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What is the difference in fitment between the b18c4 manifold and the b18c6?

Are there any other differences in the heads between the two engines, i.e. cams, valves, bolt patterns etc...
 

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Hi Dan, from what I understand the B18C4 and C6 heads are quite different, the manifold bolt patterns aren't interchangeable.

The head itself is quite different and there's a different spring setup for valves. Cams are different too although from what I understand all standard B-series cams are pretty interchangeable and the difference isn't much.

The biggest difference between those engines is the domed high compression pistons.
 
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