Thread: 289 Hesitation

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You guys did such a great job helping me on my holley, maybe you can answer this.

I have a 68-289. Mild cam, Edelbrock RPM intake, Holley 600cfm, headers to Flowmasters.

Problem is the hesitaion off the line. I can't even spin tire !!! This should be lighting them up. Once it gets past that point it takes off like a rocket.

Timing is set to 6 BTDC, Mixure is set with vacuum, Plugs look great. New cap, rotor, plugs and just rebuilt the carb and new air filter.

Transmission over-revs from second to third. (wondering if it's the tranny)

Any ideas? What am I forgetting?

Sorry, upgraded to Pertronix solid state ignition.

Sounds like the tranny is slipping on the between shifts problem. Is it a stock torque converter, and what gears are in the rear end??? Is the vacuum advance and cetrifigual advance working in the distributor??? What is your total advance and a what RPM is it all in?????

Stock transmission, vacuum advance is working, not sure of the numbers and pump shot is strong.

Idle is at 550 RMP

Vac is 16 steady. I haven't touched the tranny. How do you adjust a tranny?

Modulator was replaced with stock, powervalve was replace with one in Holley rebuild kit.

Cam is Edelbrock Performer Hydraulic
289-302 CID
1500-6500 RPM

Hows the accelerator pump?

Try a bit more advance, and richen the mixture slightly. Either one may solve the problem, or maybe both.

You need to determine when and at what rate your mechanical and centrifugal advance is coming in. Get (or borrow) a timing light with the advance knob on the back of it so you know what your timing is doing. Until you determine if the rate of advance is correct, everything else is just a WAG.

Ok, I will close this thread out.

Looks like it was as simple as too low of idle. Hooked a Tach up to it and it was running at about 550 RPM. Book says 650 for stock engine. Brought it to 700 RPM and she takes off.

Thanks to everyone, this is an unbelievable tool.