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Old 10-27-2002, 11:00 AM
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Question 600 or 750 with Stroker and Solid/Mechanical Lifters

I recentlly bought a stroked 350 to put in my truck. I want to put in mechanical lifters and cam purely for the reason of the sound. I am just a teenager, my dad has had an exhorbanant amount experience with edelbrock carbs. They only make 600 and 750 and higher. For typical street and strip use, is the 600 sufficient for the 440 horses that my engine will put out. Along with mechanical lifters, because I read one of the posts that said if you have a large enough carb you could go with the mechanical/solid config. My dad says a 600 would be enough but I am not quite sure it will be. Please help. <img src="confused.gif" border="0">

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Old 10-27-2002, 11:49 AM
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If dad has worked on em, then he will know. Id listen to experience. Bigger isnt always better. HG
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Old 10-27-2002, 02:15 PM
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I agree with HemmiGremmi, but heres a forumla to follow.

The first thing to consider here is the CFM that you will need for your engine. There's a simple formula available that will put you right in the CFM ball park. The formula is:

Engine Size (CID) X Maximum RPM / 3456 =
CFM @100% Volumetric Efficiency
EXAMPLE:
350 CID X 6000 RPM = 2,100,000 / 3456 = 608 CFM

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Old 10-27-2002, 04:18 PM
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How are you so sure that your engine will put out 440 HP. It takes a strong small block to make that power. If it will, a 750 is in order. There are some other things to keep in mind however. A 600 will have better throttle response on the street, and may actually make more power at lower RPM. It is actually possible to make more power and run slower because the power does not "fit" the rest of the combo.

When you say stroked, I will assume that it is a 383. Using the formula in a previous post you will see that 383 would use a bit more air if spun up tight IF it was at 100% volumetric efficiency. That is a big if and a significant flaw in the formula, as it will be at more like 80% VE at 6000 rpm. The peak VE of an engine(which is stull usually less than 100) is at the peak of the torque curve and starts dropping after that. Use the formula at 6000 rpm and take 80% and you will know whether the 600 is big enough for maximum high end horsepower and torque.

Chris
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