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Topic: GT-40P and Headers (Read 990 times) previous topic - next topic

GT-40P and Headers

I'm converting 5.0 too 5.0 HO and am using GT-40P Heads. The driver side headers are blocking the spark plugs, the passanger side is fine however. The plug ports are strater then the stock heads. Any suggestions to buy or work-arounds?

GT-40P and Headers

Reply #1 –
You'll need gt40-p specific shorties...or you can spring for a set of Mac full-length headers, they fit fine.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

GT-40P and Headers

Reply #2 –
thanks

GT-40P and Headers

Reply #3 –
Or use 90* plug boots.
It's Gumby's fault.

GT-40P and Headers

Reply #4 –
90* plug boots don't cut it most of the time, although they help.  My full-length flowtech headers wouldn't even come close to bolting up because most of the primaries had a spark plug in the way.  I was told that GT40P's will fit with stock mustang "headers" but it's pretty hairy...expect melted wires.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads