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  #1  
Old 10-02-2000, 12:00 AM
mopardude mopardude is offline
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Location: niagara falls ont. canada
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Question

I have a 451 stroker with 452 heads that flow 270 @ 28" light bobweight 2290 625 roller cam etc. i have had an m1 with a 850 dp on and now i have my tunnel ram on with two 750's with either intake it has done this.if the car is idleing and i mash the pedal to the floor it only goes to 6000 max but i have the limiter set at 7000 and when i had it on the sreet i was on the limiter between shits but why wont it rev to 7000 in park or N strange? the valve springs are new and i have a crane hi 6 box any suggestions?
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  #2  
Old 10-02-2000, 01:36 AM
mtrv8n mtrv8n is offline
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Ok, I'm guessing at this, but you do know that an engine has different fuel and spark requirements under load than no load, don't you? Additionally, under load internal forces are somewhat "absorbed" by the connected drivetrain. I don't recall ANY engine willing to rev as high load free as it does under load. Try this on your family sedan, you'll see the same thing. It will rev freely while you drive, but scream bloody murder if you try to redline in neutral.
P.S. Why do you want to rev it to 7 grand in neutral anyway?
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  #3  
Old 10-02-2000, 02:14 AM
mopardude mopardude is offline
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Well its not that i want it to rev to 7000 in park but my 440 with a bobweight of 2800 would rev to 7000 in park with a quick shot to the floor so i figure theres something wrong with this setup with this light bobweight it should scream! i dont get it
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Old 10-02-2000, 02:23 AM
340king 340king is offline
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It very well could be the timing. This may sound overly simple but this is what I know from much experimentation. An engine with a locked distributor sounds like it is really snotty. It will jump to 4,500 rpm instnatly with the slightest hit of the throttle. That same engine using say 12° of intial timing and the rest of say 24° coming in at around 3,000 will respond much slower, reving to only 3,000 rpm with the same hit of the throttle. If the engines had different timing curves, that could explain it.

Another possible explanation could be a cam too big for the compression ratio, leaving the engine vacuum starve
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  #5  
Old 10-04-2000, 04:12 AM
moparking moparking is offline
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Question

Where did you get the 7000 r.p.m. figure?Camshaft salesman/literature? Many of the "advertised r.p.m. ranges" are just guesses which are skewed up or down by engine size,header size,head flow,etc...If it makes good power up to 6000,and runs as quick as it "should"Why worry about revving to a certain number.
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