Carb options BBQ sauce??? The gas engine's rebuttal to Canola in the
fuel tank? (ad in the paper under the block)
Looks like the coated turbo valves. Cracks look nearly non-existent! :)
The valves I've seen that were bad were worn about .003 on the diameter
near the bottom of the stem. Takes a mic or decent caliper to check.
Loren