Hey guys I'm looking for some info on the gt40 head not the p head. I'm really just interested in what the casting numbers are for them. I see some stuff on a F1ZZ head and an F3 casting number but I can't tell which one is the gt40 head. If you know anything about the F1 head and how they compare to the E7 head that info would be great too.
Both are GT40 castings. In addition to those, there were also two others: F0JE-AA and F3JE-CA. The first has 2 vertical bars on the ends, the second has none. The three bar heads also have a "GT" cast in one corner next to the valve cover rail. These heads have larger intake & exhaust valves compared to E7TE's. And larger porting.
Well I'm really looking for information on our NHRA stock eliminator car. We are allowed to run either the E7 head or the F1 head but we can't find any information on the F1 head other than it is definately not a gt40p head. baddad457, are you saying all of the gt40 heads are larger ports than the E7 head? We were looking into the F1 head because that was what we felt but we can't find any real information on them or actually find a set to look at and see in person. Thanks for all your help
So, it looks like the F1 heat is GT40? I have some out it the garage, still attached to the engine, I'll see if any numbers are visible.
Ok I heard back from the NHRA tech department. it looks like the F1ZE-AA head is probably a gt40 head. Unfortunately we need the F1ZZ-B head is a replacement head and has the same specs as the E7 head. It looks like that casting may not be any better like we were hoping but thanks for the help guys.
F1ZZ-B is a Ford PART NUMBER. It is NOT a casting number.(actually the engineering number) The second "Z" is the giveaway here. Ford Part numbers are never found on the actual part itself, but on the packaging the part comes in. If it were to be found on the part, it would be done in paint or ink, never cast or stamped into the part
