[The Mad Porter]

Detonation likely aggravated by oil contamination of the intake charge.
If the piston tops are mottled like an orange or eroded that is more evidence.





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
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[The Mad Porter]

You may be right. There was a substantial amount of oil sitting in the intake galley pan.

Oil in the valley pan is normal.
By contamination of the intake charge I mean oil getting past rings and into the chamber where it kills fuel octane.







Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine