The Ford Barn

Kahuna · 02-12-2013, 12:25 AM

For you flathead builders, what is the reason for the tops of the lifter bores being ground down a bit?
Is this to make it easier to check the adjustment with adjustable lifters?
I know about drilling of the bores to ease adjustment using a drift, but am wondering about grinding the tops of the bores?
Thanks for the insight
Jim

51 MERC-CT · 02-12-2013, 12:55 AM

More wrench clearence when using lifter that requires tool to keep it from rotating. Most likely will have to grind down (thin) wrenches to get them to fit if no extra clearence is provided.

Russ/40 · 02-12-2013, 01:41 AM

Cam regrinds result in a smaller base circle. Smaller base circle results in the lifters sitting lower in the bores. This is compensated for with longer valves. Shaving off the tops of the lifter bores improves access for lifter adjustment.

Pete · 02-12-2013, 02:20 PM

All of the above reasons, PLUS, shortening the life of the lifter bore.

Kahuna · 02-12-2013, 04:00 PM

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Thanks everyone. I get it now

02-12-2013, 12:25 AM	#1
Kahuna Senior Member Join Date: May 2010 Location: NorCal Posts: 2,617	Valve lifter bore grinding For you flathead builders, what is the reason for the tops of the lifter bores being ground down a bit? Is this to make it easier to check the adjustment with adjustable lifters? I know about drilling of the bores to ease adjustment using a drift, but am wondering about grinding the tops of the bores? Thanks for the insight Jim

02-12-2013, 12:55 AM	#2
51 MERC-CT Senior Member Join Date: May 2010 Location: East Hartford, Ct Posts: 5,898	Re: Valve lifter bore grinding More wrench clearence when using lifter that requires tool to keep it from rotating. Most likely will have to grind down (thin) wrenches to get them to fit if no extra clearence is provided. __________________ DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES

02-12-2013, 01:41 AM	#3
Russ/40 Senior Member Join Date: May 2010 Location: Santee, California Posts: 3,505	Re: Valve lifter bore grinding Cam regrinds result in a smaller base circle. Smaller base circle results in the lifters sitting lower in the bores. This is compensated for with longer valves. Shaving off the tops of the lifter bores improves access for lifter adjustment.

02-12-2013, 02:20 PM	#4
Pete BANNED Join Date: May 2010 Location: Wa. Posts: 5,423	Re: Valve lifter bore grinding All of the above reasons, PLUS, shortening the life of the lifter bore.

02-12-2013, 04:00 PM	#5
Kahuna Senior Member Join Date: May 2010 Location: NorCal Posts: 2,617	Re: Valve lifter bore grinding Sponsored Links (Register now to hide all advertisements) Thanks everyone. I get it now