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  #61 (permalink)  
Old 10-28-2012, 08:06 AM
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350 build suggestions

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Originally Posted by 85jimmy350 View Post
What are things to look for in a carb? It seems like there are a whole lot of options beyond the basic two and four barrel options I'm familiar with. What CFM range should I look for...what would start being to small and what would start being larger than what is necessary?
This formula has been around a long time. CFM = (RPM x CID)/ 3456 Example: 6500 x 406 / 3456 = 763.59953. A 750 cfm carburetor would be chosen for a 406 cid engine. 350 x 6500/ 3456 = 658.27546, A 650 cfm carburetor would be chosen for a 350 engine. Of course for a 800hp 454 engine the results of this formula would be too small. But a carburetor that is too big would make the engine run lean. You can also use this formula with your normal cruising rpm to figure for the primary side of your 4 barrel carburetor. Examples are Carter spreadbore carbs, a 600 cfm carb has a 250 primary and a 375 secondary.

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  #62 (permalink)  
Old 10-28-2012, 09:48 AM
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so,if I have a 327 030 bore making 400HP,I only need a 650 cfm carb?

If I apply the same air flow formula to my cylinder heads,I only need 180 cfm flow on my intake runners or my engine will run lean?
I understand that,now how do I decide what size of header tubes I need to match this package? I never measured a 150 cfm header so I have no idea how to calculate?
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  #63 (permalink)  
Old 10-28-2012, 11:38 AM
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Quote:
Originally Posted by vinniekq2 View Post
so,if I have a 327 030 bore making 400HP,I only need a 650 cfm carb?

If I apply the same air flow formula to my cylinder heads,I only need 180 cfm flow on my intake runners or my engine will run lean?
I understand that,now how do I decide what size of header tubes I need to match this package? I never measured a 150 cfm header so I have no idea how to calculate?
This is a joke right? Sometimes its hard to tell.
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  #64 (permalink)  
Old 10-28-2012, 11:50 AM
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Yes ap72,its a joke.Carb size does not have to be exactly anything.I would use a 750 on a 327 if it was my car.I wont pick a rear gear ratio based on cam timing. so many things are said as "you will need,,,, with that,,,,,?"

sorry I had to vent,I was wrong to do that. everyone that posts genuinely is trying to help and I apologise for my post
Thanks ap for pointing that out
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Old 10-28-2012, 10:03 PM
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Anyone have any suggestions/good experience with $500-600 aluminum heads? Anyone have any opinions on Procomp PC3002-PT heads or better suggestions?
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  #66 (permalink)  
Old 10-28-2012, 10:26 PM
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you get what you pay for
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  #67 (permalink)  
Old 10-28-2012, 10:33 PM
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Quote:
Originally Posted by 85jimmy350 View Post
Anyone have any suggestions/good experience with $500-600 aluminum heads? Anyone have any opinions on Procomp PC3002-PT heads or better suggestions?
By now, most fellows will say that the Pro Comp castings are OK, but buy your own quality components to fill the heads (valves, seals, springs, retainers, keepers, rocker studs, guide plates). I've read several places that the components that come assembled on the heads are junk. Use the proper tools to check all dimensions for yourself.
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  #68 (permalink)  
Old 10-29-2012, 01:48 PM
How fast is fast enough?
 
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Originally Posted by 85jimmy350 View Post
Anyone have any suggestions/good experience with $500-600 aluminum heads? Anyone have any opinions on Procomp PC3002-PT heads or better suggestions?
I would take these over Pro Comp's every time.

Assault Racing Complete SBC Small Block Chevy Aluminum Cylinder Heads Straight Plug 350 383 400 - KMJ Performance
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  #69 (permalink)  
Old 10-29-2012, 02:15 PM
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I like them...they're shiny. HAHA Why these versus the Pro Comp's, or any of the others in that price range for that matter?
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