391HD ? carb question

[stuart olson]

Apoligies for being slightly off general subject here but I figure you guys would know about this. Freind of mie is working on fixing up a 70 ford grain truck with a siezed up 391HD. I think its a 391HD anyway. has a old Holley carb with a list number that pops nothing on thier site. Wondering if there is anything available as far as a rebuild kit is concerned or if it would be better to start over. Kinda hopeing they give up on it so I can steal the steel crank out of it.  DOHF-9510-E  LIST-4186-1 002   also has an Autolite tag DOHF E A OKB .  Any help would be appreciated.

[machoneman]

Try....

http://www.carburetion.com/CarbNumber.asp?Number=E5HE-ED

[My427stang]

You should be able to get a cheap kit from NAPA,, it's just an old Holley with a governor, I believe they are 450 cfm but they could be as high as 600, I never measured one.

My guess though is that you should be able to just use a 1850 600 vac sec needle, seat and float bowl gaskets, or for that matter, I probably would just try to fire it or just swap out needle and seat.  Most parts should be the same as the early 600 other than the governor itself

[C6AE]

I probably have one, along with the distributor, which is an integral part of it. I just "parted one out" for my service truck,a few weeks ago.

The throttle shafts in that carb are only operated by vacuum, no mechanical hook-up, it is not simple to modify them. I have used a 600 vacuum Holley as areplacement but fitted a car distributor recurved to not exceed 32° @3000 (crankshaft) with aditional vacuum advance. The distributor has to have a sleeve pressed on below the gear, or the block has to have a bushing installed to get the correct oil clearance with the block.

[BigBlueIron]

A of the shelf 600cfm vac secondary is a great replacement. For the distributor the original gov style can be converted, Faron did one for me which he had never done so he was unsure but said once he got into it it was no big deal at all. I had him install a Crane module because it had the lowest built in rev limiter of 4000. He also recurved it. Never choose an ignition module based on low rev limit before lol!

For any FT distributor work that is my recommendation, so no fooling around with a bushing and different oil pump drive. Just install, only difference is it looks a little different but has all the advantages of any other without changing or modifying other components.

Getting away from the funky vac style governor is worth some extra cash IMO.

[C6AE]

I recently had to find a cam with similar requirements, Idle at 400, max RPM 4000, max torque at 2000! That poor little engine has to take WOT at 2000 forever.  Most of the cam guys thought I was nuts, but Oregon Cams "got it" and provided me with a custom grind that is just the thing. The factory cam is a little bit wimpy, and designed to protect the engine against any sort of driver, including rental trucks driven by inner-city youth.  It was real lazy with max torque about 1600.

(There is/was a factory bushing to convert that block to an FE type dist. C4TZ-12367-A maybe? There is an aftermarket version in bronze also.)
In my collection of oddities, I have an "interesting" oil pump drive shaft from a 391 that perhaps ran an FE dist without that bushing, it was flexing enough to hit the front throw on crankshaft! That 5/16 hex is worn to 1/4" round in the center! lol

[57 lima bean]

If this is the style of carb that fails to WOT when the return spring breaks .....pitch it!!!!

[cjshaker]

If this is the style of carb that fails to WOT when the return spring breaks .....pitch it!!!!

That's the problem with people today....no sense of adventure

[GJCAT427]

Some place out in the shop I have a complete new factory carb kit. I was gonna use it on a 391 I have but that got sidelined I`ll see if I can find it and get the number. It is as complete as  a Holley kit, which it could be just repackaged as Motorcraft.

[AmerigoHauler]

If this is the style of carb that fails to WOT when the return spring breaks .....pitch it!!!!

That's the problem with people today....no sense of adventure

LOL Thanks for making my morning!!!

[TorinoBP88]

On the low cam rpm, I have my eye on an industrial engine as back up power for a seat pump... pump normal rpm is 1800. It is a really old 361 on material gas. Mechanical temperature cut out set at 200 degrees.