Received my first order of the BBF and 351 C castings from Pro Comp today.
All in all not too bad considering the price.
The as delivered valve job is a 2 angle exhaust and 3 angle intake with 2.08"/1.65" valve sizes. The intake seat ID is too small for the head size and this hurts flow. The seat inserts are plenty big enough for 2.19"/1.76" valves.
As Randy stated the intake ports are Dove copies and the exhaust are a modified TFS copy that is purposely left small. The exhaust port location and height are as the TFS streets are.
There is a bunch of metal in these castings that does not need to be there. The wall thickness is such that making the ports larger is not a problem. I feel that this was intended to avoid patent infringement issues
These castings beat the as cast D3's on both the intake and exhaust when flowed with stock valves on the as delivered valve job.
When the bowls are blended and the intake seat ID addressed the castings beat the budget small valve D3's. Once lift exceeds .600" the intake ports get ugly just like the SCJ's do. They do however have strong flow numbers until .600" lift. This is really appropriate for a street head.
I do not see these castings producing the high lift numbers that the TFS streets do although they give them a good run till .400" even with the small valves. The flow numbers I have are with minimal work and the as delivered seats. I believe that the numbers will be better with my seat cutters and more extensive short turn radii work.
It looks like they will be a good replacement for the budget small valve iron castings even in a entry level budget version priced just above $1K.
Flow rates 1.65" exhaust:
As delivered / Bowl blended / Budget D3
56 / 62 / 58
99 / 105 / 108
138 / 139 / 137
159 / 162 / 155
172 / 178 / 170
182 / 189 / 180
183 / 196 /
184 / 200 /
Flow rates 2.08" intake"
75 / 74 / 78
147 / 150 / 150
211/ /211 / 211
257 / 264 / 258
270 / 290 / 287
290 / 299 / 306
I see some modest improvements coming with a better valve seat and more short turn radii work on the intake side and there seems to be about another 20 cfm exhaust available with a more agressive short turn shape again with the small valves.
To be honest I do not see the intakes surpassing the large valve iron stuff by much but the exhaust should be some 225 cfm or better. There is enough meat to make the exhaust port large enough to mimick the TFS exhaust port.
R&D is coming for a large valve fully ported version. I will update as more information becomes available.
For availability and cost information see post in the auction section.
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