http://ronspontiacpage.com/reference-pages/stockflowcharts.htm WebNov 13, 2024 · Cylinder head porting is a fairly simple premise – increase airflow into the combustion chamber to make more power. However, making it actually happen requires a bit of work. Improvements to airflow quality and quantity come from porting in the bowl area between the valve seat and valve guide because it is an area of restriction.
Cylinder Head Porting; Turning Air Into Power
WebJan 1, 2006 · Standard valve sizes for the KRE D-port heads are 2.11/1.66 inches-this is what our test heads have, and it's the same as Pontiac used on later factory heads. Optional are … http://www.wallaceracing.com/head1.htm the junkyard simi valley ca
Pontiac Cast Iron Cylinder Heads, Ported (Pair) - Butler Performance
WebSep 24, 2024 · The Pontiac Performer D-Port head is made from A356 aluminum alloy, and will fit all 1962-'79 Pontiac V-8 blocks with a 4.06-inch or larger bore diameter. It is available with three different size combustion chambers--65cc, 72cc or 87cc--and is cast with thicker port walls than stock Pontiac heads and molded with smaller port sizes. ... WebJan 9, 2024 · GM. In 1969, Pontiac introduced two updated versions of the Ram Air engines. The first was the Ram Air III, which was a 400 cid V-8 with big-valve D-port heads, cast iron intake, and high-flow exhaust manifolds. The Ram Air IV was a 400 cid V-8 that featured the round port heads with redesigned intake ports. WebHead flow of 310-320+ cfm from the 72cc Perormer RPM heads for a Pontiac V8. Update on the gasket match, exhaust bowl cut and blend. ... Head flow of 310-320+ cfm from the 72cc Perormer RPM heads ... the junos regular