You’ll have to wait for that.
What diameter valves will the valve pockets be cut for?
2.055
Dish in the stock piston is .090 deep.
it is not
Blueprint spec is 9.580
Blueprint spec 6.125
But the lift actually has very, very little to do with piston to valve clearance. That's just not something I would even worry about.....especially with dished pistons.
Ok ok, I’m doing something weird. I’m putting w2 heads with 2.055 valves on a stock bottom end magnum 5.9 shortblock with a mildly aggressive hydraulic roller cam and twin turbos. As we all know (I hope) lift has nothing to do with piston to valve clearance, it’s the duration and ramp rates that get the valve in to the piston. Myself and Brian at IMM (he did my heads) are not sure if we’re going to have clearance On the stock piston with no valve reliefs. Even with a huge dish, the valves will hit on the outer edge of the flat portion of the top of the piston. I’m currently waiting for my blocks and relocation kit from Mike at B3 racing and then I can measure for pushrods and check P to V. It’s gonna be close.
I don't think it will be an issue. But remember, when you mock it up, Don't measure the clearance with the piston at TDC. That's not where they are closest. Go by the cam's valve events.....I'm sure you know that and I'm preachin to the choir.
i'm aware.
I got the secret out of him too. See how I did that? LOL
Yea I know how to measure for it. I’ve mocked it up a bunch already and and it’s very close with the cam in at 109.5, it won’t have more than .020 on the intakes right at the edge of the dish. Before I got too crazy I wanted to know how thick the crowns were and how much they’d need cut.
it's okay. i already knew!
....and you're SURE.....like 100% and not 99 that's that measurement is correct? It just doesn't seem possible they are that close. I guess they could be. If they are, I'd be skeered to cut those pistons. That'd be gettin that crown pretty thin, IMO.
What was the clearance with that cut? If it was enough, it might be ok. But I wouldn't cut those crowns very deep at all. They aren't too thick to begin with. That's a failure you don't want, Beavis.
I’m 100% sure and I’m cutting them if I need to. I’ll wait for final valvetrain stuff from B3 then decide how much to cut em. Thankfully most of the material will come out of the thickest part of the crown then just kiss the thinnest part.
