Quote:
Originally Posted by MOJO Catalina
The Blue one is the 535552 and the unpainted one is the 536194... I've noticed over the years that the "stock" 536194 seems to be less available than the Super Duty one, meaning I've seen fewer of them offered for sale here and on Fee-bay..
Any difference other than casting numbers?
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I don't think a heater pipe nipple is tapped in the so called SD one..Pontiac relocated the hose to the passenger side head because of a "gurgle" noise.. 
The 510 aluminum is cast with the 61 water by pass...
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ECM member.
2008 Outlaw Pontiac Drag Series Champion
MANDRA
Do it now fool! Life is short.
69 Grand Prix/3163lbs / IAII 535 w/ Tiger heads by Gaydosh....9.35@ 144 so far..  through mufflers. 1.26 60'.
Going back to track with pump gas engine....
My 60 Ventura retired to street/strip duty..
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