Reply to "351c Weber"

If you are planning on IDA's...those are stock at 48mm . I also looked into IDF's that as I recall are a little better for low RPM, I think they have an additional circuit. Depending on what you are doing you might also want to reduce them down to 44's or 42's. I ran 44's & 42's on a vintage McLaren with a 360 Chevy small block that was setup for the track. Although it had the best heads the Chevy racing division could come up with I'm not sure that they flow as much as a 351c port? On a 302 for the Mangusta you are going down roughly 16% in cubic inches you might want to go to 40-42's if they are available. It depends on what kind of driving you are doing.

They are fun to jet, learn as much as you can about the different circuits and have fun if you do it yourself...they are a blast once you get them close. You have to have the vacuum guage to set the individual throttle positions or you will never get them to work right. Buy a Webber drill set and have at it. For the Mangusta, there are quite a few 289's & 302 with that setup so you should have an easy time with them.

Here is a forum thread from a few years back that will probably help also:

http://pantera.infopop.cc/eve/forums?a=tpc&f=5650045562&m=9750043874

Check out this link:
http://www.gt40s.com/forum/gt40-parts-sale/26246-weber-...89-302-manifold.html

Someone is selling what looks like a full setup for a 302 that should work for the Mangusta for 1950 Euro...about $2500 US. Sounds about right and it says it already setup.