Darkspeed wrote:Thought it worth metioning that the 32/36 is not exactly a tweak - it flows less than the original SU's
As a comparison the 390 Holley flows 390CFM at 20" WG - the 32/36 flows 203 CFM at 20" WG
The 38DGAS is the one to fit which can be modified to flow 318CFM at 20"WG.
You also have a progressive choke arrangement and unequal choke diameters facing the inlet ports to the manifolds - not a good performance combination
The stock 3.5 needs a carb capable of at least 300CFM@20" really, a stock 38DGAS would not get you all the way there but it would be a good start.
Andrew
Dont worry, a lot of people make that mistake, it is a huge improvement over the su's and much much better suited than a 38dgas
i replaced a pair of hif44's, that were ported to within an inch of their life, in fact they flowed so much air i couldnt keep the idle below 2000 rpm regardless of what i did! well except much stronger springs and that stopped the snap acceleration.
The intake sees both sides of the carb as i opened the dividers in the manifold to make an open plenum, therefore get the best of both worlds, i get good low end torque with good vacuum until i give it WOT where it sees the whole carb and full power, the 38dgas was way too large in this scenario and gave good top end power, but very little below 4000 rpm, so wasnt a good compromise at all.
plus its better on fuel and the weber is far less "agricultural" than a holley, they are much more refined in their operation, plus i had one (that one!) spare off the 1600gt engine i took out!