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Old 05-06-2010, 08:54 PM
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454 cam/piston

I'm looking at a 9.2:1 CR with 13.80cc pistons (haven't bought them yet).
I was told I could run the magnum 280HR cam even with the CR being 9.2:1 instead of 9.5:1 but it does give me a really really really low DCR. What about the XR282HR? What I want is the most CR and cam I can run with iron heads and 90 octane premium pump gas. I considered doing the 9.2:1 CR with some edelbrock rolling thunder hyd roller cam because my DCR would be 8:1 but I havn't heard anything about them.. I'm open to opinions.. I was told by a guy to gear the heck out of it and not worry about power but that's not how I am..

Going into a 1977 C10 pickup with TH350 and 3.73/4.10 gears (havn't decieded) maybe a 2500 rpm stall converter.

I'm building it from the ground up so I want it done "right"

I'm worried if I goto 21cc pistons that my CR will be too high, make it 9.7:1 on 90 octane fuel.

I am however not wanting to go over 5800 rpm and would feel better at 5500. I need some ideas on cam and pistons...

13.8 w/113cc heads .025 deck be 9.2:1
21 w/113cc heads .025 deck be 9.7:1

Interested in magnum 280HR, XR282HR and edelbrock's rolling thunder.

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Last edited by ekacpuc; 05-06-2010 at 09:01 PM.
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Old 05-06-2010, 11:42 PM
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I guess what I want to know is why is the mag 280HR wanting a 9.5:1 CR and the XR282HR is wanting a 9:1 CR? The DCR is slightly lower on the XR282 for me (6.9:1 vs 7:1 DCR). The XR282 is something like 230/236 @ 050 and the mag 280HR is 224/224 @ 050. Just seems strange the cam with the highest DCR and the lowest dur #s is rated for a higher static CR. What one is "better"?


Last there's the rolling thunder that's got the highest DCR (8:1) with dur of 248/256 @ 050.

Think goin with 13.8cc dome pistons for 9.2:1 CR is 7:1 DCR too low?

Also with a 9.2:1 CR should I go with the mag 280HR or the XR282?

Last edited by ekacpuc; 05-07-2010 at 12:37 AM.
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Old 05-07-2010, 07:45 AM
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My experience with BBC's is they don't tolerate compression as well as a small block.

IMO, 9.5:1 with a 280HR is ideal for a BBC with 93 octane. So 9.2:1 should be ok with 90 octane.

3.73 gears should be good for a street truck with a BBC and a 280 cam and 2500 stall.

how many cc's are the heads?

I would rather be able to run full timing with then compression then to run higher compression with less timing.
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Old 05-07-2010, 07:49 AM
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And.....

I would start the 454 build using a late model 454 vortec engine with a factory roller cam.
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Old 05-07-2010, 07:54 AM
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If you go w/the OEM roller BBC, use a Gen VI, not the Gen V.
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Old 05-07-2010, 03:24 PM
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I have a mark IV block with 820 heads. I haven't had them CC'd yet but from what I've read they're 113cc chambers. I haven't gotten pistons yet either. So I'm starting to see a pattern here and its go with the 13.8 dome pistons and that 280HR and advance timing..

So you all would go with the mag 280HR instead of the XR282?

I was leaning towards the 3.73 too.
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