Originally Posted by C-10
What to do, what to do....
Well I have NO problem ditching the points in this dump truck. Zero sentimental value... The fact that it has no tilt nose my sway my decision. The thing is a real SOB to work on under the hood.
The distributor has this 1/4 inch line that runs to the carb, possibly vacuum or pressure for the governor'd Holley.
I tore down the carb mentioned in this thread:
Holley Carb GMC truck List 6929 info needed
It's a pretty complex little booger. It appears to have an OIL capacity on the topside of 2 of the 3 diaphragms. Strange....
If anybody has messed with these or knows how the hell it works, please post up.
Here's what I may do. I have a nice gently used Holley 3310 750 on the shelf. Also I have a spare HEI that will need a going through. I might just get a rev limiter module for the HEI and bolt on the 3310 and call it 'good'.. What do you guys think?
I've never worked on that Holley. But using a different carb sounds like a good idea to me. The governed carbs are a PITA from the get-go, and were used to keep non-owner operators from abusing them. If you just stay mindful of the redline of the engine, you don't even need a rev limiter.
If you are the worrying sort, use a tach w/a shift light or even a shift light alone to let you know when to grab a gear.
The 3310 carb will only give you what the engine demands (vacuum secondary) so being "too big" isn't a problem- even on your "industrial" TD 427.
The HEI distributor is another matter. The TD block takes a longer distributor than a 'normal' SBC or BBC engine. There are aftermarket HEI distributors that will work fine, though. Or you can add an electronic points replacement that uses the original distributor.