Flathead Machine Shop
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Tuned
Joined: Mar 2014
Posts: 319
Likes: 18
Flathead Build
I helped a friend rebuild an 8BA for his F-2 in another friend's shop. The block had two bad seats from corrosion. My friends \wWelded thick washers to the bad seats, taking care not to weld to the cast iron block material. A slide hammer was screwed into the washers after the weld cooled. The old seats popped out, new seats pressed in, and were ground. No special equipment needed. I agree with Ross, larger vales are probably not worth the effort for anything but a very built flathead.
Recommend covering the deck and cylinders to protect from weld splatter, or removing the valve seats prior to any other machine work.
Recommend covering the deck and cylinders to protect from weld splatter, or removing the valve seats prior to any other machine work.
Fleet Owner
Joined: Jul 2004
Posts: 27,287
Likes: 1,052
From: NM
Larry, are you going with Chevy 1.6" valves? If so the difference in valve head diameter is 0.100", not 0.010". If that's your plan I'd join up at Ford Barn and read about how to accommodate those valves, with respect to spring height and special keepers.
Logistics Pro
Joined: Sep 2014
Posts: 4,920
Likes: 21
From: Bothell & Silverdale, WA
You're missing the whole story hear Partner. REPLACING Valve Seats, NOT just grinding them aka Valve Job. My shop has done a valve job for me before, I'm looking to have oversize valves (seats) installed, and yes, the procedure is ALOT different on a Flathead vs. OHV motor.
Logistics Pro
Joined: Sep 2014
Posts: 4,920
Likes: 21
From: Bothell & Silverdale, WA
The procedure is still the same, just a little more cumbersome. The only thing that would be a little different is if you were offsetting the guides - that is more involved on a FH block than an OHV cylinder head. But the OP didn't say he was going to do that.
I understand the seat angles weren't mentioned. It was a question i asked.
I understand the seat angles weren't mentioned. It was a question i asked.
Thread Starter
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Tuned
Joined: Mar 2014
Posts: 319
Likes: 18
Flathead Build
Not talking about a va!ve job here, talking about cutting into the block to accept bigger VALVE SEATS !!!!!!! Has nothing to do with a valve job final angle cutting. THATS how it's different. By the way, even if I was putting 2.02 valves in place of the 1.88s in my Mopar, the heads would still need to be machined (cut) for bigger valve seats. It's machining the block on a Flathead to replace stock seats. Same thing only different.🤔
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Tuned
Joined: Mar 2014
Posts: 319
Likes: 18
Flathead Build
Yes, Chevy 1.60 valves, intake only. Valve stem diameter is the same. Got a great book on Flathead mods titled Flathead Fever. I will look into the Ford Barn. Author of this book says nothing about special keepers ?????? Thank you ! Oh yes, .100" ! My bad decimal placement.
Logistics Pro
Joined: Sep 2014
Posts: 4,920
Likes: 21
From: Bothell & Silverdale, WA
Now I understand. Setting up a large chunk of cast iron on a mill bed IS different than setting up a small chunk of cast iron on a mill bed. Got it.
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Fleet Owner
Joined: Jul 2004
Posts: 27,287
Likes: 1,052
From: NM
Yes, Chevy 1.60 valves, intake only. Valve stem diameter is the same. Got a great book on Flathead mods titled Flathead Fever. I will look into the Ford Barn. Author of this book says nothing about special keepers ?????? Thank you ! Oh yes, .100" ! My bad decimal placement.
Here's on post by a very experienced machine shop owner/builder: https://www.fordbarn.com/forum/showt...es#post1830277
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Tuned
Joined: Mar 2014
Posts: 319
Likes: 18
Flathead Build
Not an expert on them, but from threads I've read on Ford Barn, the issue is that the Chev valve keepers have a greater distance from the spring seat, so significant shimming, special keepers, or special retainers are needed to get proper spring height.
Here's on post by a very experienced machine shop owner/builder: https://www.fordbarn.com/forum/showt...es#post1830277
Here's on post by a very experienced machine shop owner/builder: https://www.fordbarn.com/forum/showt...es#post1830277
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