question for the motor heads
Thread Starter
Racer
Joined: Nov 2007
Posts: 350
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From: coon rapids mn
question for the motor heads
two heads with the same runner volume valve size and combustion chamber but one flows 20 cfm's more at a certain valve lift how much power difference is this going to equate to? this is according to each manufactures specs!
Race Director
Joined: Apr 2000
Posts: 17,676
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
A rule of thumb for a properly built pump gas high performance motor is ~+/- 2HP per CFM. I am talking about a motor built with the correct matching parts.
My previous 406ci had heads on it that flowed ~280cfm and made 547HP on an engine dyno with no tuning
My previous 406ci had heads on it that flowed ~280cfm and made 547HP on an engine dyno with no tuning
Last edited by MotorHead; Oct 9, 2009 at 04:38 PM.
Thread Starter
Racer
Joined: Nov 2007
Posts: 350
Likes: 0
From: coon rapids mn
so the to heads I'm looking at are the brodix ik180 or the afr 180 street eliminator on a 350 9.5 comp. gm hot cam rpm intake Holley 750 vac. 1 5/8 headers 2.5 magna flows th400 3:73 gears . so my dilemma is are the afr heads on my combo worth the extra money
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
If your cam lifts the valve high enough to take advantage of the extra 20cfm then yes they are worth the money. You also look at the midrange numbers and compare how much better the AFR's flow there too. I have AFR227's that flow 320+cfm and I think they are worth every cent I paid for them
Race Director
Joined: May 2005
Posts: 10,674
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From: Millington Illinois
St. Jude Donor '08-'09
I would go with the AFR's. Price difference is under $400 for close to 40 HP. You will feel that difference in your wallet and the seat of your pants.
Racer
Joined: Dec 2008
Posts: 300
Likes: 0
From: Toms River NJ
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