Well title says it all, whats the highest revs you can run on a small block? I want to know cause i feel the need to build an engine that can run 7.5 all day...dont ask lol

i saw dak that was a mud racer and the guy said he would turn it to 8500 with out worrying about it, he said it was built for it but i dont remember what all was done to it .. it was a 318 if i remember correctly

 

some reason im doubting that.


you lookin to run 7.5 in a 1/4 or 1/8s? the most these will rev ive heard of is 6500- maybe 7k which at 7k theres problems with the springs bindin and the valves etc which its mostly in the head causin the limit in rpms.

 

you heard someone had a magnum valve train equiped motor turning 7500rpms??? lolzz

 

i think it was a first gen dak so it was prolly an LA with a carb setup but its purple with lime green like scallops with like tractor looking v-tread style tires ... its been on ebay a couple times

 

How much hp are you planning on making. B/c you can make 500+ hp under 6400rpm. After a certain point your not gaining anything by spinning the motor higher unless you have some radical heads and a huge camshaft in a lightweight vehical (under 3500lbs). I believe the valvetrain on a magnum motor is too heavy to turn pass 7k rpms I'd be worried about dropping valves or breaking springs. On an avg. 408 I would keep the rpms below 6500 or 6800rpm to keep the piston speed down and let the torque of the motor do the work for you. On my last 408 peak hp was right at 5500rpm but the tq and the hp stayed pretty flat across the board which is why it ran strong throughout the whole power band. On the new 408 build I'm shooting for a 6000-6200rpm peak hp being that I'm getting the heads ported and a larger camshaft.

 

Ever heard of rod stresses? They get um, really big at 7500rpm. I wanna hear it when your done though.

 

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my 5.9 can do 7500 rpms!! Its called tranmission slip!!! :mullet:...sorry couldnt help myself..just had to post.ya'll are getting to wound up.....:funny: .....

 

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i just want a migh ass revving v8, so i can have vtech too....lol

why do you wanna turn it so high?

i personally wouldnt turn it that high even if it was built for it

why not just get a honda?

 

Tom
Some of yall might know him "Tobbs" has a carbed Magnum 408 that he revs to at least 7k..
He posts on Devilbrad.

 

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well alright sounds like 7 is a magic number, this summer, after school or hell maybe even now ill take my block to my engine guy and have him run through it for me!

Damn! he has those kinds of powerzz?!?!?

 

You guys need to get outside the Dakota community more often, there are plenty of Mopar smallblocks out there spinning well over 8k rpm. You need the right valvetrain parts, and if you want to go over 7k you're gonna need a solid roller cam, hydraulics don't work too well that high.

The more important question is why? Having a setup that spins that high might sound cool, but it's only needed if you're making power that high, and if it is, it's probably a race only setup.

 

You guys need to get outside the Dakota community more often, there are plenty of Mopar smallblocks out there spinning well over 8k rpm. You need the right valvetrain parts, and if you want to go over 7k you're gonna need a solid roller cam, hydraulics don't work too well that high.

The more important question is why? Having a setup that spins that high might sound cool, but it's only needed if you're making power that high, and if it is, it's probably a race only setup.

:clap2:

Ding ding ding!!!! We have a winner. That's the primary reason for not running the magnum motors over 6500-6800 rpm. You can also use a helluva lot bigger cam with solid rollers.

 

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