I still building the engine right now, looking at pistons. I have a set of open chambered 781 heads, and I'm looking at buying a set of speed pros with about a .340 dome. This should give me around 10.34:1.
This is the correct question to be asking. It's compression ratio that determines the octane you need to run more than cam timing. I ran that same cam in my pro-street 41 but I also had 9.5 compression. I used regular gas and threw in half a can of octane boost every in every tank, although I probably didn't need it. Never had any pinging that way though.
I would say with 10.34:1 you would not be able to run premium. Even if that cam bleeds off a lot of compression because of excessive overlap. You need to shoot for at the most 9.5:1
What's the street-ability and idle quality on the magnum muscle ls-6 cam? Also how do mechanical cams compare to hydraulic in reliability and maintenance?
I'm thinking I'm gonna stick with the 292h I have just because I already have it and I want to stick with hydraulic. I'm not to worried about the lifters floating because I won't be running in the higher RPM much. As you guys can probably tell I'm still a newbie when it comes to engine building, first one! Thanks for all the help. F-bird88, if I want to use your first combo with 10:1 what all do I need to buy and tell my machinist to do?
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