? Flow #'s On LT1 heads
Registered User
Joined: Nov 2001
Posts: 1,751
From: Surrey, BC, Can
Originally posted by engineermike
There is a Pro Stock engine builder in New Orleans that has the latest and greatest flow bench (don't remember the model number). These guys port heads that flow well over 400 cfm. We brought in a set of expert-ported Brodix SUPR 23 degree aluminum heads and they flowed 295 cfm. The shop owner was very impressed - adding that he has NEVER seen a set of 23 degree small block heads flow over 310 cfm regardless of port size, so 295 was excellent.
Thunder Racing has done testing of numerous companies' "330 cfm" LS1 heads, only to find that they all flow around 280.
Think AFR 190's are good? They only flowed 233 cfm at Thunder.
AFR 210's? Not too bad, at 280 cfm.
In light of this, I've gotten to the point where I don't believe anything over 300 cfm in 23 degree SBC heads.
I HAVE seen LS1 heads flow over a true 330 cfm, but they aren't 23 degree heads, are they?
Mike
There is a Pro Stock engine builder in New Orleans that has the latest and greatest flow bench (don't remember the model number). These guys port heads that flow well over 400 cfm. We brought in a set of expert-ported Brodix SUPR 23 degree aluminum heads and they flowed 295 cfm. The shop owner was very impressed - adding that he has NEVER seen a set of 23 degree small block heads flow over 310 cfm regardless of port size, so 295 was excellent.
Thunder Racing has done testing of numerous companies' "330 cfm" LS1 heads, only to find that they all flow around 280.
Think AFR 190's are good? They only flowed 233 cfm at Thunder.
AFR 210's? Not too bad, at 280 cfm.
In light of this, I've gotten to the point where I don't believe anything over 300 cfm in 23 degree SBC heads.
I HAVE seen LS1 heads flow over a true 330 cfm, but they aren't 23 degree heads, are they?
Mike
It was not the vendors fault, but MY porter came up with numbers a lot less. He ported them and got 278 / 216 at .600.
Based on MY experience, you HAVE to get flow numbers from a bench OTHER then the porters bench to be able to advertize their flow numbers.
In fact, the ported numbers from my engine guy were not THAT much improved over AFR's stock advertised numbers but I'm not sure as to the crediblity of the AFR #'s
Last edited by 97TA-WS6-Con; Jun 1, 2003 at 12:11 AM.
Registered User
Joined: Mar 2000
Posts: 73
From: Fountian Inn, SC
Originally posted by engineermike
There is a Pro Stock engine builder in New Orleans that has the latest and greatest flow bench (don't remember the model number). These guys port heads that flow well over 400 cfm. We brought in a set of expert-ported Brodix SUPR 23 degree aluminum heads and they flowed 295 cfm. The shop owner was very impressed - adding that he has NEVER seen a set of 23 degree small block heads flow over 310 cfm regardless of port size, so 295 was excellent.
Thunder Racing has done testing of numerous companies' "330 cfm" LS1 heads, only to find that they all flow around 280.
Think AFR 190's are good? They only flowed 233 cfm at Thunder.
AFR 210's? Not too bad, at 280 cfm.
In light of this, I've gotten to the point where I don't believe anything over 300 cfm in 23 degree SBC heads.
I HAVE seen LS1 heads flow over a true 330 cfm, but they aren't 23 degree heads, are they?
Mike
There is a Pro Stock engine builder in New Orleans that has the latest and greatest flow bench (don't remember the model number). These guys port heads that flow well over 400 cfm. We brought in a set of expert-ported Brodix SUPR 23 degree aluminum heads and they flowed 295 cfm. The shop owner was very impressed - adding that he has NEVER seen a set of 23 degree small block heads flow over 310 cfm regardless of port size, so 295 was excellent.
Thunder Racing has done testing of numerous companies' "330 cfm" LS1 heads, only to find that they all flow around 280.
Think AFR 190's are good? They only flowed 233 cfm at Thunder.
AFR 210's? Not too bad, at 280 cfm.
In light of this, I've gotten to the point where I don't believe anything over 300 cfm in 23 degree SBC heads.
I HAVE seen LS1 heads flow over a true 330 cfm, but they aren't 23 degree heads, are they?
Mike
Bobby
Registered User
Joined: Feb 2001
Posts: 43
From: schaumburg
I think everyone here will agree that flow numbers are only a porting tool and not the definitive way to gauge performance.
There was a set of lt1 heads ported by Greg Good that appeared in the old lt1 head flow sheet ( anyone have a link to it ). I've actually talked to the guy that owned them and attempted to buy them. They peaked at 285 but had some really insane mid range numbers. That being acheived by a porting genius should shine some lite on lt1 head capabilities. If I recall correctly the car through an auto and mild solid roller put down somewhere around 420-430 rwh. on stock short block.
There was a set of lt1 heads ported by Greg Good that appeared in the old lt1 head flow sheet ( anyone have a link to it ). I've actually talked to the guy that owned them and attempted to buy them. They peaked at 285 but had some really insane mid range numbers. That being acheived by a porting genius should shine some lite on lt1 head capabilities. If I recall correctly the car through an auto and mild solid roller put down somewhere around 420-430 rwh. on stock short block.
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