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12363399 - Signature Series Aluminum "Oval Port" Cylinder Head
This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.
These oval port cylinder head will fit all 1965 - 1996 Mark IV and Gen V or VI 396 thorough 502 cubic inch big block Chevrolet engines. They are fully machined with semi-finished Bronze Alloy guides and semi-finished valve seats that use 2.19/1.88" valves. These high velocity "290cc intake runners enhance mid range throttle response and torque. The exhaust runner volume is 110cc., the 110cc semi open combustion chamber design will make a very streetable compression ratio. Spring DIA is 1.55", with 7/16" rocker stud holes. These accept all stock accessory brackets except Gen V where the bracket holes have been enlared to 7/16". The roller studs and exhaust bolt holes are heli-coiled for strength. Technical Notes: These heads are made from 356-T6 aluminum alloy. The 9/16" deck surface is for maximum strength and greater head gasket sealing. Designed for 3/8" push rod diameter. These heads require cylinder head bolt kit P/N 12367779. Use the following performance head gasket 1965-90 with standard bore to 4.370" use P/N 12363412, with bores of 4.47" to 4.54" use gasket P/N 12363411. The semi-finished bronze guide can be finished either 11/32" or 3/8". The interlocking hardened valve seat will accept leaded or unleaded gas. Use intake gasket P/N 12366985.
- Item Requires Shipping
- 36.1 lbs.
- W9.8000” x H7.3000” x L25.0000”
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