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12 Δεκ 2018 · Standard Gen-I small-block Chevy heads position the valves at a 23-degree angle to the deck. In 1989, Chevy introduced the 18-degree Bow Tie aluminum head that shifted the valve-angle vertically, while simultaneously raising the intake port to take advantage of this angle.
8 Ιουν 2021 · Learn how to identify Chevy cylinder heads on your early cast iron, late model aluminum, or aftermarket and Vortec Chevy Small Block (SBC) with our Chevy cylinder head identification guide.
Small Block Chevy Cylinder Head Identification. 1971-75: 330545 307,350 1.72 1.5001 74 1971-73: 330862
Use these casting numbers to identify the heads you have. Small Block Casting numbers
Chevrolet Small Block Head Casting Numbers. Aluminum, LT5, ZR1, DOHC, 32-Valve, drivers Side. This casting # has been used in many different versions of this aluminum 18′ and 15′ Bowtie race head. Different chamber volumes, port volumes, port locations, valve sizes, etc. were used.
The Complete Cylinder Head Guide for Chevy Small Block Engines. A factor more influential toward successful high-performance engine building than any other is the cylinder heads. Without adequate airflow, the engine will never make power.
15 Ιουλ 2014 · Head Casting Numbers: Chevrolet Small Block Engines. Pontiac 15 degree heads, aluminum, 224cc ports. LT5, ZR-1, DOHC 32-valve, aluminum. Gen. 2 LT4, Reverse flow, 195cc intake, angle plug. Vortec 5700, L31, 170cc intake ports.
