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Will a B20F Head fit my B18?[ALL/1998] posted by Fred Boudreaux on
Saturday, 3 May 1997, at 8:47 a.m.

Can anyone tell me what problems might be encountered trying to fit the head from a B20F to my 1967 vintage B18? If a B20F won't work, would the head from any other B20 be a better choice? Possible problems I've considered include valve-to-piston clearance,push rod length, compression ratio,water pump mounting and head gasket compatability. Will my B18 inlet and exhaust manifolds mate up to any of the B20 Heads?

I'm not interested in extracting any additional horsepower, and a slight increase in fuel consumption due to reduced compression ratio would be acceptable. My main interest is in trying to use locally available parts.

Any comments on these or other problems I've overlooked will be appreciated. My e-mail address is [email protected] Thanks for your help, Fred Boudreaux


Re: Will a B20F Head fit my B18?[ALL/1998] posted by Theddy Cassaras on
Saturday, 3 May 1997, at 4:09 p.m.

The B18 head is possible but not recommendable. The B18 engine had carburator, while the B20F had fuel injection. You will probably get problems to find the right head gasket, the fuel consumption will rise considerably and you will loose effect due to the lower compression. Here in Sweden you can easily get a good used head with new valves for about USD 60,oo, maybe it's more difficult where you live. Still, the freight cost money too, considering the weight of the head.

Theddy


Re: Will a B20F Head fit my B18?[ALL/1998] posted by Jim McDonald on
Tuesday, 6 May 1997, at 4:56 p.m.

Yes, it will bolt right on. If it's a later[K-Jetronic] head, you won't even have to plug the injector holes; otherwise you can get [7/8"?] soft plugs. Use a B-20 head gasket and a B-18 manifold gasket with the B-18 rings in the intake ports[to locate the manifold]. The compression ratio will be somewhat lower, but you'll have larger intake valves. The valve stem seals are better, AND the exhaust valves are stellite faced so unleaded gas won't hurt the seats.


Re: Will a B20F Head fit my B18?[ALL/1998] posted by Jim McDonald on
Tuesday, 6 May 1997, at 4:57 p.m.

Yes, it will bolt right on. Use [7/8"?] soft plugs to plug the injector holes. Use a B-20 head gasket and a B-18 manifold gasket with the B-18 rings in the intake ports[to locate the manifold]. The compression ratio will be somewhat lower, but you'll have larger intake valves. The valve stem seals are better, AND the exhaust valves are stellite faced so unleaded gas won't hurt the seats.




 


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