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obviously you'll need to isolate the cause , of the engine cutting off,
to a flaw or failure in the ignition or fuel delivery issues first
Id check fuel level in carb, and fuel pressure fluxuations,
as I think that's a bit more likely than ignition issues from what you describe
as it sounds a bit like the carbs either flooding or running low on fuel,
maybe due to sticking needle fuel valve or defective fuel bowl floats
but be aware ignition modules in HEI distributors , and ignition coils, do fail,
lack of the correct thermal grease under the ignition
module, WILL EVENTUALLY CAUSE IT TO FAIL
Arctic Silver 5 High-Density Polysynthetic Silver Thermal Compound AS5-12G - OEM
also fail and can act like that intermittently
be damn sure you use the correct thermal heat transfer grease,under any new ignition module you replace
Burning Out Chevy Hei Distributor Ignition Modules
bad engine grounds or ,high resistance electrical connections, like coil wires, or a defective coil, and worn ignition wires, bad, battery and engine electrical connections and faulty grounds are primary sources for this problem, the more ohms resistance, in the ignition, system's wiring...
garage.grumpysperformance.com
https://www.amazon.com/Holley-6-522-Viton-In let-Ne...
http://www.grumpysperformance.com/FuelFlowDiagram0...
or fuel pressure variation issues high/ low at times, a fuel pressure gauge on the dash ,
connected to the carb inlet port, that you can watch,
Speedway 2-5/8 Inch Fuel Pressure Gauge
Lightweight 2-5/8” Speedway gauges feature a chrome bezel, but we have included both a black and silver bezel to allow you to customize your panel. The backlight, white face makes these gauges easy to read from 0 – 15PSI. Also included with the gauge is a mounting bracket with all necessary...
and a fuel pressure regulator with return line, thats easy to adjust is likely to help
related info threads
fuel pressure regulators
Volume vs. Pressure FUEL Volume and FUEL pressure are two completely different things when you talk about fuel,supplied to an engine, but they must work together to give you the proper air/fuel mixture delivery. Both carburetors and EFI systems require the proper fuel volume to make the desired...
garage.grumpysperformance.com
IT should be rather obvious but obviously is not!
IT should be rather obvious that a great deal of the info you need to build a really efficient engine combo is easily calculated if you know just a few basics about what you want to build and the enviroment or power band its expected to operate in,but obviously is not! AND YES EVERY PART CHOICE...
garage.grumpysperformance.com
setting up your fuel system
when your setting up your cars fuel delivery system, you'll obviously need to know the physically requirements of the engine your about to feed, For your older carburetor, equiped muscle car, this will generally be for most performance cars 5-6 psi of fuel pressure at the carb inlet port, a fuel...
garage.grumpysperformance.com
carb tuning info and links
it helps a great deal to know what your working with ,ID suggest starting, by verifying TDC and having the correct timing tape on your damper then,start with 8 degrees btdc and verifying the full advance of 36 degrees total is all in at 3200rpm as a base line, once youve got that, as a standard...
garage.grumpysperformance.com
trouble shooting & rebuilding HEI ignitions
if your ignition is working correctly your getting a hot blue spark, thats got a noticeable audible snap to it if you test an ignition wire by removing it from a plug temporarily and holding it about a 1/3" from a ground like the block,a quick check of your shop manual for the correct advance...
garage.grumpysperformance.com
verifying your real advance curve
you need to start by verifying TDC on the timing tab and damper actually show TRUE TDC. IF that base line (TDC on CRANK AND TIMING TAB) is not correct, everything done after that is based on that TDC, will be wrong...
garage.grumpysperformance.com
locating vacume leaks
locating those intake manifold or other vacuum leaks is fairly easy if you have a tachometer and a propane torch yeah the way I find vacuum leaks on carb OR MPFI intake manifolds is clean and easy with no mess. get a propane torch,or you can use your oxy-acetylene welding torch if you have...
garage.grumpysperformance.com
vapor lock, fuel percolation,cause and cure
READ THRU THESE SUB LINKS http://www.estes-park-information.com/vapor-lock.html http://en.wikipedia.org/wiki/Vapour_lock viewtopic.php?f=55&t=211&hilit=inside+fuel+pump viewtopic.php?f=55&t=5365&p=16067&hilit=inside+fuel+pump#p16067...
garage.grumpysperformance.com
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