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  #16 (permalink)  
Old 02-17-2012, 12:38 PM
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I'm running 327 bored .040" with a 292/292 cam, with .488 lift, 1.6 ratio roller tip rockers, 64cc angle plug heads, 9.25-1 compression, Holley Pro Dominator tunnel ram with twin 450 Holleys, and not a sign of a ping or detonation. There's just gotta be some other reason beyond the heads that are causing the detonation on your engine.

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  #17 (permalink)  
Old 02-17-2012, 12:50 PM
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a 327 wouldnt have as much dynamic compression as a 364.
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Old 02-17-2012, 12:52 PM
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Quote:
Originally Posted by 1971BB427
I'm running 327 bored .040" with a 292/292 cam, with .488 lift, 1.6 ratio roller tip rockers, 64cc angle plug heads, 9.25-1 compression, Holley Pro Dominator tunnel ram with twin 450 Holleys, and not a sign of a ping or detonation. There's just gotta be some other reason beyond the heads that are causing the detonation on your engine.
Yeah, I would expect your combination not to detonate, the DCR is 7.99:1. The OP's DCR is 9.07:1.
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Old 02-17-2012, 01:05 PM
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i set the total mechanical advance all in at 3000 rpm. i was suggested to use 1 light 1 medium spring. that did not do it i had to use 2 light springs to get it in at 3000. or would i just set the timing at 32-34 at 3000 rpm all in or not and change out springs until there is no ping? but it wouldnt be all in at 3000 rpm that way.
the crankshaft is an elgin aftermarket lightweight cast. the harmonic balancer is new. would they have manufactured the crank key way off a little? and im reading the timing wrong?
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Old 02-17-2012, 02:00 PM
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runn141, you need to start over from the beginning in my opinion.
It seems to me that you know little or nothing about DCR, engineering the squish, paralleling the mains, squaring the decks or other such stuff that you need to know before you begin choosing parts for a build. Also, just because the damper is new means nothing. If the -0- timing notch does not line up with the piston being at exact top dead center, then it's garbage.

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Old 02-17-2012, 02:16 PM
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Quote:
Originally Posted by runn141
a 327 wouldnt have as much dynamic compression as a 364.
It's not so much dependent on cubic inches, it's dependent on the static compression ratio, the stroke, the rod length and the closing point of the intake valve. You could have a 327 with 9.0:1 DCR and a 364 with 8.0:1 DCR, depending on the components you use.
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Old 02-17-2012, 08:36 PM
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Quote:
Originally Posted by techinspector1
It's not so much dependent on cubic inches, it's dependent on the static compression ratio, the stroke, the rod length and the closing point of the intake valve. You could have a 327 with 9.0:1 DCR and a 364 with 8.0:1 DCR, depending on the components you use.
i was comparing my particular 364 to his 327.
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Old 02-18-2012, 03:19 PM
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Quote:
Originally Posted by techinspector1
Yeah, I would expect your combination not to detonate, the DCR is 7.99:1. The OP's DCR is 9.07:1.
9.07:1. is a little high for a pump gas build a larger cam would or more exhaust lobe to bleed of some dynamic pressure.

The Vortec engines we have had on the dyno with a good fuel curve we have only needed 29 to 31 degrees total timing for peek HP
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