Piston top displacement stats needed
 

Does anyone know the displacement amount consumed/lost by the protrusion in the stock 502 pistons - je700

This is the top style I'm talking about since evidently they made several top styles even under the JE700 stamping

Its a very small dome. Its not much, I wanna say 3 or 4cc positive displacement. Same piston used in GM crate ZZ502, 502HT towing engine, some merc 502's, etc. Its GM part #12533507, just made by JE for General Motors. Typical 502 with 118cc chamber heads, .040 head gasket, usually ends up around 8.75:1 ballpark.

I thought the small domes were 17-19cc

Seaford,

The JE700 nomenclature is a forging mark, not a volume/part identifier. The dome volume is +4 cc, minus a -3 cc valve relief, yielding a net crown volume of +1 cc.

Bob

Yeah what he said^^^^ :)

Well **** Bob, I was trying to find this information out to give to you!!!!!!

I thought I'd call you as a bundle of information and you'd be all impressed and you went and spoiled that..... Haha

Left you a message late afternoon. My crank is in, and I've got the piston in to give you any other measurements you need.

Eric

with the carbon on that piston its more like +15cc's lol


http://www.jepistons.com/Catalogs/SR...placement.aspx

Hahaha.

That one was in the set that was trashed

Kind of off topic question. Did the motor that piston came out of have a thermostat in it?

Yes and a bunch of injectors that were WAY out of spec