Modzilla

[Sonny]

OH YEA, I'm sure a nice set of Turner pistons would be "kick ass" in a 25

[jeff55v]

44xs pistons.

Concerning 2 and three ring pistons, this is from the APBA S.O. technical rulebook:

"12. Only pistons and piston rings manufactured by Mercury/Mariner
specifically for this engine are allowed. Legal parts for three-ring
pistons are: Pistons: P/N 743-5172A6 (standard), P/N 743-3366A2
(0.015 oversize), and P/N 743-7716A2 (.030 oversize). Rings: P/N
39-27841A12 (standard), P/N 39-28616A12 (0.015 oversize), and
P/N 39-89822A12 (0.030 oversize). Legal parts for two-ring
pistons are: Pistons: P/N 780-9229A7 (standard), P/N 780-
9229A10 (0.015 oversize), and P/N 780-9229A11 (.030 oversize).
Rings: P/N 39-18653A12 (standard), P/N 39-18653A1 (0.015
oversize), and P/N 39-18653A2 (0.030) oversize. It is permissible
to “collapse” the bottom ring on the older, three ring pistons if these
are used. "

[sam]

OH YEA, I'm sure a nice set of Turner pistons would be "kick ass" in a 25

I doubt you would find any difference. Some Turners have a lower shoulder on the crown on the exhaust (same effect as raising the port), some do not. Some are 3 ring, some 2 and some are single ring, but I have yet to cross paths with any cut for L or Dykes wedge shaped rings....that doesn't mean there aren't any out there somewhere. John Snell would be the true expert on this.

[David_L6]

Sam,

One of my Quincy built B Mercs had Turner pistons and L rings. I didn't like them - motor was hard to start.

The last set of pistons and rings I bought from Quincy were single ring Turner pistons (~.050" over) with a very thin ring. The rings had a lot of tension and I think had a chrome face. George Stillwill has those now. Maybe he'll see this and tell us what they were/are.

I don't know if the pistons I was getting from Quincy altered port timing or not. At the time I was buying them they were probably just selling off some old alky stuff that they still had laying around so almost anything is possible.