Yes those are Fordson tractor valves for the intakes. I am using a Stipe 280 cam and a drilled Crower crank.
The head gasket has a "altered" shape to allow the use of the bigger valves
Interested to see how this works out.
If you read "Speed and Sport", it was done back in the T era. So really nothing new
One of our speedsters has Fordson tractor valves in it, not sure whether on both intake and exhaust, but we're going to do a valve regrind soon so if I remember I'll grab a pic and post it on here.
I've been running Fordson 1.66" valves in my '15 since 2003. Be sure to check clearance on the inside of the combustion chamber Les. Mine hit when I test rotated the engine with no head bolts installed. Had to grind as much as .100" from the edges of the combustion chamber on a couple cylinders.
I wonder whether the head will shroud the valve too much for this to provide any notable improvement in flow?
Here is with a stock size head gasket. Totally unworkable this way
Here is the special head gasket on the head I'm considering using. I think the valves will clear, but I will certainly verify.
Thank you for the "heads-up"
They will hit about half way up the side of the combustion chamber at or near max lift. I had to trim my head gasket too.
Les, Are the tractor valves larger than the 351w valves? Any reason you picked the tractor valves? Thanks for any info you can shed on this, Scott
The tractor valves are EASY!! Same stem as stock T valves. I just drilled 1/8" holes in the correct location and trimmed the stem length. I have a seat grinder which allowed me to open up the seats. So I can use stock T retainers with pins
Perhaps the valves you mention would work just as well, but I don't know!!
I will certainly check. The Pruss head is opened up considerably where you point, but who knows!!
Did you make this gasket or modify one that was off the shelf? I'm wondering how you deal with the pre-finished edge on the inside of an off the shelf gasket, or where you get the material to make one from scratch.
I bought the gasket from Kevin Pharis a couple of years back. I'm not sure if they are still available