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Re: Mild 470 street / strip motor on the dyno
[Re: Hemi Allstate]
#2418230
12/13/17 11:39 PM
12/13/17 11:39 PM
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Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
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The 440 I referenced peaked before 6k, so I don’t think I’d expect more cubes with the same heads/cam combo to peak any higher.
Id say if the 6000 peak only occurred on one or two runs, it could be an anomaly during testing, or some heat soak in the manifold cost the motor some upper rpm power.
It certainly won’t hurt anything to test a few springs if you feel like you “need to know”.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Mild 470 street / strip motor on the dyno
[Re: fast68plymouth]
#2418279
12/14/17 01:07 AM
12/14/17 01:07 AM
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Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate
OP
master
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OP
master
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
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The 440 I referenced peaked before 6k, so I don’t think I’d expect more cubes with the same heads/cam combo to peak any higher. I agree the bigger engine would probably peak a little sooner. I am glad to hear this.  Id say if the 6000 peak only occurred on one or two runs, it could be an anomaly during testing, or some heat soak in the manifold cost the motor some upper rpm power. The AF ratio was more balanced left & Rt. on that pull.Would that indicate a cooler intake ? Also timing was @ 35* . It certainly won’t hurt anything to test a few springs if you feel like you “need to know”. I might check a few, just to see where I am now. Having this information to compare RPM power pk. is what I was hoping for. I think I am good to go. Thanks Dwayne , Mark
Last edited by Hemi Allstate; 12/14/17 01:09 AM.
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Re: Mild 470 street / strip motor on the dyno
[Re: Hemi Allstate]
#2418422
12/14/17 12:32 PM
12/14/17 12:32 PM
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Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
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Nice build! I have to admit, much stronger than I would have expected it to be!
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Mild 470 street / strip motor on the dyno
[Re: an8sec70cuda]
#2418553
12/14/17 05:04 PM
12/14/17 05:04 PM
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Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate
OP
master
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OP
master
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
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Nice build! I have to admit, much stronger than I would have expected it to be! Chip, it is much stronger than I thought it would be too. Now I am wondering about the rest of the driveline. Especially the trans front drum, but also the tired old 489 cone type suregrip....... Like that old saying, "Be careful what you wish for" !  Thanks ! Mark
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