Snowman 51 book says 35 lb. is normal I put in those hard seats to burn propane.guides too,got seats from Goodsons put in 12 called them for more the guy says don't use for propane ! Well I don't think my engines know what they're burning,but been fine so far now the 9000 mile one still has soft seats in it. Think those seats are a stainless alloy,thought I would work my head over then install the fenton split,have a one barrel aluminum intake for it.
