Now obtainable in various intake port runner sizes, and three diverse chamber sizes, you can find the right fit for your application. All FLO-TEK cylinder heads and components are inspected for high quality and completely assembled in Evansville, Indiana. With the racing we do, we spin the engine up to 9.500 rpm or much more, and we needed a cylinder head that would deal with the piston speed. Aluminum also dissipates heat extremely swiftly, which may possibly or could not be an advantage, depending on what you are trying to obtain. Block and cylinder head deck heights, head gasket thickness, varying cams, rockers arms, and valve length can all affect pushrod length.
If we take the stock iron heads value at $150 (which is roughly what they’re worth) and divide it by 325.five average horsepower, you get a ridiculously low $.46/typical horsepower, which is far much less than any of the other heads—so the least expensive isn’t constantly the best selection. The impetus for the design came from, of all places, a look at the Chevrolet SB2-style cylinder head and its exceptional-flowing, contemporary combustion chamber and port design.
Normal features contain: A-356 virgin aluminum alloy, phosphorous bronze valve guides, valve seats for use with unleaded fuel, ends milled and drilled for accessories, and a straight spark-plug angle. Some will shop about for the least costly set of heads that guarantee to meet their expectations. Aluminum heads mated to cast-iron blocks call for carefully made head gaskets.
Holley Functionality Items is proud to introduce the most current addition to its line of aluminum cylinder heads for 305, 327, and 350ci little-blocks constructed up to 1986. Victor Jr. heads have 210cc intake runners and 60cc combustion chambers every single is designed for 2.05/1.60-inch valves and can be ordered bare or totally assembled with 1.55-inch diameter valve springs. Each head manufacturer and head porter has their personal recipe for combining these variables to squeeze the very best performance out of a given cylinder head. High quality head bolts or studs with hardened washers have to be employed to stop galling of the aluminum head.
With so many offerings now available, we couldn’t cover them all in one installment of Swap Meet, so this month, we will be discussing far more efficiency heads to increase the output of your modest-block-powered Ford or Mercury. You can uncover stock replacement and bolt-on tiny block Chevy heads in the big inventory on eBay. Each intake and exhaust valve seats are heat treated ductile iron and are compatible with unleaded fuels.