Thread: looking for a good power combo (need help)

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Geez, you don't need an RPM intake. I don't understand you guys who think the motor will be faster with a bigger manifold. All you'll do is kill off the low and mid range with it, where you do 99% of your driving. Now, is you're gonna drag race/street drive with a 383 and rev it to 6,500, then yeah, the motor could take advantage of a bigger manifold.

Originally Posted by techinspector1

Geez, you don't need an RPM intake. I don't understand you guys who think the motor will be faster with a bigger manifold. All you'll do is kill off the low and mid range with it, where you do 99% of your driving. Now, is you're gonna drag race/street drive with a 383 and rev it to 6,500, then yeah, the motor could take advantage of a bigger manifold.

If we are talking heads, cam, carb and associated parts to make 400+ hp, it would seem an RPM intake would be the logical choice. The Performer is designed to make peak torque at 3500 rpm and lose effectiveness after 5500 rpm. That kind of engine is going to see 6000 rpm with peak torque being in the area of 4000 rpm or so. Why would you want to compromise top end? An RPM dual plane manifold is not going to lose that much low end like a Victor Jr. would. I would just like to know the reasoning behind your response, that's all. No offense intended.

What about someting like this?

http://store.summitracing.com/partde...0&autoview=sku

Originally Posted by rumrumm

If we are talking heads, cam, carb and associated parts to make 400+ hp, it would seem an RPM intake would be the logical choice. The Performer is designed to make peak torque at 3500 rpm and lose effectiveness after 5500 rpm. That kind of engine is going to see 6000 rpm with peak torque being in the area of 4000 rpm or so. Why would you want to compromise top end? An RPM dual plane manifold is not going to lose that much low end like a Victor Jr. would. I would just like to know the reasoning behind your response, that's all. No offense intended.

No offense taken. You could be right.

Try this site:

http://www.ryanscarpage.50megs.com/combos1.html

So GM recommends red line of 5100rpm on this motor? No wonder you're worried about grenading it. Hard to make power in a 350 below 5000, just can't get enough torque. Does anyone know why GM is so conservative on this? I would think you could spin that SBC close to 7000 at least....

Chris

GM recommends a redline of 5100 rpm because the cam is so small it will not support more than that without valve float. If you change cams and use the appropriate valve springs, you can raise the redline. If you modify this engine correctly with matching parts, you will not have any problems. The recommended operating range for that cam is to 5800 rpm so you are not going to be pushing it much beyond that anyway.