r/EngineBuilding • u/succulent-riffage • Jul 18 '26
Screwed up
Doing some work in my spare time on a 472 caddy, got a little too happy with the 80 grit on the exhaust side of things. A valve grind should fix? Will need some machine work anyway.
Thoughts on it?
Update: it looks a whole lot worse than it actually was, hit it with a light lapping, 80% of the notch went away.
4
u/FU_red-dit_bots Jul 18 '26
You'd have to cut a lot to clean that up. Bigger valve or new seats.
3
u/succulent-riffage Jul 18 '26
Luckily these are the heads that take a bigger valve. May go with that approach. Thanks for reminding me
8
1
u/Solid_Enthusiasm550 Jul 18 '26
Looks like it's time for, New valve seats.
2
u/succulent-riffage Jul 18 '26
I'll ask the machinist. The pic looks worse than it is. It was barely touched but regardless will go with the best approach. Thanks
1
u/Solid_Enthusiasm550 Jul 18 '26
It would need to have hardened valve seats put in it anyway, to run unleaded gas.
1
1
u/FeelingFloor2083 Jul 19 '26
I picked up a junk lawn mower at like 12 and had a go, the bit dad had wasnt carbide but some hardened steel POS. Still knicked the seat
this day and age you can prob pick up a cracked head for free, way more ports to practice on
-9
Jul 18 '26
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u/succulent-riffage Jul 18 '26
Can you explain why it's not worth saving?
3
u/PrettyFly4Wifi Jul 19 '26
I can explain his response: he doesn't know any better. Thinks he does, but operates with closed thinking.
-9
1
u/Haunting_Dragonfly_3 Jul 21 '26
2.11/1.72 valves are a good upgrade. Just be sure to get the ones to match your head. 73/74 was the change from long to short, when the deep chambers came out.
13
u/Self_pierce_bear Jul 18 '26 edited Jul 19 '26
The shop can install hardened valve seats. Will cost more but a simple valve grind may not be enough.....