While I do think helicoils would be nice. I want to point out that my experience with the KRE D-ports has not suffered by not having helicoiled fastener holes.
I've had the heads for 10 years at this point and haven't had a single issue at all with the heads as supplied by KRE. Spring pressures around 145 on the seat.
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-Jason
1969 Pontiac Firebird
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