webers

two89w · #1 (**permalink**) 07-16-2002, 05:07 AM

i have a 347 windsor currently running 44mm idf webers which are too small,should i use 48 or 52 mm webers,engine specs are,10.2comp,solid flat cam 560lift 294adv 248 @ .050 110lobe sep,windsor snr alloy heads inlet/309cfm @ 0.700lift exh 209.2cfm @ 0.700lift,1 3/4 4 into 1 headers

rlearp · #2 (**permalink**) 07-16-2002, 05:40 AM

I have some 48mm IDFs on almost exactly the same motor, 342 inches but 10.6 compression. I have not set them up yet, so any specs you have on jetting etc. that comes out of this thread would be of GREAT interset to me. Thanks,

Ron

Cal Metal · #3 (**permalink**) 07-16-2002, 07:32 AM

Weber never made a 52mm but the 48mm will work fine. Stick with F7 etubes, 200 air correctors, 150 mains, 55 bypass, 65/120 idle/holders, 37mm-40mm chokes if you are looking for street use. These are starting points--jetting anyway, but should get you there. Remember you will have better throttle response with the smaller choke (37mm) than with larger ones. Trade off between performance and streetability.