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By famdoc3 - 9 Years Ago
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I'm building a hotrod 1930 coupe. It of course must be a y block. I have a 1959 292 block that is already 60 over but sonics well. It wil have a 4-71 blower on a ybloke manifold. I currently have 5 sets of heads to choose from, a set of g heads, a set of 113 heads, a set of c heads, a set of ecl-b, and a set of c1te heads. I'm leaning toward the c1te heads as I am going to fit with hardened seats, new valves and as such and can do bigger valves at the same time. These heads will give me the big chambers I need to give me plenty of room for the boost. I have a good forged crank ground for scruby journals for the h beam rods. What advice can you give me about my choices? Thanks to all. MIKE
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By Cliff - 9 Years Ago
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113 for sure, when you check the compression you will find it with in reason for a supercharged engine.
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By speedpro56 - 9 Years Ago
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I would make sure whatever you use is posted. The 113s are and I believe the 471s are as well.
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By CK - 9 Years Ago
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You can check chamber volumes on mummert's site
Fordyblock.com
A 292 with Pistons flush with the deck will run at about 9:1 comp. which still leaves room for 5psi boost depending on cam.
However the 113's may flow better at 5500/6000.
But personally if you can afford it, get a set or aluminium heads which flow better and tolerate higher compression.
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By charliemccraney - 9 Years Ago
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With 113 heads, you'd be at about 8.5:1 with flat tops in a .060 over 292. Everything else the same, compression will increase with an overbore but you can fine tune the ratio slightly with the deck height or even shaving a liltle off of the pistons, if you didn't want to splurge for custom pistons.
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By famdoc3 - 9 Years Ago
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Thanks to those who took the time to contribute I appreciate the collective wisdom of this group. MIKE
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