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Old 02-18-2004, 12:14 PM
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Chevy big block mods.

Hey there, I am new to this board...but you guys seem pretty cool and knowledgeble, so you can probably help me out.

I am thinking of rebuilding a potential 454 or 502 within the next few months, I was wondering what specific modefications and parts I should use. This would be my first build, as I am somewhat new to the engine game, but I want to do this right so that it works out to its full potential.

What sort of heads, cams, pistons, ets would be good to use to make a lot of power? Also, I can use some help with compression...I know some aspects of it but theres always more to learn. So what sort of compression ratio would be a good idea?

I plan on pairing this engine with a 4 speed muncie, or perhaps a TH400(probably the 4 speed though).

I guess the more specific you guys can be, the better...but I do appreciate all the help I can get. Also, what sort of experiences have you guys had with these engines, and what sort of horsepower should I be expecting to get.

Thanks!
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Old 02-18-2004, 01:08 PM
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If you are on a budget, I would look at either oval 781 or 049 heads. Either of these heads would work well on your motor with those heads I would go with the 454. If you have a lot of money to spend, and are planning on going with the 502, I would get a set of 305cc AFR heads with CNC ported combustion chambers. As far as a cam, I would look for something in the 240-250 @.050 duration range. A 502 with the AFR heads, and a cam that is that size with 10:1 -10.5:1 compression should make between 650 and 700 hp. If you went with a 454 and the oval 781 or 049 heads you would be looking at between 500-550 hp with a cam in the 230-240@.050 range and 9.5:1 compression.

Adam
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Old 02-18-2004, 08:36 PM
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Yeah, the way I want to do it is save up around $8,000-$10,000 and maybe buy a 70-72 Chevelle for liek 3K and invest a good amount of money into it right away to get it running strong.
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