Randy

Thanks a lot for your kind info.

Yes so far my truck is quite standard.

Reason why I am asking is because I have receive an offer for a set of GT40 P heads with the following specifications.

FORD GT-40 "P" Hi-Flow cast iron cylinder heads (M-6049-P303) for use on 289, 302, or 351W engines. Their casting numbers are F77E-AA. This head features a much improved air flow over production GT heads. To increase the airflow, we have enlarged the valve sizes from 1.84"/1.46" to 1.90"/1.60" using NEW stainless steel undercut race-flo valves. They also feature four angle competition valve seats (30-45-60-75), and the combustion chambers machined for increased performance. The intake ports have 18% greater volume than E7TE (GT) heads.The ports measure 1.910" x 1.180" for the intakes and 1.350" x 1.100" for the exhausts. The flow numbers with the original valves are - Intake 58.0 @ .100", 121.0 @ .200", 159.0 @ .300", 186.0 @ .400", 190.0 @ .500" - Exhaust 45.0 @ .100", 88.0 @ .200", 112.0 @ .300", 125.0 @ .400", 127.0 @ .500". This is a 20-32% improvement over E7TE (GT) factory heads without the enlarged valves. The heads have been milled to reduce the chambers to approx 54 cc's. This will result in a 1/2 to 1 point in crease in compression. This package also includes positive stem seals, custom valve springs, 4130 steel retainers, and HD keepers. The springs are rated at 110 lbs @1.800" and 280 lbs @1.250" and will handle cam lifts to .600".

Also during the upgrade I will add a cam (nothing wild) and roller rockers.

What can you tell me about this heads? And about my project set up?

Regards
Ray