Paul I think these fit on the Racing beat manifold. I just e-mailed them to find out what the bolt pattern is, It specifically states that it is a weber replacement for the rotary. they can also make them with two injectors per throttle body. THAT'S GREAT!!!!

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=013&item=230019159281&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1

Tony

Place this at the top of the long pipes near the plenum cum scoop
Otherwise the built in butterflies will disturb the organ pipe
tunning effect. You really need four injectors for safety
and staging with Tracy's system.

Paul Lamar

>
> Paul I think these fit on the Racing beat manifold. I just e-mailed
 them to find out what the bolt pattern is, It specifically states
that it is a weber replacement for the rotary. they can also make
> them with two injectors per throttle body. THAT'S GREAT!!!!
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=013&item=230019159281&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1
>
> Tony


It does have four injectors. You just can't see them in that
 view but on the ebay listing you can clearly see the other two.
Tony

Looks good and will work fine. Is it 48 mm or 51 mm ? Big bucks
however without the injectors and base extensions. $250 is more
like it. It will also be slightly less power than with one large
3 inch butterfly. You will still need to build base extensions for
it. What sort of machine tools do you have access to? Got any stock
Mazda throttle bodies lying around?