Quote:
Originally Posted by Knocky
My 73 SD 455 came with 80psi pump spring. We put in the 60 for street/strip use. But, I figure the factory knew what they were doing when they went to the trouble of the 80 with the special larger distributor gear to prevent premature wear of the gear. The Super Duty used that high pressure pump overcome the centrifugal forces of the long throw crank at 6000+ when the SD's anticipated use was Stk/Super Stock racing is what I understood... Butler or Nunzi should know!
Good luck with that Pontiac! Norris
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thanks knocky.... i think that the 60lb will suffice in the 400 shorter stroke engine... i was curious if bearing clearances might be opened up a tad(loosening things up some), and then running the 80lb setup... sounds like im goin with the 60lb...
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1968 Bird/TRW 455/Home ported 13's, '70 Qjet,Holley Street Dominator manifold, Comp Solid FT, 10.817/122.30/1.440
Workin' on E/SA combo
3119 E/SA