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Old 06-12-2003, 08:38 PM
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cylinder head help

well i finally got some motivation today and decided to pick up some valve cover gaskets so i could find out what kind of heads i have. the old valve cover gasket came off really easy and didn't get torn up at all so i just bolted the valve cover back down after i was done(using the old gasket) is that ok? ok now the main question, the numbers were 782461

other numbers i saw were B156 and GM 17. could anybody help me out on how good these heads are?

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Old 06-12-2003, 08:51 PM
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the 461 casting are the first "camel hump" heads, they have 160cc ports, 64cc chambers, and 1.94 1.50 valves, although some came with 2.02 1.60 valves on high performance cars. B156 indicates B - Febuary 15 - 15th 6 - 1966. These are good heads for a street machine. these heads are sought after by circle track racers who have to use factory heads.
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Old 06-12-2003, 08:55 PM
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how can i tell which size valves they came with? the guy i bought the truck off of told me they were "300 horepower heads", dont' know if that helps any.
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Old 06-12-2003, 09:33 PM
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They're probably the 1.94 heads. The 2.02s were used on the 350+ hp 327s.
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Old 06-14-2003, 07:11 AM
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I keep hearing number references to the older heads. All I remember from the 'old' days is calling heads either 202's or fuelies, which were 1 15/16 heads. We called 202's double humpers or camel backs.

My son has a set of cast 1 15/16 (1.94) heads on his 350 now. Without removing the heads, how can we tell the size of the combustion chamber? He wants to get bigger heads without effecting the comp. ratio so we will need to know the size of the comb. chamber with the heads he has now, right?

He is running 10.5:1 hyper's now, just bought a 294s comp cam and wants to match a set of larger heads with this without going up or down with the cr if possible. He now has approx. 350 hp

Doesn't he also need to consider valve clearances with that .525 lift cam, and maybe run longer pushrods along with 1.5 ratio rockers? If so, how do we determine whats what?
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Old 06-14-2003, 01:54 PM
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ztoy,If they got double hump symbols on the front,they are 64cc.
As for .525 lift,yes you better clay the pistons.Make sure your rockers are longslot 1.5s.
As for pushrods I dunno,they make pushrod length checker tools.I think as long as your block and heads aren't decked allot and you don't have a smallbase circle cam that stock length will work,but I dunno.
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