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Original Message
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| The RPM ceiling depend on the cubes. |
| By Dave Shoe - 05/15/2002 6:04:10 PM; IP 12.2.11.131 |
In the case of C7 heads, a small displacement engine will flow less thru the runners than a large displacement engine at a given RPM, so I would think you'd be able to rev higher with fewer cubes. My info is only opinion, not based on direct experience.
C7 heads appear to be far more streamlined than the large runner heads, and they worked really fine at the higher revs on my three 1969-428PI engines (C8AE heads - basically the same as C7). It adds up in my mind to be a head that will make up to 400 horsepower with no problem in any engine, small or large displacement. Much beyond that, the inferences I've been reading is you've got to start porting.
If they start wheezing at 5500RPM in a 428, it'd seem logical that they'd start wheezing at 6000RPM in a 390 and 6700RPM in a 352.
The ring travel speed difference between a 428 and 390 would suggest that revving a 428 to 5500 is like revving a 390 to 5800. The stronger 390 crank may be happy to run to 6000 RPM, and would likely make only a little less horsepower than the slower-spinning 428, while sounding all the more menacing because it's got a cam designed to run in a 500RPM higher band and rear gears to compensate for the reduced torque compared to the 428.
I now agree that you've got a block with some potential there. It'll be a while before the FE forum gathers together enough data to make more formal determinations, but since a 15/64 bit won't fit anyplace, your block's cylinders are much like my 428 "A" block..
Shoe. |
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