Don Terrill’s Speed-Talk

Another thing. I never liked the Weber spring loaded STEEL needle & seats. Carbs hanging off the side of an inline engine are subjected to vibration/movement. Not good for maintaining a stable fuel level. Redline in Hollywood, California sell Viton needle & seats for Webers. Might be worth g...

The correct length is 0.690", all five brgs.

[1] One or two carbs on the engine? [2] Agree with others that chokes are too big. Big-ger choke does NOT automatically translate to more HP. [3] With such big carbs, only small throttle opening required for cruising. Are you cruising on the idle cct or main cct? Try this: remove the m/jet, E tube &...

Another combo you can try: smaller main jets, maybe 160 or 165 with 140 or smaller AC jets.

Water pump should be over driven 10-30%.

More info here: www.stewartcomponents.com

Have you tried bigger air correctors 180-200?
With the bigger AC jets, try the F7 E tubes.

Or F16 E tubes.

Have you tried bigger air correctors 180-200?
With the bigger AC jets, try the F7 E tubes.

Or F16 E tubes.

A member has kindly sent me the Fed Mogul manual, which describes this hole. It is an air bleed, purpose of which is to smooth the transition from the low to the high speed cct & improve part throttle economy.

I am not sure, have not seen those on Holley carbs. Add more air? The holes I am talking about are on the underside of the booster.

Tuner. Referring to the Carter AVS carbs that were used on Chrys engines from 1968 to 1971. Specifically, the primary venturiis which are secured with two screws. What I call the 'bridge': the section or arm that connects the main body to the booster ring. I have seen some where there is a hole dril...

Why would you revert from a superior design???? HD started using roller lifters in 1929. Waaaay ahead of the pack. And not just roller, but needle roller......

Are they not known for a very efficient chamber design? If so, that means less timing under all conditions.

Bullet & Comp Cams also have custom lobes, listed on their website.

There might be a fault with the Crane unit. If the XR700 maxes out at 8500 rpm with a 4 cyl, it produces the same number of sparks per minute as an 8 cyl at 4250 rpm. They run higher rpms than that with 8 cyl engines.

Don't you mean 8500 with a 4 cyl is 4250 with an 8 cyl?