Redline?
Senior User
Joined: Jan 2005
Posts: 389
Likes: 4
From: Visalia, California
Originally Posted by ShadowWulf
What the aproximate redline/safe point of the 460 blocks produced in the 1970's, assuming the block/head are factory stock?
Just my opinion.
Last edited by quehele; Feb 6, 2006 at 06:28 PM. Reason: spelling
Post Fiend
Joined: Jul 2003
Posts: 11,945
Likes: 3
From: Spokane, WA
Originally Posted by quehele
I start to get uncomfortable around 3500 rpm...and a LOT uncomfortable at 4000 rpm.
As Rob mentioned with the stock heads/cam you'll never get enough air to spin them at an RPM that will destroy them. With my stock heads I couldn't get too far above 5K even if I put it in neutral and just stood on the throttle.
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Junior User
Joined: Jan 2006
Posts: 54
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From: San Bernardino, CA
Thanks guys, alot of good info (a bit conflicting though) but good info nevertheless for me to ponder during my rebuild. Would it be even worthwild to pursue pushing the redline back a tad farther on a motor this large? Or would the gain be of no noticable difference? (heh, im not asking for 12K honda redlines either...maybe 7K though?)
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Joined: Dec 2003
Posts: 18,423
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From: iowa
you start looking for a 7k redline, first thing you need to upgrade is the rods, next get some good forged pistons. the crank and block will handle 9000 rpm just fine if balance properly but the factory rods won't take that kinda RPM
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Post Fiend
Joined: Jul 2003
Posts: 11,945
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From: Spokane, WA
The info here isn't really conflicting. quehele's opinion of redline is a pretty common mentality with "big block" engines because people are afraid they'll fly to pieces when you spin them that fast. I know there are a lot of guys who are afraid to spin them over 4K just because they think it'll all fly to pieces (and it's freakin LOUD too). But the stock lower end "redlines" at about 6K . . . meaning you really don't want to spin it much faster than that or you'll be risking rod failure or loosing a piston skirt. You just can't get it to turn that fast with stock heads and cam which is why Gashog and I mentioned that you'll be lucky to get it to go to 5K with a stock motor. If you perform the upgrades in rods and pistons which are mentioned above you will still need to upgrade the heads and cam too, or you could stand on the gas all day and it would just never turn that fast.
With upgrades you can do some crazy stuff with these engines. Ask monsterbaby where his rev limiter is set when he's bouncing off of it.
With upgrades you can do some crazy stuff with these engines. Ask monsterbaby where his rev limiter is set when he's bouncing off of it.
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Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
well the only video I have of it bouncing off the rev limiter it was set at a measly 7600, but it's set at 8000 now
Here is the vid if you want to here a big block bouncing off a 7600 rev limiter.
http://www.supermotors.org/vehicles/....php?id=227151
Here is the vid if you want to here a big block bouncing off a 7600 rev limiter.
http://www.supermotors.org/vehicles/....php?id=227151
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Joined: Jan 2003
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From: Ilion Herkimer
i ran mine at 3000 rpms when iver i drove it on the highway.. 33's and 4:10's. the most i got the r's upto was just over 5000 trying to pull a log that was nearly 30 " across and almost 30' long.......
