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Discussion Starter #1
We just finished our new and improved Trickflow CNC program for the twisted wedge and track heat SBF heads. I was wondering what kind of flow numbers some of you guys were getting out of these heads??

Flow tested at 28" with 2.055 intake valve
2.78 sq in at the push rod pinch

.100 72 cfm
.200 145 cfm
.300 203 cfm
.400 204 cfm
.500 285 cfm
.600 306 cfm
.700 323 cfm
.800 331 cfm
 

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Discussion Starter #3
im assuming there's a typo from .300 lift to .400 lift? shows only 1cfm change.

yes sorry about that

Flow tested at 28" with 2.055 intake valve
2.78 sq in at the push rod pinch

.100 72 cfm
.200 145 cfm
.300 203 cfm
.400 254 cfm
.500 285 cfm
.600 306 cfm
.700 323 cfm
.800 331 cfm
 

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About the norm...
 

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mine were ported by Walter Lester in Tampa and flow307 at 500" and 300 at 700" and 230 at 500" and 252 at 700" on the exhaust .....flowed on a 4.030 bore
 

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yes sorry about that

Flow tested at 28" with 2.055 intake valve
2.78 sq in at the push rod pinch

.100 72 cfm
.200 145 cfm
.300 203 cfm
.400 254 cfm
.500 285 cfm
.600 306 cfm
.700 323 cfm
.800 331 cfm

is that a 45* seat or 50* seats. good peak flow, but the .300-.500 #'s lower than could be. like to see those heads in the 220's @ .300, 270's @.400" & [email protected]"

What is the port volume?
 

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If you where to bolt an intake to the heads, would the flow numbers be different on the lower side of the range around the .200/.300? And BTW whats up Dave.
 

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Discussion Starter #11
the port ends up 227cc. The heads have a 45° seat. I know the numbers are low on our bench. when we tested and compared sharp edge orifice plates our numbers were down 13-15cfm on all settings. But all the years of data we have is based of the lower bench setting. When I turn the bench up to match the other benches we compared plates with. the head flows 221cfm @ .300 and 344 .800.
 

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I met Bryce last week and dropped off my fuel rails and manifold for some machining and he seems like he is dedicated to getting heads/manifolds flowing the best possible very enthusiastic to say the least.

Cant wait to drop my heads off for some work after seeing the one he did at the shop (EDL 60459's), Bryce thanks for taking your time and explaining things to me and showing me around the shop, you got some bad ass heads there.

Jake
 

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the port ends up 227cc. The heads have a 45° seat. I know the numbers are low on our bench. when we tested and compared sharp edge orifice plates our numbers were down 13-15cfm on all settings. But all the years of data we have is based of the lower bench setting. When I turn the bench up to match the other benches we compared plates with. the head flows 221cfm @ .300 and 344 .800.
What bench do you have?
 

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the port ends up 227cc. The heads have a 45° seat. I know the numbers are low on our bench. when we tested and compared sharp edge orifice plates our numbers were down 13-15cfm on all settings. But all the years of data we have is based of the lower bench setting. When I turn the bench up to match the other benches we compared plates with. the head flows 221cfm @ .300 and 344 .800.
Dang, big set of TW heads. I know from past experience with those heads, to get good .300-.550 #'s. it wont do so well at upper lift range like yours. and if you get the flow better up stairs, it always kills the mid-lift in those heads.

if you are running .800" lift came sure they work great. If I were running .550-.600" lift street/strip I like the other way like TEA does them.

so it really like always comes down to the application they are to be used in, JMHO anyways.
 

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Discussion Starter #20
Dang, big set of TW heads. I know from past experience with those heads, to get good .300-.550 #'s. it wont do so well at upper lift range like yours. and if you get the flow better up stairs, it always kills the mid-lift in those heads.

if you are running .800" lift came sure they work great. If I were running .550-.600" lift street/strip I like the other way like TEA does them.

so it really like always comes down to the application they are to be used in, JMHO anyways.
Thanks for the info... these heads are going on a strip 418 with a big solid roller. We flow test all of our heads to 1.00 and make sure the head has a well balance velocity profile at the mid and high lifts. From my testing I've found that if the head flows to 1.00 without backing up it will always make more real world power

for example these track heats flow 349 cfm @ 1.00
 
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