@Corey Mcnulty are you taking the pistons completely out? That way, you'd get a better idea. The oily grime of just the dome doesn't reveal the whole scenario. I have pictures of mine from various angles, so we could compare if you had better pictures.

 

I didn't think there was a dispute, just confused by tag team posting.

The piston looks like it got really beat up hard to tell what it used to look like.

 

It wasn't supposed to be tag team posting. However, the initial writeup in the first post, wasn't entirely clear (e.g., he said "Second is suppose to be what it is" but should have said "First is suppose to be what it is." since my photo was first in his lineup). And once I found out someone nabbed my photo from Facebook and then gave a writeup that wasn't clear, I jumped in to take ownership of my photo and clarify the statements.

 

I meant the Bob & Corey team. I had a hard time figuring who was saying what.

 

Take a better picture of the piston in question. I have a set out of a motor I'm improving setting on a cart.



Correct LNF Piston

 

That is one wild piston top.

I would like to see the flame propagation from it.
Would be interesting.

 

All the DI GM motors that I;ve seen have a unique piston crown.

Here is some basic info, https://www.hotrod.com/articles/expl...ning-theories/

 

Interesting read.
The early design piston top remind me of Cat diesel engines I worked on. The ones just with the "dimple" in them for the swirl effect. There are pistons on Cat engines that have a cavity in the dome and have a raised point in the middle of that depression also. And yes the engine are DI.

 

so I do have the oem piston. It was just odd that these, and rizdon had diffrent pistons.

 

I havent got the engine all the way out to to take the pistons out.