RE; 7J2 400 cylinder heads - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-04-2012, 01:08 PM
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RE; 7J2 400 cylinder heads

This is my first Pontiac i have a '73 350 formula, and i have a set of 7j2 400 heads i also can get a set of 7k3 400 heads will these heads fit the '73 350 pontiac engine. down the road i will be build a 400 or 455 thank Gary

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Old 06-04-2012, 03:46 PM
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Youll need to check the clearance on the intake valve on the 7K3 as the intake is a whopping 2.11 inch compared to the 1.96 for the 7J2 heads. The top of the 1973 350 block will be chamfered to help "unshroud" the valves.I am just not sure it will provide clearance for the 2.11 size intake valves.
Mr. P Body would know for sure , at least I would bet, and he may stop by when he see's your pontiac post.
The 7K3 heads have the big valves both intake and exhaust, and a good Chamber Volume (98 CCs) and can be milled to give a real good compression ratio on a 455 . The only downside is the missing bolt holes on the end for the exhaust manifolds. You can make little brackets for that , though, o headers can be used.
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Old 06-04-2012, 04:15 PM
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Quote:
Originally Posted by athletics63
This is my first Pontiac i have a '73 350 formula, and i have a set of 7j2 400 heads i also can get a set of 7k3 400 heads will these heads fit the '73 350 pontiac engine. down the road i will be build a 400 or 455 thank Gary
Either of those heads will fit your 350, just fine. The 7J2 head has the small 1.96" intake and a 1.77" exhaust. the 7K3 has a large 2.11" intake which might be a little close to the cylinder wall. Both heads are rated at the same combustion chamber size of approximatly 96cc.

Bill
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