GT-40 head swap
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Elder User
Joined: Aug 2002
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From: CA
GT-40 head swap
GT-40 or GT-40P heads on an older (1971) 302! No problems here right? It's just a bolt on...no special bolts or manifolds or anything else needed right?
I've bolted a lot of older heads on older small blocks, but nothing newer like this.
Thanks for any answers!
I've bolted a lot of older heads on older small blocks, but nothing newer like this.
Thanks for any answers!
Laughing Gas
Joined: Apr 2001
Posts: 1,024
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From: Elon, NC
GT-40 head swap
Should be a straight bolt on. There are header issues with the GT-40p's though. Stock manifolds from the engine that the heads came from (Explorers) will take care of that for you.
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Elder User
Joined: Aug 2002
Posts: 662
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From: CA
GT-40 head swap
Thanks for the info Ron,
I've read on some websites that several of the full size long-tube headers, particularly those by Hedman, will clear the plugs. Do you know the quality (performance wise) of the stock Explorer headers?
I'm thinking of the GT-40P heads for a sore of "No-Budget" buildup, only because I hear that the exhaust side of the P heads flows a tad better then the original GT's, even though the exhaust valve of the P heads is actually a tad smaller!
I'm trying to up the performance of the older 302 in my truck for street/some strip use. Would it be that much simpler to just go with the original GT-40's and skip the header hassle? I originally planned to adapt a set of Cleveland 2bbl heads, but considering all the necessary changes (water passage mods, manifold spacers or special manifold, pistons, push rods, etc.) the GT-40P's looked like a lot less of a headache. I have heard that the E7TE's have some credit as well.
And by the way, I hear that even if you use flat top pistons with the GT-40's, you need valve reliefs in them. It's always been my understanding that all early 302 flat top pistons had valve reliefs. True?
Any further advice? Polkat.
I've read on some websites that several of the full size long-tube headers, particularly those by Hedman, will clear the plugs. Do you know the quality (performance wise) of the stock Explorer headers?
I'm thinking of the GT-40P heads for a sore of "No-Budget" buildup, only because I hear that the exhaust side of the P heads flows a tad better then the original GT's, even though the exhaust valve of the P heads is actually a tad smaller!
I'm trying to up the performance of the older 302 in my truck for street/some strip use. Would it be that much simpler to just go with the original GT-40's and skip the header hassle? I originally planned to adapt a set of Cleveland 2bbl heads, but considering all the necessary changes (water passage mods, manifold spacers or special manifold, pistons, push rods, etc.) the GT-40P's looked like a lot less of a headache. I have heard that the E7TE's have some credit as well.
And by the way, I hear that even if you use flat top pistons with the GT-40's, you need valve reliefs in them. It's always been my understanding that all early 302 flat top pistons had valve reliefs. True?
Any further advice? Polkat.
Last edited by Polkat; Apr 3, 2003 at 07:01 PM.
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