Editing Pontiac V8 engine (section)

===Ram Air (1967- mid year 1968)===
Simply called "Ram Air" by Pontiac<ref>{{Cite web|title=Directory Index: Pontiac/1967 Pontiac/1967_Pontiac_Performance_Brochure|url=http://www.oldcarbrochures.com/static/NA/Pontiac/1967%20Pontiac/1967_Pontiac_Performance_Brochure/dirindex.html|access-date=2021-11-17|website=www.oldcarbrochures.com}}</ref> it was the first in a series of engines available from Pontiac as regular production line options and officially called Ram Air. Hewing to GM's standing edict limiting engine size to 400 cu in for its midsize and smaller cars, the {{cvt|360|hp|0}} (underrated),{{Citation needed|date=December 2008}} the 400 cubic inch Ram Air V-8 was the most powerful and advanced option available in the 1967 GTO and Firebird. Its cast "670" heads had taller valve spring heights than the standard D-port heads, and the only 14-degree valve angle closed combustion chamber making these heads unique. It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". Along with the HO it also had Pontiac's famous cast-iron "headers", which were much better at reducing backpressure than the regular manifolds. The 670 heads were used until May 1967 when they were upgraded to become the "97" heads, which were then replaced late in the model year by the "997" heads which incorporated the upgrades of the "97" heads.