midget,
The centerless grinding company I used to use, phone quoted a whopping $250.00 to grind 4 valve stems from .279" diameter to .235" diameter. Then, CNC re-profiling of the valve heads would be on top of that . . . . . . .
I have to guess that the quote is the "We don't want to do this." price.
Drilling and reaming/honing the valve guides out to .279" diameter is looking better & better . . . . . . . . . Until we find out the tooling prices for that . . . . . . . .
Fordboy
Every now and then, when Kate and I are having a disagreement - and I can say that in all the years we've been together, we've never had an "argument" (true fact) - when we've come to the point when a decision is to be made, we both reserve the right to say one word, and the subject will be dropped.
It's only happened a couple of times, and our mutual respect for each other and that decision making process has been a cornerstone of our continued success as a couple.
That one word is -
VETO.
$250.00 is a lot of beer.
Mark, thank you for investigating the cost analysis of this potential avenue, but at this point, I'm going to stand firm and announce
veto.I've got an e-mail off to REC.
As much as I'd like to do some more testing, the flows we saw yesterday were sufficient to the task, and it's clear that some gains can be made with some mild porting. Additionally, the 55 degree experimental back cut we did to the stock valves gave us a direction for valve shape, and provided the faces aren't dished and we can get a wasted stem, I'm of the mind that we'll go with the REC valves.
Are we being as thorough as we could be? No. Are we risking not maximizing head flow? Possibly. But given the numbers the stock K head gave compared to the ported Longman, we're far enough ahead of the game to risk suffering the consequences.