Flex
Registered User
I posted this in the members only section but realize that a lot of you don't have access.
Well I finally got around to checking my head flow numbers prior to going in for my surgery. The numbers are decent for preliminary porting but I am not happy with the exhaust. Intake came in at 240 cfm and the exhaust at 166cfm. This nets an I to E ratio of 70% and is not close enough to optimal ratio that we figured was possible.
Turns out the exhaust seats were not manufactured to our request and could be hurting the head for as much as 20 cfm. My machinist and the owner of the head shop that performed the flow tests both figure that CHE sent us stuff off the shelf instead of manufacturing the seats we wanted. Sadly I had several sets of the correct seat in one of my 100 boxes of parts.
The gentleman that flowed the head figures I may be able to push the intake to 250 with some minor clean up on the short side and we are currently experimenting with a virgin head to determine if the actually seat we wanted would give us what we were trying to get for the exhaust.
He also told me that he was experimenting with a 3.8 head awhile back and thought that he may be able to put out better numbers by incorporating some of the numerous flow modifications he has uncovered over the last dozen years. His thoughts were that he could produce a better product than the heads currently offered by SSM etc. looking at the flow numbers on their sites, for less money than what they were asking and he wanted to know if there would be any interest to our members.
Well I finally got around to checking my head flow numbers prior to going in for my surgery. The numbers are decent for preliminary porting but I am not happy with the exhaust. Intake came in at 240 cfm and the exhaust at 166cfm. This nets an I to E ratio of 70% and is not close enough to optimal ratio that we figured was possible.
Turns out the exhaust seats were not manufactured to our request and could be hurting the head for as much as 20 cfm. My machinist and the owner of the head shop that performed the flow tests both figure that CHE sent us stuff off the shelf instead of manufacturing the seats we wanted. Sadly I had several sets of the correct seat in one of my 100 boxes of parts.
The gentleman that flowed the head figures I may be able to push the intake to 250 with some minor clean up on the short side and we are currently experimenting with a virgin head to determine if the actually seat we wanted would give us what we were trying to get for the exhaust.
He also told me that he was experimenting with a 3.8 head awhile back and thought that he may be able to put out better numbers by incorporating some of the numerous flow modifications he has uncovered over the last dozen years. His thoughts were that he could produce a better product than the heads currently offered by SSM etc. looking at the flow numbers on their sites, for less money than what they were asking and he wanted to know if there would be any interest to our members.