Editing Pontiac V8 engine (section)
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==="Pete's Picks"=== Pete McCarthy did a huge head air flow test that was originally written up in the April and June, 1991 editions of High Performance Pontiac, titled [http://forums.highperformancepontiac.com/70/9029510/the-general-discussion/to-port-or-not-to-port-heads/index.html '''The Ultimate Head: Part I''']. ;The results<nowiki>:</nowiki> *Best performance head: 1970 Ram Air IV *Best intake port: 1969-70 Ram Air V *Best exhaust port: 1968 1/2 Ram Air II *Best D-port head: No.16, No.48, No.12 (tie) *Best low compression D-port head: No.96(1971) *Best low compression post-1972 head: No. 6X *Best balanced head (exhaust to intake): 1963 421 SD *Best low-lift (under .400) head: 1967 No.670 *Worst exhaust-to-intake port ratio: 1969-70 Ram Air V *Worst intake-to exhaust ratio: 1968 1/2 Ram Air II *Biggest surprise: Intake port, No.17 350 head *Biggest disappointment: 1969-70 RA V, 1973-74 455 SD (tie) *Biggest "sleeper": 1975 No. 5C *Most under-cammed: 1963 SD, 1971 455 HO, 1973-74 455 SD (tie) *Most under-exhausted: 1964 GTO (No.9770716) *Most potential for porting: 1973-74 455 SD, 1968 1/2 RA II (tie)
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