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Old 01-21-2012, 09:07 AM
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454 engine build

i have a 1972 454 pick-up motor i would like to rebuild on a budget i can afford, the engine runs fine right now with the peanut heads, but i have a set of rebuilt 119 cc heads with open chambers and 2.19 intake and 1.88 valves.i put a street intake on it, and roller rockers. the camshaft i have in it as well is a crane energizer 272 with .533 advertised lift, intake and exhaust i was wondering what i should use for pistons to put me in the 10-1 compresion range,assuming the block will be ok at .030 over bore thanks jack

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Old 01-21-2012, 10:04 AM
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Quote:
Originally Posted by jacks354
i have a 1972 454 pick-up motor i would like to rebuild on a budget i can afford, the engine runs fine right now with the peanut heads, but i have a set of rebuilt 119 cc heads with open chambers and 2.19 intake and 1.88 valves.i put a street intake on it, and roller rockers. the camshaft i have in it as well is a crane energizer 272 with .533 advertised lift, intake and exhaust i was wondering what i should use for pistons to put me in the 10-1 compresion range,assuming the block will be ok at .030 over bore thanks jack
I don't see a 272 Energizer w/0.533" lift, only a 282 w/226 degrees duration @ 0.050" lift. Is that what you have, or ?
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Old 01-21-2012, 01:26 PM
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crane cam

Quote:
Originally Posted by cobalt327
I don't see a 272 Energizer w/0.533" lift, only a 282 w/226 degrees duration @ 0.050" lift. Is that what you have, or ?
that is the cam...advertised duration at 0 is 272, at 50 it is 226 duration part # crn-103072
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Old 01-21-2012, 04:37 PM
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Quote:
Originally Posted by jacks354
that is the cam...advertised duration at 0 is 272, at 50 it is 226 duration part # crn-103072
How can the advertised duration be 282 and the duration "at 0" be 272??
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Old 01-21-2012, 05:33 PM
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Quote:
Originally Posted by jacks354
that is the cam...advertised duration at 0 is 272, at 50 it is 226 duration part # crn-103072
282 advertised, 226 @0.050" tappet lift. The cam shows an LSA of 108 degrees, so the 106 is probably the intake centerline with a 110 exhaust centerline, that would make a 108 degree LSA. If you subtract the 0.050" duration from the advertised duration, you find 56 degrees, a standard ramp number that Crane has used forever.
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Old 01-21-2012, 05:52 PM
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cam discusion

i don't think i posted any question about my cam. my question was about what piston i should use to achieve 10-1 compresion ratio with the heads i am using. thanks for all your remarks about my cam though.
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Old 01-21-2012, 06:21 PM
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Quote:
Originally Posted by jacks354
that is the cam...advertised duration at 0 is 272, at 50 it is 226 duration part # crn-103072
You made this statement about your cam and you're wrong, so I wanted to correct you before a newbie reading this gets the wrong idea. Advertised duration is checked at a few different tappet lifts, but 0 is not one of them. Years ago, most of the cam makers used SAE specs J601d, which I think was 0.004" on the intake and 0.006" on the exhaust. Today, advertised could be 0.004" or 0.006" or 0.020" or
any other point the grinder wants to use. That's why the most accurate timing from one manufacturer to another can be found using 0.050" tappet lift.

As far as the correct piston to achieve ~10.2:1 with open chamber heads around 119cc's, this one will work....
http://www.kb-silvolite.com/kb_car/p...tails&P_id=117
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Old 01-21-2012, 07:11 PM
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my camshaft.....again

you are right, i am wrong about the lift and the duration of my cam....i went to my shop and found the cam card. it has advertised duration of 272...duration at 50 is 216... and the lift is 515....now could we get on with my original question?
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Old 01-21-2012, 08:55 PM
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Uhhhh, no I won't say anything.... but I just bet Ol' Tech won't be back.

Last edited by 327NUT; 01-21-2012 at 09:01 PM.
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Old 01-21-2012, 10:36 PM
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your question was already answered by one of the most respected guys in this forum, READ IT AGAIN..!!
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Old 01-21-2012, 10:52 PM
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Quote:
Originally Posted by Augusto
your question was already answered by one of the most respected guys in this forum, READ IT AGAIN..!!
I looked at the KB piston Tech suggested n he is right on!
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Old 01-22-2012, 10:18 AM
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454 engine build

i went online and checked out the kb 257 piston...looks perfect..i should have looked at my cam card before i posted...i apolagize if i offended any-one...thanks so much for the help with this piston..has any-one used this piston and head combo before? was wondering about valve clearance...us old fellas like myself don't like to put things together and take em back apart again if not needed ! thanks again for the help every-one
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