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#1
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440 redline
What RPM is safe to shift at with a 69 440HP if bottom end is all stock? I get out just after 6000 but it still pulling.
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#2
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Is the bottom end 36 years old? I rapped my 68 340 to 6500 and pulled a rod out of a piston. I would get some 180,000 PSI rod bolts to be safe (ARP, Pioneer, etc). I would think 6500 would be the highest I would ever go, I chip/dial out at 6400 on an ARP equipped 451 because I cant afford another one and I dont need 500 more RPM's to win any friends.
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#3
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The engine was freshened up in 96 and hasnt seen a lot of miles since. New bearings and rings at least. Unfortunately I dont know too much more about whats inside. (I will let you know what it had after I blow it up!)
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#4
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Generally, new bearings means the rods were resized. That usually means the rod bolts were replaced. Piece of mind would tell me to chip it at 6500. 383's have a shorter stroke and 7000 has been achieved on these according to some of the sadists on this board. Factory probably put the red at 5500 for warranty sake.
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#5
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Interesting discussion, one thing I'm curious about. Back when I used to bracket race fairly stock non-HP 383-400s and 440s, I usually found that though the motor would twist higher, the car would e.t. slower if I went past 4200-4400 rpm. They could rev higher, but I never saw any quicker times slips by doing so.
Naturally a HP or race motor would have a higher rpm before peak torque-hp. What I am wondering is while some of you are turning some serious rpms, do you need to? Granted a radical motor with large ports and a tall cam with stiff valve springs is going to twist higher, but I've always considered a B-RB motor as a torque motor and usually I've had pretty good success when I don't try to rev it as much. My general opinion is if you're revving it hard enough to worry about durability, you may be overrevving it. If nothing else, some time spent during test and tune at your local strip may show just where your engine likes to be shifted at. It may be worth experimenting and moving your shift rpm up or down a few hundred rpm to see if you can cut a lil off of your e.t. and you might gain a little bit of durability if you're not stressing the motor more than you need to. |
#6
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I hear you Stoga. I was watching a demo derby half time show and it was a few cars kicking around an obstical course. Lots of hair pin turns and WOT races to another cone. The Camaro was racing a mustang and the camaro was shifting at 4000 or so as well as I could tell. The mustang was really winding it out and shifting closer to 6K. The camaro was killing him with those low rpm shifts and scooting right past the Mustang that was still in 1st of a 3 speed auto. Both were running autos and It sounded like the GM was in D the whole time. Interesting race would be a full race cam motor against a RV cammer in the 1/8, both built for that race. RV would be in 3rd and pulling hard before the cammer would be out of first...
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#7
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Stoga speaks wise words. A 400 has to be built with pretty stout parts to peak at 6000 rpm, actually our old version did and produced 649 hp there. A typical modified 400 hp high perf street 440 peaks at about 5000 rpm. It will wind up to 7000 if you let it, but it will not produce power there, so winding it higher than for example 5500 isn't going to make things any better.
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#8
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Take it to the track on a test and tune night and start shifting @ 5000 and progress higher (At 500 rpm more rpm) until et falls off. Then go back inbetween the last and find the inbetween shift point
Example, good at 5500, et falls off at 6000, try next shift @ 5700 and see where your at. Slower, next pass less rpm, faster, try again with another 100 rpm. etc..... |
#9
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You guys have given me plenty to think about. I am not sure whether or not the car would be faster shifting at a lower rpm. It does seem like it is still pulling at 6000 rpm, But I wouldnt know whats best unless I go to the track and test. I am very curious now. Gotta get my six barrel to perform 100% first. Thanks for all your advice.
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#10
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My last 440 ran fastest shifting at 5800 rpms with a big cam and ported heads. Stock big block heads stop flowing around 5000 rpms.
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