The guy I am rebuilding my engine with is use to Chevy engines and thought there should be valvespring seats(or at least shims).
You should seriously have 2nd thoughts about using this guy. Or at least hand him Jim Hand's book on Pontiac motors. There are other very serious Pontiac specific issues like interior oiling that need to be looked into. My builder may have done way more Chevy motors, but at least he was pretty darn "up" on Pontiac motor specifics. I just added to his knowledge (like introducing him to the BOP Vitron main seal, he was used to modifying Caddy seals) as opposed to trained him from scratch.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
