PONTIAC POWER RULES ! ! !


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If you know the code number, try my new head search



Chart to mill Pontiac Cylinder Heads
Chart of C.R. of Pontiac Engines and Heads
C.R. Percent Power Loss


Pontiac made closed chambered heads until 1967.In 1967 Pontiac made some open chamber heads(i.e. 061).After 1967 the heads were open chamber heads.

Exhaust Crossover Port Matchings
With HeadAnd ManifoldUse Gasket
1965-711965-711965-71
1965-711972-791972-79
1972-791972-791972-79
1972-791965-711965-71**

** Use sheet stainless steel block off plate.

In 1973 Pontiac started stamping extra numbers (1/4" tall) on their heads.These head numbers represented chamber sizes.They are usually stamped on the machined pads by the valve covers.
Head ID Location

The following are 73-74 heads

*All heads cast on or about April, 1973 received threaded studs.
 So, take the head above and if they were cast after or about April 73,
 the "pressed" applications will be "screw-in".


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5C heads were installed on engines until around mid 1975 then dropped

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The 6X castings started being installed on engines after about 2/21/75

The 6X-4 and 6X-8 were the only heads used after 1976. 

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(Let me know if you find any more information on these codes or any not listed.)

Pontiac Intake Manifold Years Interchange

  • 1957-1958
  • 1959-1960
  • 1961-1964
  • 1965-1979
  • Does not apply to 301 or the RA V





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    Year(s)Engine HP RatingHead #Valve SizeCC or CR