Some "Dime Rockets" for the 4TH!

[Mark Yacavone]

Originally Posted by joe huestis

Been looking at some of these U/SA combos such as the late 70's Camaro with the 305-2V and the 80's combos with the 267-2V . At 180 HP vs. 150 for the 267 is it worth carrying the extra 600 lbs. with the 305 ? Which is the better combination and what other chevy combos may be the way to go for U ?

Almost have to go with an 82 Monte 267...That's a lot of weight difference for sure.. Not quite in the Ford 302 range though.
For some reason though, the 1.21 Dual Jet doesn't seem to work as good as the 1.18 2GC ???

[Dwight Southerland]

Originally Posted by Mark Yacavone

For some reason though, the 1.21 Dual Jet doesn't seem to work as good as the 1.18 2GC ???

It might have something to do with the 2GC having 1.686" throttle bores.

[Mark Yacavone]

Kinda what I was thinking...Not being an engineer, I don't know if one restriction in a carb over rides the other or vice versa..
Could have something to do with the booster/ venturi cluster being bigger in the Dual Jet...Seeing its part of the bowl casting, you are stuck with it.
Take a look at what some of the fast 4 GCs are using...

[Dwight Southerland]

Yes . . . what some are doing.

Back in the day of modifieds, they would use the body of a Holley list 4224 660 cfm carb fitted to an 850 double pumper base plate. The carb body would be reamed from the bottom to match the 1 3/4" size of the throttle bores. Voila! The new "blended" carb would flow in the 750-775 cfm range, but keep the small venturis for crisp throttle response and high quality fuel atomization for under 300 cu in engines. I suspect the difference between a 1.686"/1.093" carb and a 1.686"/1.186" carb would not be as great as one would fear.

[Billy Nees]

From what brain cells that I have left, I seem to recall the 1.21 Dual-Jet flows about 290 CFM, the 1.18 2G about 320 CFM, the small-base 1.092G about 260 CFM. I've never played with a large-base 1.09 2G but I will assume(there I go ASSuming again) that because of it's larger and better shaped airhorn it would do better than a small-base 1.09.