i was told that the ports are the same between the 420a and the 4g63. not the flange just the exhaust ports. i want to buy a sidewinder manifold and put the rs 420a flange on it. i was told that it can be done.has any body else heard of this?
when i put the 4g63 many up to the 420a block the ports matched. they sell the rs flange on e gay. please chime in with your 2 cents any feedback is appreciated
thanx
kevin