To answer the question TEX013 on the big dual 4-s, this is some of Bens recent work.....Talk about flow...

Some reason you are haveing a really hard time understanding what I am saying. If a carb is too small then they run better with big plenums, that is exactly what you are finding out. A big plenum is a great way to make a smallish carb make power, I don't see why that is so hard to understand. Six packs are fine, I don't know why you think I am trying to convince you to get rid of it, if you want to keep it just keep adding plenum, I was just explaining why you keep picking up power. I even agree the mod man would be better for a 6 pack or especially dual 4s than it would be for a single 4 as the outside cylinders would probably get less fuel than the centers.

A57RT,
thanks again.the current dual 4 has 4 holes per carb.thanks for the link,i have seen those spacers on ebay in regards my mates 510ci six pack.
would that top allow use of holley type carbs on the modman ??
i would think a 1" 4 hole spacer may pick up signal over the open.
Dave i see and understand what you mean re spacer/plenum/carb size.i have done similar myself

Tex

Mark, that lid for holleys is NICE!!!

what Dave was trying to say is experimenting with plenum spacers would be something worth trying. I think your confusing carb spacer and a plenum spacer in the convertsation. stcking hole spacers to me would just increase signal to the carbs and posibly help atomization before it hits the plenum which i would think would be helpful with a center carb in the middle of the large plenum

Those carb spacers (even the hole type)are effectively adding to the plenum, I assumed everyone realized that. There may be other benifits from the shapes like atomization or fuel distrubution but the main thing they do is add plenum volume.

I dont really agree that a hole spacer is adding plenum volume. IMO it would just be adding length to the carb and would in no way make a carb seem larger to the engine as an open spacer would. this is just my opinion, in no way should i be considered an expert

I understand Dave, I took a break and re read things, im just dam hard headed at times.

As far as the carb spacers adding p volume as some feel it does add a little and as Ray pointed out in some ways it dont.

I have read both, but what I was wanting to hear I did about increasing carb sig. which explans the better throttle response.

Ray, that top plate Ben made is one of his first like that, its my understanding he would/will change a few things on the next one but as we emailed or pm-ed a good bit ago hes will to try anything and can move the carb spacing on a six pack plate.

Ive not seen many carb spacers work past a certain point so fo now Im just gonna run with whats seems to work well and as much as I hate to admit it yes two big 4-s would move alot more air/fuel I just wonder what it would feel like at lower rpms.