I am switching from the p heads to tw and was wondering if the headers for the p heads will work with the tw? As far as I know the primaries are a little longer on the p spec headers where they come out of the head, is that the only diff? Thanks for any info
They will fit and work just fine. The only FRPP headers that you can buy new now are designed for the P heads and they will bolt up to stock heads, gt40s, TW and the like. The only spot where you might have a problem is if you had a set of high port Trickflow heads but since you said that you have twisted wedge heads you should be fine.
Yes. RYC CUKR is correct. You can use p headers with tw heads.
The only difference between the stock type headers and p type is the p's have more clearence for spark plugs. Other than that they bolt up the same to the head and exhaust.