Pontiac Tri-power

[amckid6970]

Thanks for the info guys. I think he is using Rhodes lifters in it. the reason for the cam choice is money's tight and I had it lying around from a 455 that I have and gave it to him knowing he needed it more than I did. He has a code book that breaks down all the #s for every Pontiac V8 they made, it coded as a 360 horse 428 but had the windage tray and oil gaurds over the rockers. Those are HO only aren't they? It might be an assembly line goof. I hear it wasn't too uncommon for parts to get mixed up during assembly. Sorry I misspelled Tripower guys.

[tjs44]

670s are fine,with a tripower.REALLY better do a good calc on the CR.You should try and be around 9-9.25 for a pump gas engine.Also you might need a elect vac pump and can for the power brakes to work more than once even with Rhodes.Tom

[amckid6970]

I think the comp. ratio will be around 11 to 1. Dad doesn't really care about it being pump gas since we live close to a Muni airport. (100LL from the tanker trucks) It's still 3 something a gallon but it smells better than 93 when burnt. Now to make sure before I let him know the problems he may run into, I said it was a RA4 replacement, but it's what I think it is because of the duration. It's a Performer RPM cam. RA4 was 308/320 right? The lobe separation is the same, and as for the 670s, I thought they flowed the best of any head on the intake side and were choked off on the exahust. I probably totally goofed calling it a RA4 replacement didn't I?

[tjs44]

all 72CC hi comp heads flo about the same,with the advent of our piss gas they have lost their shine and 6X heads are the most popular these days.I think that is a clone RAIV cam and will act about the same.The CR will really wake up the engine.Tom

[amckid6970]

So he may still encounter the problems you mentioned?

[tjs44]

may,wont know untill its in and running.Tom

[amckid6970]

Okay, thank you for the tips, I'll let dad know!