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  #1  
Old 12-21-2002, 09:43 AM
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Default Bigger RPM's

What needs to be done to get more rev's from my 340?

Is it just a matter of installing a cam with a 6000 rpm range, or do I have to make other mods?
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  #2  
Old 12-21-2002, 12:37 PM
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ehostler ehostler is offline
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I would beef up the bottom end, if you intend to run it at 6,000 on a regular basis.
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Old 12-21-2002, 01:20 PM
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Thanks for the input, but what would I need to do to get the motor to rev higher?
Is it the cam, heads, carb?
Or is my motor already capady capable of running those revs, just not safely, or still pulling strong.
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Old 12-21-2002, 06:21 PM
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ehostler ehostler is offline
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I missunderstood your question. I thought you were asking if the cam was the only thing you would need, to survive 6,000 RPM.

If you have a large enough carb, that engine will rev up to 6,000 with no problems.
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Old 12-21-2002, 08:53 PM
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1st, you'll need a cam. No point in spining the enginge that hi if your not going to make power up there. Most engines could rev that high but make no power. So whats the point of going to 6000 if your not makeing power?
2nd; Springs to match the cam. The springs keep the valve from floating. If your valves start to float, power goes away. This is why they come in matched sets from the cam maker for the cam you purchase.
3rd; a beefed up bottom end. If it can't take the power, why bother, if it can,continue reading.
4th; induction. (A) Have an intake that makes power up there. Stock won't due. (B) Enuff cfm to feed it. A smaller carb will be able to feed 6000 rpm, but it holds back power if theres not enuff CFM. Attach a vacuum gage to the carb. If it reads zero at wide open throttle while going up to and reaching the RPM limit, you have enuff carb. If not, step up.


Heads release the power. More flow the better. However, if your heads flow 300 cfm at .700 lift and your cam lift is .500, your not useing the full potentail of the head.
The limiting factor is now the cam.
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Old 12-21-2002, 09:34 PM
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Thanks for that great info, i'll definitly use it.
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