If I was interested in going fast all the time, I'd put something else on. My car isn't a race car.

I feel that I've already proven that the STR-12 isn't junk. I'm getting 3mpg better gas milege with this vs my Home ported M1 single plane with home built 900+cfm carb. That old combo had no issues and was tuned very very well, both at the track and on the street.

This intake setup was worth 3mpg / 2mph and about .2 et over the old combo.

This is in the same car, same track, same conditions.

I'll stick with it for now

Larry,

You may not have to modify your linkage and get new studs. We used to run an STR-14 on our N/SS car. An old Max Wedge guru from Jersey turned us on to a thin, gasket-like spacer that is made of plastic. It is made by Comp Cams (of all people). It is part number VH301. This spacer has the 4-hole top, but it extends into the manifold ceiling. They are roughly as thick as two gaskets. They are non-detectable in appearance.

Great car. Manifold makes it one-of-a-kind. Don't change a thing. Send me a PM with your e-mail address and I'll send you pictures of the gaskets. I have no idea how to fix my digital camera to take pictures small enough to post on this site. Tom

Thanks,....I was dreaming of something like that. I'd like to see one.

PM sent.

Larry, back in the early 70's I drove my Max wedge car on the street with the factory solid lifter cam and cross ram. The thing was an absolute pig below 2,000 rpm. My dad was a finish carpenter at the time & made me 2 3/4" thick 4 hole spacers. He liked to fool around with his carving & shaping tools and if I remember correctly, these things were almost shaped like an HVH supersucker. They did not cure all the ills of this setup but it sure did drive better on the street. Hope this helps,please don't change your car. It is one of the most cool & original cars I have seen. Randy

Lar,

You know the issue here is becuase you went to the stick you're now pulling the load at 1700 where with the auto you were simply slipping the vert which gives the throttle a bit more unloaded velocity (like rapping the throttle) to overcome the bog.

A little more timing could help and maybe a bit more tweaking of the pump shot and cams, but you can see by the design of the intake each carb is sitting over a fairly big plenum so with a big cam and light load you're going to have some areas of the part throttle powerband where the pulses are in "no man's land" and you'll get the symptoms you describe. The other thing is whatever band aid you use to "fix" the part throttle may negaitively impact the rest of the powerband....not necessarily, but pretty likely.

Also remember the popsicle sticks were designed around an old school 340, so the symptoms you desribe would be at a proportionally higher RPM....the STR's were designed for WOT drag racing and have a high RPM tuning length, the reason it works so good for you on the street is all the extra cubes.

I just got the 1" thick 4 hole spacers on there,.......No Change!

Same exact thing is happening.

Update,
Made large sheet metal dome under each carb to direct the fuel and reduce volume. Pretty sweet job, if I don't say so myself. Took a great deal of volume out of the intake, and keeps the fuel from puddling directly under the carb in a large dead area.

No change! Still bucks and kicks as it always has.

SO I've done the following and noticed no change:
-Played and played and played with carbs, with A/F monitor hooked up. Went Rich / Lean and everyhwere inbetween. IFR changed, IAB changed, Open rear blades more than front, vice versa,.....
-Timing all over the place from locked out low / normal / high. Curve from BTDC to very little...all maxed out to the same 35 degrees or so.
-Changed the intake shape a bit to aid distribution and signal to carb, taking volume out
-Added 4 hole spacers 1" thick
-Increased valve lash about .006"

Nothing has changed the problem yet.

Cam too big? 260 @ .050 on 110LSA installed at 106 Solid fast ramp.

There's a book out called "Camaro- Untold Secrets" that has a chapter dedicated to Chevy's crossram, which is very similiar to your STR-12. I'd get that & study it for some more ideas. While they were dealing with a much smaller engine back then, it'll at least give you some ideas.......

Attached is my solution to the fuel distribution issue. I made thick aluminum 4 hole spacers that bolt to the manifold with countersunk bolts, & turn the two 650 Carter AFB's 90 degrees (idle screws over the valve covers), which spreads the primaries over the ports better. Re-designing the linkage was a bit of a challange, but I think it was well worth it. Starts easily, cruises at low speeds & rpm, then hits hard & pulls to 7400 rpm.
Motor is a 470 low deck, 11.25 comp. with a relativly mild Scott Brown solid cam.