwhp bump when switching to tubular headers, unless the exhaust side of the head is a choke point as well. Thoughts?
Thanks,
KrzyFast
The cams will be NA specific, but we will do FI cams if there is enough real interest.
As for the heads, we've ported a few sets and the biggest restriction is in the exhaust port. The intake port flows really well, so well that the ratio of I/E is way off optimal due to the exhaust ports low flow.
Unequal length tubular headers do most engines no good unless the stock manifold is an extreme restriction, which in the crossfire's case it is not. Just remember that the same exact style with the same diameter tubing is used on the SC v8 engines and they flow a lot of air.
Before getting to headers, I'd have the heads pulled, 3 angle valve job, clean up the bowl, mild porting on intake side, full port with possible bigger valve on exhaust side. Do not go crazy with the intake side as it already flows a ton more air then the SC can provide.