When I put the new carb and intake, I was unable to fit the stock manifold vacuum outlet to the intake. So I plugged the hole, and was able to get vacuum off the carb. The problem is, it must not be enough vacuum. The tranny will not upshift unless I either shift it manually, or I give it full throttle. The car HAS to be going 45 to shift to second, an 65 to shift to third. Unless I shift it manually, and even then the engines gotta be up at 2100 RPM.
Also, It's not like the tranny stays in first gear til 45. If I drive it slow, up to whatever, and let off the gas, RPM's return down to idle speeds. So basically it slips or something..
Do ya'll have any suggestions on how to get aroud this? I'de certainly appreciate it.
well i've seen electric vacume things for sale in the jegs book i think. They are used for if you have too much cam and no vacume so i bet this could help you. What is your brake setup? power brake booster or just manual
------------------ OWNER OF 66 CHEVELLE MALIBU
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It's got Power Brakes, which work fine off the port from the Carb... It's just really tight back there, I was wondering if there is something else to do. I also want to buy one of those adjustable vacuum modulators from Summit..
Jegs sells the adapter so you can use a holley on the performer rpm,its real short so you can clear the rear float bowl.part number 350-8096.$7.69.good luck Dave
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team chevelle#196
69 turbocharged 350
texas
Just a thought but I accidentally plugged my modulator line in to a ported vacuum hole that was dribbling vacuum at idle(very low but tricked me) and mine did what yours is doing. ie.. only getting enough vacuum to shift at "ported rpms" ??
just a thought
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Dave Harvey
'85 Grand Prix
Chevelle Waiting
Hey, Thanks Turbodave, I'll check that out, cause that's my problem..
68 Malibu, I'm getting vacuum for the modulator off the carb, in the front, right next to the timing advance port. It's a TH350.
JoeY Yes, I did have a 2bb, and yes I hooked up the kickdown linkage. I bought one of those universal Throttle/Kickdown brackets and it appears to kickdown right at the end of full throttle..
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