Just a word of warning, there are least two (three?) different carby->manifold bolt patterns on 18Rs so you should try to get the manifold that comes with the carby to ensure it bolts up fine.
I got burned by this a few weeks ago, and then upon looking also discovered that there are two different carby 18R heads too (pre pollution and post pollution I assume). Have a pic here that might help, it shows an extra hole used for what I assume is the EGR/pollution setup:
This hole won't be covered by some manifolds so you would need to plug/fill it if you had a pollution model (not sure if the first was the RA40 or if some RA28s had this).
Bear this in mind, hope it saves someone the trouble I had. I eventually ended up getting a new head for it too - good excuse for a reco'd head, to check the internals out, and to give the engine bay a bit of a tidy-up
Sun, 12 September 2004 11:06
