Did it damage the head?
I hope not

that "notch" in the piston looks like a break not a burn. not enough end gap?

I have done a few of these on the dyno, but they seem a little different, they had 4 wires, 2 to MSD, 1 hot and a tech output, along with the vacuum line. Also those were set @ 10 BTDC before we turned on the timing table.


Joe

Cab, both heads have what looks like erosion where the fire ring sits. I have to have them welded up and resurfaced. The Cometic MLS head gaskets look eroded in spots too. It's likely a combination of trying to get too much quench and detonation, but I can't figure it out fully. Hoping these changes eliminate any problems in the future. I didn't look at the ring to see if they butted. I will now.

I suspect the pistons were rocking and my quench clearance of .035" was a touch too close. Didn't really see any signs of contact though??? I ordered slightly oversized pistons with a touch less compression heigth and will have the block honed to fit them.

I also had the block resurfaced about .006" to clean it up. It wasn't properly square decked, as there was a .003" slant to both decks. Me thinks the original fixture was off on the previous build. Ordered new pistons. All the bearings looked brand new thanks to the Jomar 100% no bypass.

Looks like ring end gaps too tight.

Used them on my 11:1 compression 451 stroker with B1-BS aluminum heads and never had a problem.

that is the same head gasket I use in most of my BB Mopar stroker motor pump gas builds
My old pump gas 517 C.I. Duster motor made 687 HP with a set of Eddy CNC ported RPM heads on Oregon pump swill on a DTS engine dyno in Klamath Falls ,OR at 4300 Ft. above actual sea level, I switch heads to a set of Indy SR Max wedge ports and those heads made 727 HP 2 weeks later with every other part the same including compression ratio, intake and carb, camshaft, lifter and rocker arms
That motor had 10,78 to 1 compression ratio and a Indy400-3 intake with a Holley List 3 9375 1050 CFM Dominator carb, Comp Cams solid roller cam that was 260@.050 with .420 lobe lift on the intake lobes and it had 266@.050 on the exhaust lobes with .409 lobe lift Harland sharp 1.65 ratio roller rockers
My message is those are good head gaskets for pump gas street motors with less than 11.0 to 1 compression ratio