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Old 06-02-2012, 04:51 PM
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pontiac 461 w/ edelbrock 1407 carb issue.

my pontiac 461 stroker is just broken in at about 5-6k miles on it. it has an edelbrock performer rpm intake manifold on it and an edelbrock 1407 750cfm carb. my issue is that it will idle really really weak no matter what jets rods or springs i use. the changes all affect the diff rpms and so on. but no affect on idle. also taking a right turn brings about a healthy sounding idle and will raise idle by 800 rpm or so. hitting the brakes has same affect. btw distro is mech advance and brakes are not boosted

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Old 06-02-2012, 05:04 PM
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also under load accelerating to 5200 rpm it cuts out like it has a rev limiter or something and runs rough for a few seconds while i blip the thottle to keep it afloat and then smooths out. pulling through all three gears to 110 pulls hard no issues as long as i shift at 5100. it just wont idle after a hard pull, and at 5200 motor cuts out and feels like i slamed the brakes
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Old 06-02-2012, 07:39 PM
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My first thought on your engine "cutting out" at 5200 is valve foat. As the valve springs are used, they can loose thier tension over time. If this is the case, I would replace them, or if the springs are not rated for your cam they may be allowing the valves to float. Not something that you want to happen, because if one tags a piston, it could be catastrophic.
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Old 06-02-2012, 07:51 PM
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Yup

Floatin' the lifters. Besides, at 5,000, your probably over the torque/HP curve anyway. That ain't no Indy engine, ya know...

As for the irregular idle/etc., double check your float height adjustments (in your carb)... Pull it all apart, get a rebuild kit, and follow the directions to the teeeeeee... she'll run just fine.
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Old 06-02-2012, 10:27 PM
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k, i'll just stay below 5200. ive adjusted the float up and down and dead on. no change, carb is brand new and just the primary side is bigger than the old 1406 i have that never gave me any problems. whole motor is new actualy... my biggest thing is that it responds to right and left turns very diff
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Old 06-03-2012, 08:08 PM
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What heads? Cam? Exhaust? Who did the work? Is it a 455 bored or a 400 stroked?

750 CFM is not enough for a 461 Pontiac. It needs an 850. The E-carbs aren't usually up to the task, either. Nothing like a good AED Holley... (:- RPM is an okay intake, but usually supplies a "rush" of low-end torque that wreaks havoc on traction. It's "big" enough, though, to rev a 461 to well beyond 6,000. We generally recommend Torker 2. RPM seems a bit better on the 400-based builds. Another advantage RPM brings is the dual flange. If you can "score" a nice Q-Jet from the late '70s, and have it built by a "pro", you'll have the best "street" setup. Hard to beat Q-Jet for a combination of power and drivability. All the late '70s versions are 800 CFM, easily enough for 6,000.

Don't let the Chevy boys here rattle you about revs. They mean well, but haven't been looking while we've been "developing"... The Pontiac is just as capable of revs as any other engine from the muscle car era. It just needs the right combination of components. Now that "real" heads are readily available, it's easy.

FWIW

Jim
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