My home inspection of Speedmaster heads

I have a single car 12 foot - 31 foot garage under my house and my shop is 36-28 but with 4 Duster’s between my son and I that takes a lot of space. If I’m putting bigger valves in a head I have a local shop that charges me 8.00 per seat to do any valve job I want but then again it’s a basic 3-5 angle cut with the head striped and clean ready to Machine. Good deal for me, fast money for them.