Hot news about DUI Distributors

Hot news about DUI Distributors

Paul
Paul

February 20th, 2018, 12:43 am #1

Hot news from Steve Davis at Performance Distributors. Now there is a HEI style mechanical advance option with gear drive for old style (GM small block only) tachometers !!! Steve is the guy who will build us a custom curved marine distributor for a Ford 427 marine reverse rotation motor, and I am running three of these on 427 motors now, and one on a small block Chevy 327F clone. These are HEI style 50,000 volt one-wire hook-up units, and they are dead reliable. Spark plugs can be gapped nearly twice as wide as the original spec, as I am running .055” on the 427s instead of .027”, and the motors have not missed firing a cylinder in the years after these units were installed. They are far superior to the old style crab-cap style distributors, and I consider this not only a convenience but also a big safety factor, especially when I am out on the Cumberland River shipping channel at night with a boat load of guests returning from a waterfront restaurant.

If you have a 427 and contemplate installing one of these you will need to use an electric tachometer like I do, and please send me a private message and I will help you with some details. The closed cooling systems are a bit easier than the standard cooling motors, but both are really pretty easy. The 427 carb throttle plate needs to be contoured and a water fitting needs to be rotated and re-plumbed on the standard cooling motors. 427 reverse rotation distributor gears are no longer available, so you will have to send Steve your old one and he’ll just install it on the new unit. Most of the SBC motors take a standard rotation gear whether they are reverse motors or standard.

The hot news now is they will build one with a mechanical tach drive. In order to be sure one of these will fit our boats, I would suggest sending him your old distributor and he’ll send you one back that will be an exact fit and be sure the threads, etc., on the tach drive will mate up properly. Beware there are clearance considerations with some motors like closed cooled Q small blocks.

I know the boat show guys won’t want to see a modern distributor in the engine room, but I can safely testify that these are far superior to the old units and they run great, so we have the choice of originality and pain, or a modern upgrade for happiness and safety. Here are a few photos, and a link to more details. This is only one link like this so if anyone needs help send me a note and I’ll try to hook you up with something that is specific for your application.

http://www.network54.com/Forum/424840/t ... ire+thread

Regards,
Paul
Last edited by FEfinaticP on February 20th, 2018, 7:00 pm, edited 1 time in total.
Quote
Share

Paul
Paul

February 20th, 2018, 1:57 am #2











Regards,
Paul

Quote
Share

Joined: August 14th, 2007, 1:01 pm

February 22nd, 2018, 7:30 pm #3

Hot news from Steve Davis at Performance Distributors. Now there is a HEI style mechanical advance option with gear drive for old style (GM small block only) tachometers !!! Steve is the guy who will build us a custom curved marine distributor for a Ford 427 marine reverse rotation motor, and I am running three of these on 427 motors now, and one on a small block Chevy 327F clone. These are HEI style 50,000 volt one-wire hook-up units, and they are dead reliable. Spark plugs can be gapped nearly twice as wide as the original spec, as I am running .055” on the 427s instead of .027”, and the motors have not missed firing a cylinder in the years after these units were installed. They are far superior to the old style crab-cap style distributors, and I consider this not only a convenience but also a big safety factor, especially when I am out on the Cumberland River shipping channel at night with a boat load of guests returning from a waterfront restaurant.

If you have a 427 and contemplate installing one of these you will need to use an electric tachometer like I do, and please send me a private message and I will help you with some details. The closed cooling systems are a bit easier than the standard cooling motors, but both are really pretty easy. The 427 carb throttle plate needs to be contoured and a water fitting needs to be rotated and re-plumbed on the standard cooling motors. 427 reverse rotation distributor gears are no longer available, so you will have to send Steve your old one and he’ll just install it on the new unit. Most of the SBC motors take a standard rotation gear whether they are reverse motors or standard.

The hot news now is they will build one with a mechanical tach drive. In order to be sure one of these will fit our boats, I would suggest sending him your old distributor and he’ll send you one back that will be an exact fit and be sure the threads, etc., on the tach drive will mate up properly. Beware there are clearance considerations with some motors like closed cooled Q small blocks.

I know the boat show guys won’t want to see a modern distributor in the engine room, but I can safely testify that these are far superior to the old units and they run great, so we have the choice of originality and pain, or a modern upgrade for happiness and safety. Here are a few photos, and a link to more details. This is only one link like this so if anyone needs help send me a note and I’ll try to hook you up with something that is specific for your application.

http://www.network54.com/Forum/424840/t ... ire+thread

Regards,
Paul
hi paul,

i too have a pair of these for my 427's and can't say enough about what they do for the motors and reliability. mine are closed cooling and i had no alterations to make, but i don't have a commander. i also didn't have an option at the time for a mechanical tach takeoff which i needed for my synchronizer. if anyone else runs into trouble with clearances glendinning has a kit that mounts on the front of the 427.

jim
Quote
Like
Share

Joined: March 27th, 2017, 8:01 pm

February 22nd, 2018, 10:09 pm #4

Has anyone used a DUI Dist. on a raw water cooled 350q, my guess would be no. The small Mallory barely fits, but others wiser than me may have come up with a viable work around??
Quote
Like
Share

Paul
Paul

February 23rd, 2018, 1:37 am #5

That term is always confusing, not sure what “raw” means, but I think you are talking about a Closed System.

Chris-Craft used two systems : “Standard” ( water, whether you call it fresh, raw, or whatever, coming in directly from the lake or river and through the motor ) or “Closed” ( using antifreeze and heat exchangers ).

Closed systems on Q motors are tight, there is a version of the DUI that is smaller than the HEI style that uses an external coil and actually puts out more voltage and allows plugs to be gapped .060” ,..... and there is a chance those might fit the Q motors.

Steven Fernandes did some research on the HEI and determined those would not fit the Q with a Closed System ,

Regards,
Paul
Quote
Share

Paul
Paul

February 23rd, 2018, 1:42 am #6

hi paul,

i too have a pair of these for my 427's and can't say enough about what they do for the motors and reliability. mine are closed cooling and i had no alterations to make, but i don't have a commander. i also didn't have an option at the time for a mechanical tach takeoff which i needed for my synchronizer. if anyone else runs into trouble with clearances glendinning has a kit that mounts on the front of the 427.

jim
Jim Peters and Glenn Feilhauer both converted 427 Closed Systems without the need for plumbing modification, but without gear drive (not available for the 427). The Standard systems (like mind) require some re-plumbing but no big deal.

Regards,
Paul
Quote
Share

Joined: March 27th, 2017, 8:01 pm

February 23rd, 2018, 12:20 pm #7

That term is always confusing, not sure what “raw” means, but I think you are talking about a Closed System.

Chris-Craft used two systems : “Standard” ( water, whether you call it fresh, raw, or whatever, coming in directly from the lake or river and through the motor ) or “Closed” ( using antifreeze and heat exchangers ).

Closed systems on Q motors are tight, there is a version of the DUI that is smaller than the HEI style that uses an external coil and actually puts out more voltage and allows plugs to be gapped .060” ,..... and there is a chance those might fit the Q motors.

Steven Fernandes did some research on the HEI and determined those would not fit the Q with a Closed System ,

Regards,
Paul
Thanks Paul, I have standard cooling /no heat exchanger. There still isn't much clearance around the small Mallory distributor head. The Mallory seems to perform fine, and I have a spare just in case. But like previously mentioned the crab caps are the weak link. If I hear positive confirmation of a better option that fits, I'm all in, until I'll keep a close eye on my crab collection... and hope they don't bite me...and as mentioned before a wise man never leaves the dock without a spare crab









Edit comment: typo fixed
Last edited by FEfinaticP on February 23rd, 2018, 4:49 pm, edited 1 time in total.
Quote
Like
Share