Quote:
Originally Posted by effvee
Good morning. Concerning the early 2.0 heads, can anyone tell me if it is at all possible to build up these heads? Well what I mean is, since I have five and I am in the process of sourcing the sixth, I thought about getting the later 2.4 version or the later 2.0 heads with the shallow combustion chamber (I hope you all understand my meaning  ) I want to have larger valves install and do some mild porting work. I don't want a lot being as cheap as I am, so a little will do. I hope to go with 74mm crank and 90mm pistons. Would someone share with me as to larger valves, if this can be done. O the head must be cleaned and inspected in order to find out if I have not just bought someones trash  |
2,0 heads are just about the worst choice from a performance vs. dollars standpoint. Stock, they have 39/35 valves and wheezy little 32mm ports.
Sure, they can be CNC ported and have larger valves installed to resemble 69S heads, but you won't have much change from a $10,000 bill AND the heads will be more prone to detonation than later heads. Also you will have to have the mating surface cut, 84mm and later cylinders have a different seal that requires irreversible modification of the sealing surface of the heads. (but there is an adapter to go back).
There are no later 2,0 heads with the shallow combustion chamber-- all the early ones have a 72cc chamber and different valve angle. In 1970 the combustion chamber was revised, 68cc, and the valves were made larger.
What you probably want are a set of 2,7 heads that will work better with 90mm cylinders. They aren't that hard to find or particularly expensive. Good luck!