410 LA small block will not rev past 6000

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You’re 20* short on the camshaft duration. I ran a [email protected] solid in a 365 with 4.30 5400 max power. Now a 244/[email protected] with 3.91 max power 5800 revs to 6200 slower ET. Your valve “dwell” is too rapid. I was going to order a 268/278 for a 414 and was advised to spec 272/282 for 6700 rpm. Look up Huges Dyno charts. He’s running high 260’s at .050 in 360’s with oem castings #587. Your motor is trying to breath through a restricted dwell window. You need about 4-6* more advance too.
 
Nice car, drive the snot out of it. You should be forced to run higher rpm’s, not wanting to. The more RPM, the more maintenance. If there is some reason you need the rpm, small cubes, small stroke. Well, you get to ride the lightning! You have a little tire that doesn’t lend it self to hard launches? Step on up!
 
PRH said:
Regardless of what the graph “looks like”, HP & TQ are always equal at 5252 RPM.
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True and also every Rpm hp % of torque is fixed eg.. Hp is 50% of tq @ 2626 rpm, hp is 150% of tq @ 7878 rpm etc.. Basically 19% per 1000 rpms.
 
autoxcuda said:
If you are happy with the way it drives and performs.... leave it alone.

What is the fascination with 6500rpm? It's just a number.

Would you be happier making the same HP and TQ at 500 more rpm than you do now? If so, you'll need more gear and you will just be tougher on your parts, especially valvetrain.



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On the dyno chart peak power is about 20 mph less then where power takes a down turn, that's a lot more than 500 rpms. When I calculated rpm from peak hp and the torque at that speed it put peak hp just under 5,000 rpms.
 
It says peak 416 hp is at 93.75 mph and from what I can tell tq is about 440 lbs-ft @ 93.75 mph.

416 hp x 5252 / 440 tq = 4966 rpms. 360 hp x 5252 / 475 tq = 3980 rpm, 400 hp x 5252 / 360 tq = 5836 rpm.

So 416 hp @ 4966 rpms, 475 tq @ 3980 rpm and power falls off at 5836 rpm. If I'm reading the # right.

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Two things I would do is set the lash at zero like one of the other folks other suggested and I know you're not going to want to hear it but try a carburetor
 
Doesn't anybody else think its odd this engine hp peaks at just under 5000 rpms ?
 
I think you have the components to go to seven grand, I would go with a solid lifter or to save some money right now. Put the lash at zero and bump the timing up. Those are two no-cost items that you can try right now
 
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