Small Block Head Flow Chart

At the same time that I was working on the SB Victors, I also had a set of W9’s here.
The first set I’ve had in my hands.

I don’t know which part number they were, but the configuration was:
-11/32 unfinished guides
-completely unmachined seats
-cnc’d chambers
-as cast ports

They were here to get the guides sized, and the seats done. Basically what I’d do to them before starting in on porting them.

The seat inserts stood proud to the cnc chambers, and the ID of the exhaust seat ring was slightly larger than the as cast bowl, with the bowl being biased away from the exhaust flange.

The intake seat rings were way way smaller than the as cast bowl, and the as cast bowl was considerably smaller than normal for the 2.15” valve that was going to be used.

The guides were .005” undersized(valves not even close to fitting into guide).

The first step was fitting the guides.

The next thing I did was spot face the seats until they were just slightly below the chamber.

Then the intake seats got the ID bored to 1.915”(89% of the valve size). This left a step at the bottom of the insert where it met the as cast bowl of about 1/16”(bowl 1/16” smaller than seat insert).

The intake seat ring ID on the Victors was cnc’d to about 1.930, so I made these ever so slightly smaller to allow the porter to finish them to their desired size.

Then the valve job was machined into the seats, going deep enough to get some length to the top angle.
This left a slight edge where the top angle met the chamber, which I reduced by going in with a chamber relief cutter.

The owner asked if I could go in and mildly blend the as cast bowl into the seat inserts, which I did.

At this point, the heads were technically prepped enough to run, from a guide and seat perspective, although you really wouldn’t be scratching the surface of the potential of these castings.

The width of the cnc’d chambers on these heads were considerably smaller than the Victors, which is partly to blame for the noticeably lower low/mid-lift numbers.
That, and the Victors are fully cnc ported, and these got a minimal amount of blending.

Tested on the same 4.155” bore as the Victor, with the same 2.15/1.60 Ferrea valves:

Lift—— I/E
.100—- 72/58
.200—-138/112
.300—-196/156
.400—-248/183
.500—-289/197
.600—-310/207
.650—-289/210
.700—-289/213
.750—-291/215
.800—-289/216
.850—-288/217



MP shows unported W9’s as 200cc’s.

After .600 lift, the short turn gives up. It’s pretty tall, which is nice, but in its as cast form, is poking into the bowl some.

FWIW, MP shows a 261cc ported version to flow 343, a 270cc version with a 2.18 valve to flow 356.