1985 302 heads?
Laughing Gas
Joined: Jul 2001
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From: Bismarck, ND
1985 302 heads?
Adding on to the question at hand, does anyone know the valve sizes and cc of these heads? I had these questions for the same year and engine, so I figured I'd tack them on to this post. I'm considering going to GT40's or GT40P's during my rebuild, though I'm not sure how these compare to the stock heads in terms of valve size, intake runner cc, and combustion chamber cc. I'm also wondering what the stock compression would be (I'm assuming high 8's), and how swapping heads would affect it. Answers to the original E7 question and any I've added would be much appreciated. Thanks in advance!
Posting Guru
Joined: Mar 2002
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From: Boise, Idaho
1985 302 heads?
My understanding is that the E5TE heads are virtually identical to the E7TE heads.
Chamber sizes for the E5/E7 are about 64-65cc's. These are somewhat 'open chambered' heads. The GT40p head has a 'closed' chamber with a volume of about 59cc's.
I think the E5/E7 heads had 1.72" intake and 1.46" exhaust valves. The GT40p head has 1.84" intakes and 1.46" exhaust.
The ports on the GT40p heads are excellent low to mid range ports up to about .450" lift. Excellent street heads. Getting the quench down is key to unlocking the power in this head. Check the piston deck height and try for .035" of quench clearance. You may have to look around for thin head gaskets. The pistons often have a deck height of about .010" below the head gasket surface. With this deck height you'd want gaskets in the .025 to .032 range.
Late this evening, I'll do a search of head gaskets to find out what thicknesses are available.
Chamber sizes for the E5/E7 are about 64-65cc's. These are somewhat 'open chambered' heads. The GT40p head has a 'closed' chamber with a volume of about 59cc's.
I think the E5/E7 heads had 1.72" intake and 1.46" exhaust valves. The GT40p head has 1.84" intakes and 1.46" exhaust.
The ports on the GT40p heads are excellent low to mid range ports up to about .450" lift. Excellent street heads. Getting the quench down is key to unlocking the power in this head. Check the piston deck height and try for .035" of quench clearance. You may have to look around for thin head gaskets. The pistons often have a deck height of about .010" below the head gasket surface. With this deck height you'd want gaskets in the .025 to .032 range.
Late this evening, I'll do a search of head gaskets to find out what thicknesses are available.
Senior User
Joined: Jan 2001
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1985 302 heads?
The chamber volume depends on the year the head was cast. All 302 and 3561w heads cast between '76 and '85 have a chamber volume of 67.5cc. In '86 they were 62cc and in '87 they went to 60.6cc. The valve are pretty much 1.78/1.46 for all years after '76 with a few minor exceptions. These are all Ford Blueprint specs.
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Building a motor,
Approximately what thickness of head gasket should I be looking to get. I'm running the Crane H2 cam, 473 lift 284 duration.
Hotshot
Joined: May 2003
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From: south louisiana
I'm putting together a 1985 HO motor. I'm keeping the E5 heads but they were shaved 8 thousandth. The block I had decked 15 thousandth.
Approximately what thickness of head gasket should I be looking to get. I'm running the Crane H2 cam, 473 lift 284 duration.
Approximately what thickness of head gasket should I be looking to get. I'm running the Crane H2 cam, 473 lift 284 duration.
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