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Vehicle Info NeededAluminum Cylinder Heads Pontiac 400/455, w/Hydraulic Flat Tappet
Ships on 09/14/2026
Lowest Price GuaranteeSpeedmaster PCE281.2168 Features:
Speedmaster Pontiac heads include valve sizes at 2.11" Intake, and 1.66" While the 2.11" valves are standard issue, the valve seat can be machined to accept a larger valve with minimal work. Combustion chambers are exact in volume - so every cylinder has the same compression ratio. Each port is the same cross-section - so every cylinder can reach a higher true RPM potential.
- Recommend Felpro #10171. (4.540 Bore) or Fel Pro#1016 (4.300 Bore) head gasket
- Manufactured with the Ram Air IV pattern which requires Felpro #1233 gaskets
- Please measure for exact pushrod length once heads and rockers are fully installed. Deck machining, head gasket thickness, and rocker arm style will all affect pushrod height.
- All Speedmaster Pontiac heads use standard 14mm. x 750" reach, 5/8 hex, gasket seat sparkplugs like NGK R5671A-7, Autolite 3924, Champion RC12YC, etc. Remember that higher compression/ boost requires a colder heat range sparkplug
- Utilizes standard Ram Air Iv head bolts or studs. The ARP head bolt part number is 190-3605
- Recommend the use of Edelbrock exhaust gaskets #7281
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
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Ditch Restrivtive, Heavy Cyclinder Heads for Speedmaster Performance Heads
One of the best upgrades for your engine is to replace cast iron heads with a better performing and lighter aluminum head. Speedmaster's line of performance cylinder heads have proven themselves time and time again both on the track and on the dyno. Many variations are offered for popular Small and Big Block engines to bring performance output to the next level. Available in as-cast for mild street applications and in Fully CNC machined for the serious enthusiast.
