we have several 4AG and 3SG heads that are being rebuilt at present. We also now have limited stocks of really nice 1 piece race valves for both 3S & 4AG engines at what we think are sensible prices. Please call or email if you have any interest.

adrian, the dynos are not repeatable enough to try to compare engines to within a few kw. there are simply too many variables. i do not find pod filters do anything and sometimes their design makes for flat spots and resonances. the only ways to get more power are to add more air/fuel by changing cams and/or max revs. adding the pod filter and/or exhaust will not necessarily admit more air