[Moppie]

Ok, all the crap you listed will get you at the most an extra 5-7hp if your lucky. Maybe not even that.

An engine makes its power by burning a combination of air and fuel. Basic theory is that the more air and fuel you burn the more power it will make.

So it follows that if really want more power your going to have to burn more fuel, which will affect your gas millage. How much depends on how much more power you want.

A b20 has a horrible rod/stroke ration compared to a B18. Its simply not designed to rev, or to make lots of power.
Neither is a b18b, but since its closely related to a b18c its has more potential than the b20.

Adding cams could easily get you an extra 25hp on thier own. But that much of a gain will have a lumpy idle, and poor economy.

A gain of say 15hp from some milder cams, will retain a good idle, and if your gentle with it ok economy.


But if its performance and economy your after, then you really need to think about a B18c swap. Driven slowy it will give you the economy you want, but when opened up it will give you all the performance you need.


However with only a raised c/r and some p&p on the head of a b18 or a b20 you won't be beating much. In fact for the money you spend on doing it, your likly to get nothing more than a few laughs.