Probe pistons

Mark O'Neal wrote:

Lem Evans wrote:

Mark O'Neal wrote:Thanks. I'd appreciate it.

That OEM/AFR valve relief came out a lot better than I thought it would.

How many CCs in the intake relief of the 'dual' piston?

How deep?

.310 with w .375 top land. I haven't done it on a flat top yet, he had a dish. I'll have it in about two weeks. I think it will end up at 4 ccs.

Yes, I was thinking about the flat top unit. Dish be an easy deal.

While you are at it.....SCJ/P51/AFR dish.

I can do it, just adding the SCJ to the dual pocket.

But it be ugly

Mark O'Neal wrote:I can do it, just adding the SCJ to the dual pocket.

But it be ugly

It's easy deal with a dish.

-7 @ .310 by "my guess".

Diamonds are .195" deep and will handle a big ass cam.

SCJ/P51 relief on a dish piston should be much more than a 'nick' in the rim.

gt350hr wrote:  -7 @ .310 by "my guess".

It needs to be deep for the stock production location notch but, much shallower for the others.
Doing it all with one notch would take a few cc's of metal for sure.

I'd do a single cut for the OEM and AFR and a separate divot for the SCL.

What compression height and compression ratio.....1.350 (with 4.300 or 4.500)?

The volume of the relief would be irrelevant then, it's just part of the dish.

Mark O'Neal wrote:I'd do a single cut for the OEM and AFR and a separate divot for the SCL.

What compression height and compression ratio.....1.350 (with 4.300 or 4.500)?

The volume of the relief would be irrelevant then, it's just part of the dish.

A divot. Exactly.

Mark O'Neal wrote:I'd do a single cut for the OEM and AFR and a separate divot for the SCL.

What compression height and compression ratio.....1.350 (with 4.300 or 4.500)?

The volume of the relief would be irrelevant then, it's just part of the dish.

My curiosity about intake relief volume was relative to a flat top piston.

6 or 7 ccs, would be my guess.