THEY FIT 289,302,351W,408AND 427
5.0L MUSTANG ALUMINUM HEADS BY PRO COMP
MAN#P3037
GT40 EFI &CARB


ANY INFO IS APPRIECIATED THANKS

 

I have friends who have used them...with mixed results. One friend had great results, but he did the final assembly and porting, etc. Another buddy had nothing but trouble. He used them out of the box, and nothing worked right. He ended up having to pull them and have them re-machined and assembled. It seems that the saved cost up front is offset by the need to disassemble, machine, and reassemble. I'd bite the bullet, spend a little extra, and get AFR heads.

 

Get bare castings and go from there. The castings are pretty good but their complete heads just come with junk valve train.

 

I've got a set of them, from an ebay seller for $550 shipped. The quality seems really good and from what I can tell the machining is up to par. I think they get the bare castings in and machine them in house. My plans are to take them apart and fully inspect them before using but now I've got a couple of 460's to play with so... Some day.

The hardware on them is only good for stock-ish cams on the 5.0 mustang; so something like the E-303 or similar. Anything more needs spring upgrades at a minimum. I think that's where some of the issues come from. I've also seen where different sellers have different levels and standards of machining. There are some of those heads out there with crappy valve jobs that actually flow worse than stock heads.

Here's the guy I got mine from Ford 289 302 351W 408 427 5 0 Mustang Aluminum Heads GT40 EFI Carburetor | eBay

It's easy to say just get AFR heads, but they're 3 times the cost. Like I said the machining looks great on these particular ones. Even if I have to replace the valves/springs I'm still ahead. The AFR heads will probably outperform them but for a truck engine I doubt that matters.