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Re: b18a vs b18b
The b18b tb is slightly larger. The runner design is better (not much), and I prefered the b18b cams in the turbo setup over the b18a.
Also, there are other differences. The thermostat housing is different, there is an oil temperature switch on some of the b18a's (90-91)
Also a few little other differences.
When i swapped the b18b in my 91 LS, all the info I had been given was mostly BS. The power difference is nominal and the benefit would merely be the difference in mileage (assuming there is any.)
If you are running na, then you may notice a tad difference, boosted, the only real benefit is the **slightly larger tb and rumored better flow characteristics of the head.
Yes, all you need is the tb and IM gasket to install.
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