I am using a Neway style cutter on seats however I am having difficulty finding a .375 pilot with a .327 taper for the .015" oversized valve stems. What is being used in this application?? I hate to use an expandable pilot, so I am hoping someone has a source for this size guide.
Brent I've been hunting all over the Internet and it sure does look like you'd be better off with the .030" oversize stem valves, otherwise you're stuck with an expanding pilot.
I now remember running into this same problem. I wanted to get the Neway valve seat cutter kit but they didn't have the solid pilots I would need for the first oversize valve stems. So I went to 351 Windsor exhaust valves on my T which are .030" up from stock T size. They work great in the engine and I figure once these wear into the block too much I'll just get bronze valve guides and go back to stock stem size.
Also, if you're reaming the valve guides with a hand reamer, I highly recommend getting a slightly fatter than you think you need pilot. Neway calls this as whatever size +1. I found that I needed that slightly oversized pilot because the exactly sized one sank all the way to the shoulder.
I'll keep looking into other brands and let you know if I find anything that is .375 top with a .327 taper.
(Message edited by wreckrod9 on June 21, 2016)
McMaster-Carr or MSC can get you any size reamer you want. And .005 to .001 steps. Any size you want. Scott
Thanks Seth/Scott. Reamers I have, however it is the pilot that I am struggling with.
If vendors are offering the .015 O/S Valve and the appropriate reamer, what are folks using for a pilot to do the seat work?? (...Just does not seem proper to go to the .030 stem when .015 would clean it up.)
Neway will make any size pilot you want. They made my .015 oversize pilot. Call them for details and pricing.
Buy a drill blank the size you need. They come in more sizes than reamers. Scott
I'm curious, why the reluctance to use an expandable pilot? I would think if the guides have been accurately reamed, they shouldn't present a problem.
Did you try Goodson? They have related tools. Dave in Bellingham WA
Walk over to my lathe and make one
Brent - Richard Gould asked just exactly what I also wondered, which is why you are reluctant to use Neway's adjustable, or expandable pilot,....??? Neways adjustable pilot is the only pilot I have with my Neway outfit, and it works just fine. Again,....just wondering and thinking that I might learn something from you Brent,.....harold
I do it on a drill press with an expandable reamer. Works great.
I did try Goodson. Goodson's pilots jump from .3165 up to .3397.
Richard/Harold, it is just a concentricity issue with me where I feel a ground tapered pin should provide a tighter tolerance over and expandable unit. Likely why I hone fit various bushings instead of using a reamer.
Paul is probably spot-on with this in that I need to call Neway direct and have it made.
Thanks for the replies everyone!
Brent, if you either find a source for the solid pilot or get a quote from Neway, I'd like to know.
Brent: Had this problem for a while. I do not more, no longer use the T valves since had trouble with the repro spring keepers failing. I use the modern valve and there are pilots made for them. And the modern valves are made oversize too, so in 10 years when someone else rebuilds the engines they just get oversize valves. Dan