Anyone ever used these heads on a bigger cubic inch motor and had good luck?

 

They will make a great torque curve through the power band. Won't be optimal for high end horsepower though. Plenty of people have used TFS 215 heads on a 408. They wont make as good power as TFS225 or TFS235 but they will still work good IMO.

 

Yeah I've seen a few on 408s and have pretty good numbers. Just curious on anything bigger.

 

Its like anything, can you go bigger and make more peak power yes but if you have them already I would throw them on. Ive seen people use hogged out 243s and still make decent power on a 408, all depends on your budget. You could always sell them and trade up to the 225s or 235s, there are a few 225s for sale in the classifieds section.