Okay...... clearly a non-symmetrical valve pocket arrangement in that piston.

I’d be getting out the clay....... and also checking to see if the valve that made contact is now bent.

Something definitely out of wack. Did you have that motor built or buy it assembled used ? Sure looks like that piston used to be in the wrong hole. Is the short block still together ?

I bought the short block assembled, it was brand new, pistons have not been out.
There are witness marks on 4 or 5 pistons. Machine shops is going through the heads, checking valves and springs.

Engine is apart now and as soon as I can get pistons picked out, going to call PRH for a roller. There will be clay going on the new pistons.

How many guys have put TF heads on 440 Source kits? Has anyone else seen a mismatch in the pistons like mine are?

The pic of the witness mark in that one piston is way way off.
Are the other witness marks located in about the same place?

I have sold several stroker rotating assemblies with Icon pistons, no reports of any v/p clearance issues.
Big variety of heads have been used with them.

Since these aren’t motors I’m assembling, I don’t know how thorough the mock up and inspection is.

I saw this pic posted a while back......
440 Source 512 low deck kit, Indy 440-1 heads(bigger ex valve than the TF head).

From what I can tell by judging this one pic...... at least from this angle...... it doesn’t appear that the exhaust valve is centered in the pocket all that well(but I def wouldn’t consider it a definitive answer), but the valve doesn’t seem to land outside the pocket.

That's way harder than a witness mark. Aluminum does not bounce back from being struck the way steel sometimes does.

@440sourcedotcom
Do the pistons in your new 4.375 stroke kits clear the exhaust valve radially for the TrickFlow heads?

Edelbrock BBM heads use a 2.14 intake and 1.81 exhaust valve.
TrickFlow uses 2.19 and 1.76 exhaust. Both share the same standard layout, both work with those pistons.
So there is more clearance with the TrickFlow on the exhaust and less on the intake

That picture showing contact is of cylinder #3, it is the exhaust valves making contact.

The engine was mocked up with Stealth heads, they fit fine. When I got the TF heads, I was using the same thickness head gaskets, cam lift, and rockers, so I never re-checked PV clearance, so that's on me.

Seems like someone else with a 440Source kit would have run into this, not just me.

I'd be happy ordering the 4cc Icon pistons, if I could get an answer whether or not they would need to be reworked.

Ok, unless the valve is bent, the rod is bent, or that piston was machined wrong, those pistons will work with those heads.
I better be right because I have 2 of my own motors I’m putting together with icon pistons. One has edelbrock heads and the other TrickFlow. You only need to put that head back on and use clay like was suggested. Even if you remove that spring, check that the valve is not bent and push it down into the clay by hand, you’ll know if it fits the pocket
Stealth is the same as Edelbrock 2.14 and 1.81, so there is more room for the exhaust valve with the TrickFlows.
All 3 have the valves in the stock location
Then you’ll need to clay it up, like fast68 suggested and check with your new cam

http://store.440source.com/Pistons/departments/7/

The over rev incident was early on, ran it 3 more years before this tear down.
There is nothing bent that would make multiple valves kiss pistons, except maybe my wallet.
I am getting new pistons either way, just on the fence about how high to go with the compression.
Thanks for all your help!

https://m.facebook.com/groups/zzcbot/permalink/1957665267704661/?anchor_composer=false

Just came across this. It’s a 522 (.040 over) short block with a 440 source kit and flat top icon pistons.
It had TrickFlow heads on it. TrickFlow hyd roller cam.

I seen that on FB.
Wonder where the exhaust valves were on his pistons.
As I recall, he just bought the car and tore it down to sell.
Not a bad deal, if it were all kosher.