420 racing parts


New member
where is everyone getting there predator 420 parts from? looking for a mild build just doing rod,cam,springs,fuel, exhaust. do most 390 parts swap with the 420's?
Between PFM and Parsons I got everything I needed, mine is fairly stock though.
Bore and stroke are bigger on the 420cc, most of the 390 parts fit otherwise.
Head gasket needs to be for the 420cc, 390 is a smaller bore and therefore firing ring.