Dished vs. flat topped pistons?
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Junior User
Joined: Dec 2003
Posts: 66
Likes: 0
Dished vs. flat topped pistons?
Is there any differance in performance with open chambers and the same compression(9.0-9.5)?
with the flats down in the hole and the dished up at the deck.
just some thought for my up comming 400 rebuild.
with the flats down in the hole and the dished up at the deck.
just some thought for my up comming 400 rebuild.
Lead Driver
Joined: Nov 2000
Posts: 6,628
Likes: 345
From: Albuquerque
You would get a lot less preignition with the dish pistons that set up higher on the outside edge. When you run flat tops that sit low in the hole the void created in the cylinder will cause problems. I went from 9:1 flat to 10:1 dished and have less ping.
Elder User
Joined: Sep 2003
Posts: 908
Likes: 4
"Milling >.056 off the block is a scary proposition IMO. I'd be more inclined to find some pistons with a taller comp. height."
As long as the milling is done to match the intended pistons, I don't see a problem. True, it might make future rebuilds a problem.
I've heard of people using 300 I-6 pistons in the 400, but in that case, the piston has to be milled.
As long as the milling is done to match the intended pistons, I don't see a problem. True, it might make future rebuilds a problem.
I've heard of people using 300 I-6 pistons in the 400, but in that case, the piston has to be milled.
