SlickVert

iTrader: (5)

Who makes Piston for 347 to match ET 11 degree heads?

ty_ty13

iTrader: (42)

lme was going to have to fly cut them themselves.... so i dont think any one makes a piston to match the valve of the ETP heads.... yet

JZ'sTA

iTrader: (23)

JE/Diamond/Ross/CT/Weisco (weisco isn't out yet though.)

ty_ty13

iTrader: (42)

really they all ready have the reliefs in the center?

i had no clue these guys where on the ball that fast... impressive..

Phil99vette

iTrader: (11)

Diamond has developed a 11 degree -4.29cc relief for their custom pistons.
Phil

Steve Burger

iTrader: (33)

Diamond better. I ordered a set for a 13:1 Compression engine.

Beast96Z

iTrader: (21)

I have no clue what is taking Wiesco so long. I've been waiting so long it rediculous.

Solid346

i know Wisco does, and i heard they are the only ones right now who makes a perfect 11 degree pistons

dame

iTrader: (3)

are you saying that you HAVE to have a special piston to use etp 11 degree heads?

Beast96Z

iTrader: (21)

As far as I know, they are the only ones that have scanned the 265cc chambers. Plus, they aren't even out yet. I've been waiting for months.

No, but if you plan on getting into the reliefs, they will need to be cut at 11*, just like the valve angle. Most won't ever get that close with the added clearence you recieve from these heads. The 265cc heads do require custom pistons because the intake valve is actually offset.

99whitews6

iTrader: (2)

So what about 240cc heads? Do they require anything special(I have diamond -2cc pistons)? Anyone know if they are available?

Jimmy P

iTrader: (177)

So my JE pistons with -2cc valve reliefs are prety much pointless with 11 degree heads?

Nate_Taufer

iTrader: (1)

Please re-read post number 10.

Nate

Cary@Perf-Induction

iTrader: (1)

Most of the piston manufacturers have the valve positioning for our heads. The 215 all the way through the 265 ALL have the same valve locations. there is nothing different about the 265. It takes a very small chamber and a pretty big camshaft to even have P To V issues. the valves are very close to the edge of the valve relief towards the center of the piston with a standard 15 degree valve notch. If someone were building an engine with 15 degree pistons and have a clearance issue, they can just move the notch over about .060 of an inch. It does not require a special piston. Jason, the reason you have been waiting is because of a dometop (i believe, that is what brian at weisco told me), that could be avoided by milling the heads.

Don't let the 11 degree thing scare you guys, they only need a custom piston in an exteme condition, at that point you would be making pistons anyhow. All the modifications that would have to be made are very simple if you have a very radical CR or camshaft. We have seen very few people who have even needed to clearance pistons. We do have a cylinder head out there that people are using with the Isky tool and making notches that way.

Beast96Z

iTrader: (21)

Cary, my pistons are a -13cc dish, not dome. I found out the problem from Erik today. He hasn't even recieved the head sections yet. Another shop close to them has had them for over a month and hasn't done anything with them. So, in essence, my pistons haven't even been ordered yet. If you know of a quicker way for Erik to get me some pistons, please let him know. I've been waiting for A WHILE! Also, if the valve locations are all the same on the 11* heads, why the custom rockers on the 265's? Something is obviouslly offset, but I guess I'm not thinking about something.

GPowrie

Jason,

I guess I was 180 degrees off. I know Weisco was getting info from someone else, but we also sent them a head section a long time ago. what happened from there, I wonder.

The offset is on the pushrod in the 265. we moved it away from the port to get a straighter shot down the port.