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Old 04-25-2010, 03:57 AM
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454 intake & crossover & cam

Okay so I'm having bigger valves in my 820s and am going to have it milled just a tad (maybe..) Hoping to get to 8.4:1 CR but if I don't oh well. Anyways I'm going to use the magnum 270HR cam. I live in alaska and sometimes winters are a bit cold, maybe 20s to 30s and the summers go from 43-75 degrees. I see my heads have a heat crossover. Is it worth trying to use an intake man to use the cross over? Or should I block it off? What I'm wondering here is if I should get a edelbrock RPM or an edelbrock performer (uses crossover). I'm thinking that since the cams rpm range is 1700-5000 rpm that the performer might be better with its idle to 5500 RPM.

I'm thinking about going:
454 with flat tops
820s with 2.19/1.88 valves & slightly milled
magnum 270HR
Performer or maybe Performer RPM intake milled to match heads
Either 3.73 or 4.10s leaning toward 4.10s
2000-2400 rpm stall w/ th350


I'm kinda wondering about edelbrocks "rolling thunder" hydraulic roller cam. Guess its a edelbrock rpm cam thats HR.. If i used the edelbrock it would give me a higher DCR.. its quite a bit more agressive than 270. Think 270 is 215 @ .050 and edelbrock is 236/245 @ .050.. Seems a bit much for those 820s.. I'm thinkin that the 270 is more what I'm looking for but I don't wanna under cam it.. Or over...

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Old 04-25-2010, 03:01 PM
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If you drive in the winter you want the heat riser passages.

use the smaller cam with low compression.

218@.050 or less.
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Old 04-25-2010, 04:36 PM
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Well put. Thanks, the 270 is 215 @ .050 intake and exhaust so thats what I'll use. I more than likely will do winter driving. thanks
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