PSW Fix-it Posted June 1 Share Posted June 1 Looking for points & condenser for this distributor. It's a 1961 B Model, ENF707C w/ dual distributors What would be the equivalent in Delco Remy or other? Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/ Share on other sites More sharing options...
609albert Posted June 1 Share Posted June 1 NAPA had them for my Mack 10 years ago , tip go to the oldest counter guy. Also you may want to change over to Petronics ,no points needed ,Petronics is electronic ,have to order if you have positive ground battery connections Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576782 Share on other sites More sharing options...
PSW Fix-it Posted June 1 Author Share Posted June 1 My Napa ProLink doesn't have any listings for Mack gas engines, will have to call & see if they can find them. Someone mentioned it may be the same distributor as an old Chevy 6 cylinder from that era Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576783 Share on other sites More sharing options...
BTFD 3227 Posted June 1 Share Posted June 1 (edited) Are you just needing the points and condenser numbers or the electric ignition parts? I just swapped the ignitions over in our 707b. I’m guessing they’d be the same. I’ve got new points and condensers that came with the truck but swapped anyway. Edited June 1 by BTFD 3227 Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576788 Share on other sites More sharing options...
PSW Fix-it Posted June 1 Author Share Posted June 1 Points & condenser numbers only. This has dual distributors, so converting would be expensive Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576796 Share on other sites More sharing options...
BTFD 3227 Posted June 2 Share Posted June 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576806 Share on other sites More sharing options...
BTFD 3227 Posted June 2 Share Posted June 2 Doing both of my distributors was a bit but not having to deal with points ever again made it worth it to me. Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576807 Share on other sites More sharing options...
PSW Fix-it Posted June 2 Author Share Posted June 2 Thanks, that should e what I needed. I'm sure doing both requires a little patience, we shall overcome! Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576832 Share on other sites More sharing options...
Jack Mack Posted June 2 Share Posted June 2 We just did both points and condensers on ours but are planning on doing one electronic and just select that ignition. I assume you have a fire truck, with (L-R-Both) ignition switch. Life will be simpler electronic …Jack Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576837 Share on other sites More sharing options...
Geoff Weeks Posted June 2 Share Posted June 2 I am not a fan of "all under the cap" electronic ign. May be it was 'early days" but many had trouble with them failing. I am working on fitting a Chry reluctor to a Delco dist. If I ever get the project done (I'll post here, but don't hold your breath) then any remote control ign box could be used. For a "hobby/show"vehicle that doesn't see many hrs on the engine, points will last a long, long time. Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576838 Share on other sites More sharing options...
PSW Fix-it Posted June 2 Author Share Posted June 2 Something to be said for mechanical parts, durability & repairability for sure. If the electronics crap out, call a wrecker to get home. We'll be watching Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576839 Share on other sites More sharing options...
Geoff Weeks Posted June 2 Share Posted June 2 36 minutes ago, Jack Mack said: We just did both points and condensers on ours but are planning on doing one electronic and just select that ignition. I assume you have a fire truck, with (L-R-Both) ignition switch. Life will be simpler electronic …Jack I don't know how they do it on your engine, but a lot of duel ign engines are designed to be run on both, all the time. They will run on one, but with reduced power. They are "starting the fire" at opposite sides of the cyl, and when you only burn from one side, power is lost and economy goes to hell. I have a duel ign Buda. Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576840 Share on other sites More sharing options...
Jack Mack Posted June 2 Share Posted June 2 Ours we were told is a redundant system as is the electric fuel pump and mechanical fuel pump that were on build sheet , mechanical Pump was not there but piping from tank was when we got the truck. Our ignition switch gives you the choice we have ran it on each separately and with both on and did not see a big difference but this was not on the highway trying to get to our 2600 rpm. ….Jack Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576844 Share on other sites More sharing options...
Jack Mack Posted June 2 Share Posted June 2 I think we will have to play with the one or two distributors once we can get out on highway and see. Geoff your point seems valid to me, our engine is rated to 2700 RPM but Boston requested on build sheet to set it to 2100 RPM, perhaps getting to that max horsepower needs both….Jack Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576845 Share on other sites More sharing options...
BTFD 3227 Posted June 2 Share Posted June 2 Yes, the dual system is for efficiency as well as a safety backup system. If one system fails while pumping a fire, the other system keeps things going. Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-576847 Share on other sites More sharing options...
T-Mack1 Posted 23 hours ago Share Posted 23 hours ago There's a company in Virginia , Brillman Company, that sells the parts online. http://www.brillman.com We got two rotors, two points and two condensers for our ENF707C for around $46, including shipping. Their business is selling electrical parts & wire for antique tractors and antique trucks. Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-577462 Share on other sites More sharing options...
T-Mack1 Posted 23 hours ago Share Posted 23 hours ago On 6/2/2025 at 11:28 AM, Geoff Weeks said: I don't know how they do it on your engine, but a lot of duel ign engines are designed to be run on both, all the time. They will run on one, but with reduced power. They are "starting the fire" at opposite sides of the cyl, and when you only burn from one side, power is lost and economy goes to hell. I have a duel ign Buda. We haven't traced all the wiring yet. But, it seems that the choice is IGN "L" at regular voltage or "R" at regular voltage, or both. When I was installing the points, I noticed that the two distributors are ever so slightly timed differently. I do need to re-gap the points because at the time I only had the 707B tune-up info and the 707C are a tiny bit different. It does run better on both, but that could be having the two different firing times. Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-577463 Share on other sites More sharing options...
PSW Fix-it Posted 22 hours ago Author Share Posted 22 hours ago Thanks, did locate Brillman also Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-577464 Share on other sites More sharing options...
Geoff Weeks Posted 20 hours ago Share Posted 20 hours ago The switch allows you to quickly test that both are working, You should see an RPM drop when firing on only one, often around 50 rpm. Start on both, flip to one, then the other, to check and then back to both. Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-577467 Share on other sites More sharing options...
BTFD 3227 Posted 12 hours ago Share Posted 12 hours ago I have noticed that even with the electronic ignitions my 707B runs better on both. A runs pretty smooth. B runs rough and back fires. Probably a timing issue. I’ll get to that as soon as I get the brakes sorted and ready for actual road testing. Quote Link to comment https://www.bigmacktrucks.com/topic/75600-cross-for-mack-423gb3103-distributor/#findComment-577499 Share on other sites More sharing options...
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