Couple H.O Conversion questions....

[91LTDProject]

So I have everything I need for an H.O conversion, and I am just stock piling new parts now for when I do the swap (gaskets, oil pan, motor mounts, tranny mount, ect) I dont have the date set yet, but I will be pulling the engine and transmission out of the car while I am at school between March and April, and the engine will be getting cleaned up, converted, and bolted to Blazes Wide ratio AOD. Now I've read the H.O conversion sticky umpteen times, and I plan on ditching the stock fuel pump and probably replacing the gas tank while I'm at it, I'm just not sure what pump I should go with. Does a stock mustang pump work for this application? Whats the difference between the CV pump and the H.O Pump flow wise. Another thing that I'm kind of leary about is using a used cam for the conversion. The engine in my car is fairly low mileage (65-70K), and I do not know how many miles were on the cam that I bought, other than that it came out of a stock H.O that was built for a project car until the old man building it died. I dont know how much the cam bearings are going to be worn in my engine, and if a clearance issue is going to happen. Anyone had any problems with anything like this before.

[cld783]

stock piling parts is the way to go. i'd try and use the pump you have unless you think its shit already, i had no problem with mine.

[marquisman]

im gonna be in the same boat as you, hopefully in the beggining of jan ill be doing the HO conv. in my 88 wagon. i have a fully rebuilt 302 with cam, brand new gaskets and sensors and new injectors and fuel rails plus PCM. also have new highflow magnaflow cats and mufflers, and i have a 2week time span since im using the shop at work. ip pretty sure the stock pump is alright but you could go the extra mile and install a after market pump and gauge.

[91LTDProject]

I'd rather put the pump in the tank that the H.O was meant to run with. Theres people getting away with running the stock pump, I'd just rather not go that route.

And I just found a thread in the archive about fuel pumps. Says a couple mods have to be made to use the Mustang pump. Anyone have pics? or just some instructions on what you have to do?

[nitroracer]

A stock mustang pump will fit in the car just fine, there is one in my old car. I didn't drop it in, my father did it while I was at work but I didn't hear any complaints. Although I think it had to be replaced within a year. Yay for quality control.

[nitroracer]

88' Mustang GT Pump, via rock auto.



88' Crown Vic

[gadget73]

The Mustang pump is smaller diameter. Its pretty easy to modify the stock fuel sock to take the smaller pump. I did mine with a hose clamp. I punched a hole on either side of the rubber sock for the clamp to pass through, and cranked it down. Might also need a slightly longer piece of hose to go from the end of the pump to the fitting on the hanger. Its just high pressure fuel line, a foot should do the job.

Stock Mustang pump is like 80 lph, most of the replacements start around 125 lph. I think the stock pump is in the 60 lph range. Stock CV pumps are usually Bosch, I think the Mustangs are Bosch or Walbro. Summit pumps are Walbro, and they're the cheapest that I'm aware of if you want to go that route.


Windsor cam bearings usually aren't a problem. Only way to tell is to clean them up and have a look. Same with the cam. There are specs for the journals, but generally speaking, if its worn, it was likely from oil starvation and you'd see that. Clean it up real well and see what you have to work with. Rough spots on the lobes or the journals should be polished down. I've done it with jewler's sticks. Basically its a wood stick with extremely fine sandpaper on it, like 2000 grit or something.

Cam journal specs from the 85 powertrain manual for anyone who cares. Yeah these are flat tappet cams, but the bearings are all the same as far as I know, so the journals also should be the same measurements.

#1 2.0805-2.0815
#2 2.0655-2.0665
#3 2.0505-2.0515
#4 2.0355-2.0365
#5 2.0205-2.0215
runout .005 max T.I.R.
out of round .0005 max T.I.R.

Bearing inside diameter (not really possible to check the middle ones, but here you go)
#1 2.0825-2.0835
#2 2.0655-2.0665
#3 2.0525-2.0535
#4 2.0375-2.0385
#5 2.025-2.0235

You can only check the #5 bearing by knocking out the cam plug. The others, I guess you could get in there with a caliper if the crankshaft was out, but thats about the only way.