Great thread here. I just bought a set of 4V heads (D1AE closed chamber) that I need to take apart to see what has been done to them. Looks like the guide seals were changed but not sure if the valves are still OE, if they are OE I will be changing them. Interesting to see the mention of Alex's Parts in this thread, I was always surprised and frankly a bit leary that their prices are so low, yet the reviews (as 4VANDPROUD mentioned) were pretty good.
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.