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Revised large valve flow figures... They are better....
Did some additional R&D on the procomps and have some interesting findings.
The exhaust port is in fact capable of more flow with some additional size added in the right places.
I managed to delay the uglyness that occurs on the intake side until .660" lift with additional short turn work. This does however start to diminish lower lift flow so I feel that this is the stop point.
Revised flow rates are as follows:
.100" / 52 / 84
.200" / 108 / 159
.300" / 159 / 220
.400" / 190 / 270
.500" / 220 / 303
.600" / 237 / 325
.700" / 242 / ..... 331 @ .660"
.800" / 245 /
The average intake flow rates are better than any of the dove iron heads I have available until .600" lift and the exhaust are just as good as the TFS streets till the same lift but with a smaller port cross section.
Seems to me that 650 to 700 HP is about the most I would reasonably expect from these castings N/A. While the intake flow hits a wall the exhaust is far better than any dove iron stuff and this will be an advantage although I can not venture a guestimate as to how much.
Seems fair to say that the std port stuff can be ordered as follows:
Small valve D3's no porting
Small valve D0VE's no porting
Small valve pro comp as cast seat no porting
Small valve D3 iron heads
Small valve D0VE iron heads
Small valve procomps fully ported
Large valve D3
Large valve D0VE
Large valve procomp
TFS steet castings as cast
TFS streets fully ported.
Hope this helps clarify the procoms place in the order of things passenger car port sized.
8)
Did some additional R&D on the procomps and have some interesting findings.
The exhaust port is in fact capable of more flow with some additional size added in the right places.
I managed to delay the uglyness that occurs on the intake side until .660" lift with additional short turn work. This does however start to diminish lower lift flow so I feel that this is the stop point.
Revised flow rates are as follows:
.100" / 52 / 84
.200" / 108 / 159
.300" / 159 / 220
.400" / 190 / 270
.500" / 220 / 303
.600" / 237 / 325
.700" / 242 / ..... 331 @ .660"
.800" / 245 /
The average intake flow rates are better than any of the dove iron heads I have available until .600" lift and the exhaust are just as good as the TFS streets till the same lift but with a smaller port cross section.
Seems to me that 650 to 700 HP is about the most I would reasonably expect from these castings N/A. While the intake flow hits a wall the exhaust is far better than any dove iron stuff and this will be an advantage although I can not venture a guestimate as to how much.
Seems fair to say that the std port stuff can be ordered as follows:
Small valve D3's no porting
Small valve D0VE's no porting
Small valve pro comp as cast seat no porting
Small valve D3 iron heads
Small valve D0VE iron heads
Small valve procomps fully ported
Large valve D3
Large valve D0VE
Large valve procomp
TFS steet castings as cast
TFS streets fully ported.
Hope this helps clarify the procoms place in the order of things passenger car port sized.
8)