i belive the type of cam might also play a part in it. my fatner had a mecanical cam in his engine and about 5 years ( volvo crate engine for a p1800) it it pounded in the valve seats while his old chevy with the hydraulic cam has no probles yet wit the valve seats.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.