Here goes, I've been looking for a set of iron GT-40s (not the Ps) and I am having some trouble identifying them, I have searched the forums but can't seem to come up with the answer I need. Do the GT-40s have three bars on the front w/ std. angle on the plugs, while the GT-40Ps have two bars with more angle on the plug? Any help is much appreciated, thanks... Mike
Iron GT-40s
FL_stang
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Here goes, I've been looking for a set of iron GT-40s (not the Ps) and I am having some trouble identifying them, I have searched the forums but can't seem to come up with the answer I need. Do the GT-40s have three bars on the front w/ std. angle on the plugs, while the GT-40Ps have two bars with more angle on the plug? Any help is much appreciated, thanks... Mike
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What he said. P heads will also say "GTP" on them while regular cobra or 1st gen explorer GT-40s will just say "GT".
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1,809 Posts
Correct you can find those stamped under the valve covers..
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The GT and GTP are cast into the head near the exhaust-side head bolt - clearly visible without removing the valve covers.....
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$300.00 cash money and they even came with a bent exhaust valve!
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A little steep, but not bad, now you have good reason to have some decent valves put into those suckers and do a little pocket porting.
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Insufficient piston to valve clearance. You should carefully check p to v clearance before running the heads. They have slightly bigger intake valves and (perhaps) exhaust valves than the stock e7's. If you were banging pistons with stock heads, you're likely to hit things harder with the bigger valves. And with bent valves in the Explorer heads, you should take them to a machine shop and have them gone over -- with any kind of cam at all you're gonna need to replace the springs - silly not to do a valve job and replace seals while you've got it apart. Sad part is for what you'll have in them once done, you could've gone a long way to a less-expensive set of aluminum heads.....
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His are if he has regular GT-40s yes. Ps have 1.84/1.46 but still flow better on the exhaust side.
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what is better gt40 or gt40p and what is the differance?both iron
whats the differance in reg. gt40 and the p's
whats the differance in reg. gt40 and the p's
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39,745 Posts
powersrare - both are iron; the P's are later model, have a slightly smaller exhaust valve; flow slightly better; have completely different shaped combustion chamber/spark plug angle-location resulting in slightly higher compression ratio and a more efficient burning chamber. However, with the P's -- with many aftermarket headers that aren't 'P' specific, getting some of the spark plugs in and out can require removing the header, and plug wires/boots require work to keep them from getting burned. Also, they're not set up for the HO oem air injection (smog pump fittings) or internal egr ports.
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