question for carb experts?

[wrench87]

the guy at holley tech stated the 9381 has no changable air bleeds and has a old school fuel curve, the nascar 830 would be flat on the bottom end due to the circle track fuel curve.
he suggested the 82851 850 street hp?, i think blykins had it right and get a custom carb for my paticular needs. i like some of the aftermarket features like the billet metering blocks the sight glass for the float level, billet or stainless t plate. i need a vacuum source for the pvc, would also be nice to have a port to hook up a vacuum guage, i have not dropped the motor in yet so i dont know if i will have any height issues to run a 1 inch spacer.

[blykins]

I can get the baseplates with a nipple for the PCV...

[JBCOBRA]

I put the nipple in a phenolic spacer

Originally Posted by blykins

I can get the baseplates with a nipple for the PCV...

[blykins]

Originally Posted by JBCOBRA

I put the nipple in a phenolic spacer

Yep, and if you have hood clearance, that is certainly a viable option...

[JBCOBRA]

Mine just barely fits...
The phenolic is worthwhile too and solves the pcv valve issue.

[wrench87]

ok if you run a spacer they reccomend the 4 hole type where would you put the nipple? would it go in one of the rear holes or would you have to install it in the middle so it uses both holes?. i think they make a aluminum one but wouldnt that defeat the purpose for heat soak, i would think the composite would be best?.

[blykins]

Originally Posted by wrench87

ok if you run a spacer they reccomend the 4 hole type where would you put the nipple? would it go in one of the rear holes or would you have to install it in the middle so it uses both holes?. i think they make a aluminum one but wouldnt that defeat the purpose for heat soak, i would think the composite would be best?.

How much of the engine do you have finished? You may be putting the cart before the horse with carb spacer selection, carb selection, etc. I never put all of my eggs in one basket with a carb spacer and to make a generalized statement that "...this spacer will always work in this situation" is a great bit presumptuous.

I really wouldn't hamstring myself by having to have a spacer with a vacuum nipple in it. If you're going to buy a custom carb from someone, it's easy to just tell them to put all of the vacuum ports on the carb. Then you can mix/match spacers all you want....or choose to run without one.

[JBCOBRA]

....just use the big one-holer. Works great

[Barry_R]

The old school 830 seems to work very, very well in numerous applications. I've run several on the dyno with pretty good results. I use and sell a lot of Quick Fuel stuff and its also pretty darn good - just cosmetically different. For some guys that is important, for others less so.

I generally go big on carbs. I spent a few years working at Holley and I can make a big carb drive just fine - but have not mastered the art of making a small one "big".

[blykins]

Should be a fun ride....

When you going to do the swap?