Editing Pontiac V8 engine (section)

===Ram Air V===
Though never factory-installed in any car, the ultimate engine of the Ram Air line of engines was the tunnel-port Ram Air V. In 1969 [[Pontiac (automobile)|Pontiac]] created four versions of the Ram Air V engine: a {{cvt|303|cuin|L|1}} short deck version for [[Sports Car Club of America|SCCA]] [[Trans-Am Series|Trans-Am]] racing, a {{cvt|366|cuin|L|1}} variant for [[NASCAR]], a {{cvt|400|cuin|L|1}} version for street use in [[Pontiac GTO|GTOs]] and [[Pontiac Firebird|Firebirds]], as well as a {{cvt|428|cuin|L|1}} adaptation for [[drag racing]].<ref name="hotrod">{{Cite web|url=http://www.hotrod.com/articles/609ci-pontiac-ram-air-v-chief-stomp-em/|title=609ci Pontiac Ram Air V - Chief Stomp 'Em|date=2014-06-04|language=en-US|access-date=2016-07-29}}</ref> The cylinder head design is similar to the [[Ford FE engine|Ford FE]] tunnel-port head used in the [[Ford GT40|GT40]] and [[Can-Am]] series racing. So large are the intake ports that the pushrods run through the center of each port via pressed-in tubes, in addition to streamlined airfoils over the tubes themselves to improve port shape, and increase flow velocity. The 303 had shorter connecting rods, smaller {{cvt|2.5|in|mm}} journals and a solid lifter version of the Ram Air IV camshaft. It adopted a {{cvt|4.125|in|mm|1}} bore with a {{cvt|2.84|in|mm|1}} stroke, shared with the standard deck 303, for a displacement of {{cvt|303.63|cuin|cc|0}}. The short deck engine weighed about {{cvt|40|lb|kg}} less than the other variants and had an 8000&nbsp;rpm redline. Pontiac's SCCA Trans-Am program was promising, with race-ready engines producing {{cvt|475|hp|0}} to {{cvt|525|hp|0}}, however the series’ General Competition Rules required the manufacturer to produce no less than 250 vehicles with the 303. Plans were made to produce Firebirds and GTOs with advertised ratings of {{cvt|355|hp|0}} and {{cvt|375|hp|0}} respectively but concerns about emissions, the response of the automobile safety lobby, and the warranty implications of a high-revving street engine led to cancellation of the program.{{Why|How were these circumstances any different than for the special 302 cu in Boss Mustang and Z/28 Camaro engines built for the exact same reason (and successfully campaigned in Trans Am) or the Plymouth Barracuda AAR/Dodge Challenger T/A, which received specially modified 340 cu in small blocks with unique triple 2-bbl "Six Pack" configurations for Trans Am class racing.|date=April 2021}} {{citation needed|date=July 2016}} T

While the exact total number of Ram Air V engines produced is not positively known, only about 25 {{cvt|303|cuin|L|1}} engines were produced and about a dozen 428s and 366s. More {{cvt|400|cuin|L|1|adj=on}} engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. Some 400s were dealer installed.<ref name="hotrod"/>

Parts for Ram Air V engines are not readily available. The cylinder heads on the 400 CID version had an intake port volume of {{cvt|290|cc|2}}, nearly twice the size of a typical standard D-port Pontiac head - and flowed in the area of {{cvt|315|cuft/min}} at {{cvt|0.8|in|mm}} valve lift; in the realm of the NASCAR-dominating [[Chrysler Hemi engine|Chrysler 426 Hemi]].{{citation needed|date=April 2021}}