Board index Flathead Power-Technical Questions, Answers, and Suggestions K-Models Valve seat inserts?

Valve seat inserts?

Moderators: Curt!, Pa

Post Sun Oct 15, 2006 9:31 am

Posts: 188
Location: sweden
What would you do with a valve seat that looks like this (front exhaust)?

Image

Might be hard to see properly from the pic, but it's been done really wide. The guys who's gonna bore them suggested inserts, but what are your thoughts on this guys?

Post Mon Oct 16, 2006 7:26 am

Posts: 639
Location: Wisconsin, USA
Unless the seat is cut very deep, there would be no reason to install a new seat. If just a little deep with a stock valve, a slightly O/S head diameter will put you back in the black. Search for a resent discussion on seat installation for opinion. My personal experience and observations suggest that installing seats in flathead cylinders just doesn't work well.

Post Mon Oct 16, 2006 8:15 am

Posts: 188
Location: sweden
Yeah, tried searching but did'nt find anything?

Post Mon Oct 16, 2006 12:22 pm

Posts: 329
Location: north central Ma.
I'd use a "Bowl Hog" to narrow the seat and use over sized valve but dont go to big or deep so if you ever do go the replaced seat route your not in trouble.
Bowl hogs are just steeper cutting seat cutters. Look over at Goodson.com

44Dwarf
PS: I think the seat post was in 45 flaties
"Smok'in the competition NOT Tobacco"
"Transplant organs, Don't bury them!"
Why dwarf? 5/8 scale race cars! http://www.dwarfcarracing.com

Post Mon Oct 16, 2006 1:03 pm

Posts: 188
Location: sweden
I guess this is the post you were talkin about?
http://knucklenutz.com/tech/viewtopic.p ... sc&start=0

Just talked it over again with the guy who's gonna do the machine work. And now he said that it was'nt gonna be a problem fixin the seats without using inserts! Maybe he just wanted a little extra work... :roll:

Post Mon Oct 16, 2006 2:34 pm

Posts: 329
Location: north central Ma.
That was the one.
"Smok'in the competition NOT Tobacco"
"Transplant organs, Don't bury them!"
Why dwarf? 5/8 scale race cars! http://www.dwarfcarracing.com


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