Flat top pistons

[ChrisZ]

Hi all

I'm out looking after pistons for my L24, i have sourced down a supplier with very interesting prices, they have 2 kind of flat tops, the one with valve relief's and the other without.

The seller say that the one without (Ry 2516) is for 70 - 72 and the one with relief's (RY 6335) is for 73.

My car is a 73, still i prefere pistons without relisf's

The only thing i can think could be the reason for the pistons having relief's is due to larger valves in the E88.

My question is, will the one without relief's work ? motor is bone stock, except of round top SU's and header, any input is appreciated.

Chris

Edited December 12, 2008 by ChrisZ

[d240zx2]

I'm no expert on this, but it seems that if you're running a stock head with stock block, the reliefs are there for a reason. My flat-tops (70) have owner-induced "reliefs" imprinted due to a bad cam install I did years ago. I'd hate to think you'd do the same thing from a different source....

Frank

[Zs-ondabrain]

How much is they asking and what all comes with the kit?

[Unkle]

Be sure your deck / heads are not machined for sure , even changing a blown head gasket by a previous owner could scuttle your plans!:surprised

[ChrisZ]

Deck is surfaced, but did Datsun ever come with relief's ?

I once heard that the relief's dont even match up with the valves, to me they are just less compression and more chance of detonation.

Dave a set is with pins and rings, price is $180 - 200 depending on model, http://www.coolparts.com/index.php?p=catalog&mode=search&search_in=all&search_str=ry+2516&x=0&y=0 you can look it up.

The car use to have reliefs in pistons, i just like to know if it is necessary or not.

Chris

Btw, Dave there is a thread about LED lights going on at HybridZ