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1967chevelle454 04-01-2008 06:52 PM

292h cam gas?
 
I'm planning on using a comp cam 292h magnum cam in my 454. Can I run on 93 octane?

Blazin72 04-01-2008 07:45 PM

Quote:

Originally Posted by 1967chevelle454
I'm planning on using a comp cam 292h magnum cam in my 454. Can I run on 93 octane?

More importantly, how much compression do you have? What are the combustion chambers like in the heads?

1967chevelle454 04-02-2008 04:47 AM

re:
 
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.

Centerline 04-02-2008 10:13 AM

Quote:

Originally Posted by Blazin72
More importantly, how much compression do you have? What are the combustion chambers like in the heads?

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.

Double_v23 04-02-2008 10:19 AM

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

1967chevelle454 04-02-2008 06:37 PM

re:
 
So do you guys think I could get away with 10:1 with this cam and pump gas?

1967chevelle454 04-02-2008 08:05 PM

re:
 
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?

1967chevelle454 04-03-2008 05:27 AM

re:
 
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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