I picked up an Edelbrock 6 2bbl crossram intake with 6 Rochester 2G carbs and 1" spacers for a small block chevy. Its currently set up with non progressive linkage. I'm planning on using it on a Metropolitan Gasser project. I would like to build an engine around this intake. What would make this perform to it's maximum potential?
Having a friend that does a lot of top end motors for the go fast boys build my 383 SBC balanced roller engine around my X1 with EFI . 2500rpm to 7500rpm range. Modified Corvette 'D' port angle plugged alloy heads, 2.02 / 1.60 valves in lieu of 1.94 / 1.50 valves, 58cc chambers, 10:1 compression, screw in studs with guide plates, steel crank, forged pistons and 'I' beams rods. Howards cam with springs, stud kits top and bottom. SFI flexplate and ROMAC balancer. Dual exhaust Fentons will most likely strangle performance a bit. Using a quality ignition system, coil, distributor and leads. A standard HEI won't fit. Manifold hasn't been port matched so far however should be good enough for what I want to do. In 1962 Vic Edelbrock Jnr pulled 375hp from a 283ci motor fitted with an X1 and 6 x 97s.
Out of curiosity, what kind of numbers were you looking at and did they modify the intake ports at all? Curious if the intake manifold was opened up from the stock 1.20"x1.94" port exit.
Builder indicated 450hp engine, manifold is untouched OEM and not port matched to heads. He would tune it on dyno before going into car. I was of the thought that big ports do not necessarily translate into big HP on the street unless in the high RPM range and flowing enough CFM to justify opening them up. All I know is that he flows the heads on a bench after unshrouding the valves and porting etc. Exhaust headers are cast iron and you can only do so much to them; I thought of that abrasive paste under pressure to clean out the casting flash however unsure if anyone can do it around here.
I have a X-1 intake and was thinking of going the Rochester route. You wouldn't happen to know what Rochester would work best would you?
I was thinking of just running two carbs in the middle and dummy up the outside four? Is it worth a try or just a waste of time?
I ran all 6 with non progressive linkage on a 350 with 041 heads and 292 siamesed cam with a M21 in a 4100 lb car, it bogged a lot under 2500 and took a bit to get it to smooth out by 3k. 2 would work or 4 would work, how much tuning do you want to do? Progressive linkage and run all 6. Stromberg 96s or 94s are a lot smaller than the big Rochesters.
That's the thing.. i don't want to do much tuning! How many cfm roughly do you think you are running?
Get a board and mount 6 gauges. Tuning isn't that problematic. Jetting is the ass pain... once it's set you don't need much maintenance to keep her going. No different than an old CB750 with 4 carbs
Most of the Rochesters were designed to run a I6 or V8 solo... the intake used the older smaller carbs for fuel.
I built a model A roadster for a buddy last spring, its got a basically stock 283 in it, we put an x1 intake with 6 97s on it, for now with the stock motor we blocked off the out 4, it actually runs super good on the center 2, throttle response is great, it will bake the tires off the car too, the motor might have a mild cam but thats about it, eventually we will be rebuilding the motor etc etc then we will work on putting the outer 4 on progressive linkage.
Sounds like that may be the way to start for me as well. Start with a few and work my way into them all and learn a few things in the mean time. Excellent
The Jalopy Journal
