VCI logo Archive Index | Current Issue
B20 Head on a B18 Block?

I have a '65 1800S with a B18 and ipd Weber conversion. The engine needs a valve job, so I was wondering if it is possible to retrofit a B20 head on the B18. The fuel injection ports need to be plugged up on the B20, but should it work? Would the larger intake valves improve performance?
Seth Friesen

Phil says: Unfortunately, this swap is not a good idea on its own. You do not want to put large-diameter combustion chambers on narrower cylinder bores. On a B20 block (or a B18 that has been overbored to accept B20 pistons), using a fuel-injection head can indeed result in increased performance when used in conjunction with a proper cam, induction and exhaust system (and that's a huge subject!).

Back to the Top