Don Terrill’s Speed-Talk

You can go smaller on MJ. Try #70 MJ with IAB’s .070 HSAB’s .031

Heads: 3973487 Have accessory bolt holes at end of head. 1971 head with large chamber 75cc . Low compression/low performance Heads: 3947040 No accessory bolt holes . 1968 64cc chamber . performance head. Heads: 3932441 Check for accessory holes. 76cc chamber low compression/low performance Vortec he...

Wow. Interesting. Totally different metering block and same exact symptoms. Not sure where to go from here. Copy that. Will do I did notice that this other metering block dod allow my to jun a 72 jet and it did flatten my fuel curve a little. 3000 rpm at 70 is now at 14.5 and if I give it a little ...

You only bought the adjustable secondary cap , not the whole unit? So are you using the check ball? “Tuner” can tell you the disadvantages of not having the brass tube. This is what I would do. PMJ #74 IAB’s .070 HSAB’s .031 TSR .064 This is a must do. Secondary plates closed plus 1/8 turn or just s...

Your 950 AED is a 750 main body with an 850 baseplate that flows about 830 cfm. Correct me if I'm wrong. I assume your idle vacuum of 13.5 inches is taken with trans in neutral/park. !.75 turns out on all 4 idle mixture mixture screws is a result of the small .029" IFR indicating it could use a...

Some of the Chevrolet OEM Holley carbs used lower air bleed in primary venturi’s to control AFR. In the picture below you can see it goes to the transfer slot passage. These were used on 1969 396/375HP , 427/425HP , 1970-72 LT1 Corvette/Z28 and LS6. These are ones that I have worked on, but I’m sure...

Have you installed the .064 TSR yet? Or at least tapped it for easy install next.
Does this carb have the brass tube in the primary that I pictured ?

Did you buy this carb new? I would think this carb came with a quick change secondary pod not an adjustable pod like a Quick Fuel carb. Does this carb have a brass tube in the primary venturi for the secondary vacuum pod? (picture) You do not need a bottoming tap. A regular tap will work fine. Just ...

Yes throw those old intakes away , you have two choices left. Even though a Quadrajet is a great carb , I would use a Holley carb for the bigger primaries throttle response.

You should list your engine specs.

"It runs great but my plugs are black and I burn through fuel a lot."

I don't know what would be different about that carb to require a #77 primary jet. On a 750 I usually end up with about #69 primary jet along with about 68 to 70 TSR.

https://www.holley.com/products/fuel_sy ... rburetors/

click in stock

Or a solenoid that closes the throttle plates

I have a buddy that was telling me he was going to get some of those Holley factory refurbished carbs. Not the new models, but the old gold colored classic ones. Like the L-1850, and the 450 cfm type. He's wanting a L-3310 780 cfm, and a 650 double pumper. I looked at them and they don't have a war...

You won’t get good answers from those guys (Engine Masters) . First of all, run on or dieseling is caused by throttle blades open too far at idle given all else is correct. This is what I have. BBC Monte Carlo 500+ hp with iron heads used for street touring. I run a $300 2 core aluminum rad with wid...

F-BIRD'88 wrote: ↑Sun Apr 14, 2024 8:57 pm Change the mufflers. dynomax super turbos are not bad. Add tail pipes, exit at bumper or behind rear wheels.

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