Do I need to get a kit specifically for the year truck I am working with or are all 1945 kits going to carry the same parts?

The Holley 1945 isn't too hard to rebuild, but it has some 'tricks' because it uses a separate top from the throttle body like the Carters. Make sure that all the mating surfaces are flat (a piece of glass and some 400 grit helps if it need to be fixed). The rebuild kits don't come with jets, but like the Holley 1920 these models use the standard jets that the 4 barrels use so you can go to a speed shop and buy one out of the guys drawer of jets, or if you order a particular size else where you will have to buy a pair...

Another item to note is the jet changed for different years and for some applications, the early versions in the 1974-1975 cars were too lean and had issues because they were equipped with a #58 jet...installing a #61 jet and resetting the linkage to the 1976 specs will improve the driveability of the vehicle...some truck models came with #62 or #63 ets, but I think the #63 would be on the rich side and cause fouling most of the time.




-D.Idiot

My truck is a 1975 D-100 and I'm running a rebuilt Holley 1945 with a 727 automatic transmission. It came with a 63 jet in it when I purchased it. I tried running smaller jets, the last one being a 61 trying to get better mileage. It did not work, the engine got slower and mileage went down because I was getting into power valve too much with smaller jet. I put the 63 back in and it runs WAY better. By the way, the factory service manual I have for 1975 calls for a 62.3 with auto trans wich is the rich side of a 62 jet.

is the jet something that always should be replaced when re-building

No, it only needs replaced if it is damaged, corroded, or you are recalibrating the main system (changing size for power or mileage).

-D.Idiot

DI is correct you dont need to replace jet unless damaged or sizing up or down to increase mileage or up for power. I ran a Holley 1bbl model 1920 for awhile and it was alot less sensitive changing jets. The 1945 model's calibration and design I think is alot more finicky when it comes to changing jet sizes from stock.

As far as the air cleaner, I would find one from a mid 1970's /6 engine. It will have the hookup for exhaust pre heater hose wich IS important to driveability with these engines. The old ones look cool, but won't run as well for you on cold mornings.

Not sure what you mean by exhaust pre-heater hose

There is a sheet metal enclosure around the exhaust manifold near the header that is called the heat stove, on the late cars this connect via a 2" round flexible metal hose to the 'snout' on the late air cleaners...via vacuum and thermostatic switch it closes a flap in the air cleaner snout so the engine gets 'warm' air from around the exhaust manifold so the engine warms up fast and has better fuel atomization when cold, once the radiator warms up the flap opens allowing the engine bay air (or on the very late cars with the outside air ducting-air from the wheel well) into the engine and things just go from there.

Holley Jets don't really wear out since all they flow is liquid gasoline...but they are subject to corrosion and if you use additives, or poor gas, or have water in the gas tank drawn into the carb (or just sitting on the shelf for 20 years without a box or silica), then they can get plugged, or have crud all over them...the worst case is, the carb is a reman and the guy who put it together goofed up the ears on the jet with his screwdriver and manly grip and the thing is just tweaked( and may not come back out...)

-D.Idiot

The valve and seat that wear out in a carb are usually the inlet valve and seat that contact the float.

Ok and I assume these will come in a new kit.