47-55.1 Eliminate draft tube options

[TX3100Guy]

Originally Posted by geezer#99

Hei is big and tall.
You gonna have room for it?

I guess I'll find out for sure tomorrow.

Here is a pic of the engine with the ill-fated magneto before it shorted out.

[dsraven]

Hei requires a 10ga power wire so run a relay driven by the regular ign coil power wire. Use a good relay and know that during normal run, not normal starting, the coil gets less than 12v due to the ballast resistor.

[TX3100Guy]

Originally Posted by dsraven

Hei requires a 10ga power wire so run a relay driven by the regular ign coil power wire. Use a good relay and know that during normal run, not normal starting, the coil gets less than 12v due to the ballast resistor.

No problem on using 10 gauge wire with a 20amp fuse inline. My plan was to connect it directly to the ignition wire off of the ignition switch (which is also 10 gauge wire). I wasn't planning on running a relay since none are showing on both the American Autowire wiring harness for a GM HEI, nor or the wiring diagram with the distributor. The same goes for the ballast resistor, none is showing for an HEI type distributor, just for a traditional distributor with an external coil.

[TX3100Guy]

No need to fret any further on how to wire and attach a GM HEI distributor. It won't fit.

It seems that the bottom of the distributor, given its width, hits the pushrod cover and won't seat fully to the cam gear and oil pump drive. I need it to seat another 1/2" further, but that is no bueno.

[geezer#99]

I see Tom has a small cap dizzy.


https://www.12bolt.com/store/p584/Di...6-235-261.html

[leegreen]

some prior art here
https://67-72chevytrucks.com/vboard/...d.php?t=586186
and
https://www.chevytalk.org/fusionbb/s...php?tid/75735/

One guy on last link describes how to DIY a 250 HEI + a SBC HEI shaft to work

Help figure this out for me, the 261 in my driveway wants a HEI

[TX3100Guy]

Originally Posted by leegreen

Help figure this out for me, the 261 in my driveway wants a HEI

So far, no joy on finding an HEI unit that 1) will fit and 2) has the correct oil pump shaft. I may forced to 1) wait for my magneto to be corrected or 2) go the traditional distributor/coil setup.