Valve lapping questions

[RustyRatRod]

What people forget about exhaust valves is they are supposed to have wider seats. IMO, I like how wide those are. The more surface area the exhaust heat is dispersed on as it exits across the valve and seat, the more area there is to dissipate that heat. I think that's good for a street engine. But stick around. Opinions will vary. lol

 

[prorac1]

Checked spring height. I'm impressed at how close they all are. 1.650 is installed height.

The numbers below are from Spring Seat to retainer.

I wish everything came out this close. No shims required.

Thanks. Eric

 

[moper]

It's an exhaust valve. They are supposed to be wider than the intake. This ain't no 20K race motor. Lap, slap um and run um.

X2

 

[C130 Chief]

It will run just fine as-is. Wider seat faces will impact longevity a little. Wider seat faces plus loose valve guide clearance will impact longevity a lot. If I was looking to get something on the road I wouldn't hesitate for a minute. If it needed to run 100K miles before the next valve job, well... The problem is, without installing insert seats you'll end up sinking the valves to narrow the seating surface, and that causes it's own set of issues. I've driven worse, and sold far worse.

 

[famous bob]

It will run just fine as-is. Wider seat faces will impact longevity a little. Wider seat faces plus loose valve guide clearance will impact longevity a lot. If I was looking to get something on the road I wouldn't hesitate for a minute. If it needed to run 100K miles before the next valve job, well... The problem is, without installing insert seats you'll end up sinking the valves to narrow the seating surface, and that causes it's own set of issues. I've driven worse, and sold far worse.

I got tired of reading these posts, and skipped to the bottom. I think I`d have them back cut to make sure their round and reduce the seat area a little. Those eyebrows around the valve seats are h.p. killers, now is the time to do a little to them too .-----free h.p. !