Quote:
Originally Posted by 65 Lamnas
Both '72 HO intakes (485640 & 488945) have the higher port floor like the later SR al intakes. You can see the indentations if you flip it over. The indentations don't exist on the 69-71 oem al intakes. but the 69-71 al casting required a bit shallower floor over the iron intake for the crossover packaging....that height is probably what Cliff measured....
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I recall reading the article rocky rotella did comparing a later year SR HO intake to a 71 production one, he mentioned the change happened in 72 so all 72 production and later year SR alum intakes had the shorter plenum on the deep side, the shallow side are the same. The RA and HO prior to 72 date production were identical to the iron intakes.
Heres the article from HPP magazine if anyone wants to read it that hasnt seen it before.
https://www.motortrend.com/how-to/hp...ld-comparison/