[jim_howard_pdx]

I will weigh in and say that the GT40P heads (explorer) are the worst waste of money known to ford racing. I hate them yesterday, I hate them today, and I will hate them tomorrow. If you are buying them because they are cheap SHAME ON YOU. Get some Dart Iron Windsor Jr heads, about 700.00 or the Windsor head at the same price. One has 170 cc intake ports the other has 190 cc ports. One has 1.97 intake valves the other has 2.02 intake valves.

I run Trick Flow Twisted Wedge Heads, and have them ported to 198 cc. They flow as well as stock LS 6 Big block chevy heads. THIS IS SAYING SOMETHING.

Awesome low end torque, and the exhaust flows 80% of the intake. This is what you expect from a Nascar type head or a ProStock type head. The water jackets are the absolute best I have ever seen on any head bolted to a ford. So good that after 5 years of blistering performance, they were so flat, I did not have to surface them.

I like the comp cams solid roller lifter roller cams. You can look their cams up on the internet. They show it all under catalog. You do not have to pay for anything custom ground, because guys comp cams has already ground them all.

With Trick Flow heads you can run up to 500 lift at 295 degrees duration without fear of hitting a thing. I am running 520 and 540 on the exhaust with plenty to spare.

You must use some clay to verify your spacing. Plus if you have hydraulic lifters, you must use a special roller lifter without a spring to check the true clearance.

Go for the highest lift you can possibly squeeze in with the head you select but keep the duration at 0.050 lift to about 225 to 230 degrees on the intake, and 235-240 on the exhaust. That will give you a great street rod engine.

Check out my thread called Please comment of my speed secret number one.