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Old 11-05-2010, 07:31 AM
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406 heads, cc runners or valve size

With a 406 10:5-1 Forged bottom end,balanced and studded,would a 185 cc 2.02-1.60,or a 235cc 2.o8-1.6 run better TQ&HP up to 6500rpm with a xs 282s soid flat tappet roller top pro magnums 1.5.or a lunati hyd roller 50162lun.
I do plan on spinning her at least once a day to 6500-6800 rpm in my 1980 Z28 m21 3:42 rear for now untill i go 5 speed with 4:10's any other suggestions,my budget for heads is 1100.00 US. Thank You.

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Last edited by sapsz28; 11-05-2010 at 07:43 AM. Reason: miss spelling
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Old 11-05-2010, 08:07 AM
How fast is fast enough?
 
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235cc head will most likely require special rocker arms for the valve offst. Why did you skip right over the 210-220cc range? That's right where you need to be.
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Old 11-05-2010, 11:09 AM
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406 heads

For the valve size the 200cc-220cc- have 2.02-1.60 and the larger runner has 2.08-1.60.
Do you think with those size cams it will make a large difference,on the final power ouput,I know the 200cc will have more TQ down low .whats your opinion.

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Old 11-05-2010, 11:45 AM
How fast is fast enough?
 
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There's a lot more to a head than the valve size, or even the runner volume for that matter. Hell, there's a lot more to a valve than the head diameter. I would stop where you are and do some real research to determine what you need, also you can call head manufacturers and get their advice, I would talk to a few before you buy, there's Dart, RHS, AFR, Brodix, Profiler, EQ, and I'm sure a few others to talk to.
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Old 11-05-2010, 04:11 PM
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I agree the 210-220cc range is where you need to be. Take a look at Profiler heads, very nice. They will install 2.055" or 2.08" valves in a 210-220cc head if you request it.
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Old 11-06-2010, 10:57 AM
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406 head

Thanks aigain ERIC
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Old 11-06-2010, 11:07 AM
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406 hread

Ap 72 I'm relying on the manufacturers to take of that business for me thats why they have engineers, I'm trying to find out through practical experience what works well, so if I,shoudn't care about the things you listed whats left I've got the rest of the valve geometry covered,springs retainers locks guides, I'm an assembler not a builder,but thanks for your time.
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Old 11-06-2010, 02:50 PM
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Building about the same engien and i agree a 200 at least cc head for that motor peferably a 210 id suggest a 210 pro-filer having a new set of 210 pro-filers ported by chad speier now awesome head and great prices. a 2.05 will work but a 2.08 will really wake up those motors.
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