Now offering machining services to match the cylinder heads to your bore to reduce the chance of pinging. According to the instructions provided by Ivan with his kits, over bored cylinders should have the edge of the combustion chamber in the head enlarged to 1 mm over bore size ( along with the head gasket ) to reduce the chance of pinging.
These are Jess' H2 heads I just finished
Machined

Fine emery blended and entire combustion chamber sanded.

I will need to know bore size so the correct amount of material can be faced off on the lathe. Extra fine emery paper will be used to knock down the burr from machining and I will go over the entire combustion chamber. ( Note, if there are excessive "hammer" marks in the combustion chamber, they will be smoothed but not completely removed )
Price is $25 per head plus shipping. Insurance can be added for actual cost.
I can be contacted thru PM or at JRDerstine
AT gmail
DOT com ( removed underscored items and replace with "@" and "." )
Thanks for considering my services
Jeff