Thread: Determining Redline...

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dug, nobody is willing to step up and give you a definitive redline on a motor because nobody has access to a working crystal ball. It's all about the combination of parts you use. What's the weight of the crank, is it forged or cast, what's the stroke, what's the piston speed in feet per minute, what's the weight of the rods, forged or billet, what's the weight of the pistons. What everybody is saying about the cam is valid. Any cam you choose will have an operating range of about 3,500 rpm's, so if you choose a street grind, depending on your choice, you might be experiencing valve float at 5,000 r's, or 5,500 or 6,000 or whatever. Now, don't hold my feet to the fire on this, but I believe some of those NASCAR motors are buzzing up around 10,000 r's, so the cam they're using is probably making power from about 6,500 to 10,000.

I wouldn't have a problem turning a short stroke street motor to 6,500 or 7,000 r's if it had good rods and rod bolts in it and of course, a cam and springs to support those r's. I'd also prefer a 4-bolt main block to keep the crank planted. Now, since I've said that, I just know someone will come on here and say that they've turned their SBC to 8,500 or 9,000 and that's fine. The question is, how many times can they do it without running over the crank?

Hey Scooter, seriously, how tight have you wound a 283?