Hello all,
first time posting on the fe forum I am usually under the 67-72 f-series. I am currently building a 360 for my truck.A 390 would have been nice but a 360 is what I had and I wanted to keep the original motor. I am trying to find underdrive pulleys for it or a serpintine kit but no luck. I have found them for 390-428 I know the only difference between the 360 and 390 are pistons, rods, and crank, does that mean that an underdrive crank pulley for a 390 wouldn't work for a 360? Hope someone can answer this, and thanks for any help. also anybody else out there build a 360, how'd it turn out?

 

In almost all cases, if an external item will work on an an FE, it works on all of the FE's except for the 428 flex plates, which are rather hidden to be called external. The pulley will work fine.

 

Thanks Bear!

 

It should work if it works on a 390. I don't think there's much benefit to an undersized pulley on an FE, There's more than enough torque there to run the accessories at any rpm. What acces. are you running anyway?

I think you'd do better to spend that money elsewhere.

 

Thanks gtex,
Let me tell you what what I've got going onto the motor. it's a 360 .30 over, edelbrock performer rpm heads, intake, carb, cam and lifters, comp cams roller rockers, holley electric fuel pump, milodon water pump and deep sump oil pan, melling high volume oil pump and an edelbrock nitrous system (just a 50-75 shot since I didn't put in forged pistons) this will be mated up to a tci c6 with a tci saturday night special torque converter. Haven't decided on what gear to run yet. Anyway I've already got a aluminum radiator and trans cooler and elec. fans I thought underdrive pulleys would free up some horsepower?? You seem like you know your stuff, any suggestions on how to get some more power without tearing her apart for a piston/crank change.

 

Bear and others know more than I do, that's for sure. But, I just don't see under-driving accessories as a big gain for an FE. On a smaller engine, sure! What accessories do you have? Power steering, AC? At the track you could probably unbelt everything but the alternator (usually on the same belt as the water pump).

A lot of guys here have toyed with the idea of building a nice 360. What cam are you running? How about pistons, are they stock comp-ratio 360 pistons?

 

i see no gain with that pulley setup. maybe on a 302 but not a 360. spend the money on something else.

 

Total agreement.
Underdrive pulleys do well on the track, but offer nothing for reality day to day road driving.
Much better off spending the money on a quality electric fan set up.

 

I had the underdrive pullys on mine. Actually didn't realize it just wanted the cool looking aluminum pully set. The truck overheated rapidly at stop lights. Switched to overdrive pully set from a 77 truck and used a fan clutch. Works way better now and can't feel any difference in performance.

 

A blower. 360's have low compression, and this one will be no different, unless you're using custom pistons. However, this leaves the door wide open for forced induction.

 

Nope, no custom pistons. stock comp ratio. and gtex the cam is an edelbrock performer rpm(duration 296/296 lift 572/572) a blower, huh? I never even thought about a blower! how much will a blower run me?

 

Lots of cash. I threw it out there as kind of a joke, but if you're serious, Freightrain Larry could probably help. It wont be cheap. I haven't priced out blowers recently.

 

There was a complete FE blower setup on ebay recently. Item 4580486547. Bidding went to $2376 with the reserve not met. I'd have to think the seller was looking for upwards of $3000.

G.

 

you can shoot an extra 25 or so horses of the gigle gas into it..... cast pistons do pretty good with 100 horse shots if it's not for a long duration....

 

When I built a 410 out of collected parts (18+ years ago) I found the pulley setup on a 410 had the crank at 7 1/8" and water pump 6 7/8" (overdrive) and the 360 opposite (underdrive). If mix and matched had to be big/small, small/big or small/small, never big/big or they will hit each other. I chose overdive as the truck has 3.54's with 32.5" tires, custom low stall converter, wanted pump and alternator at higher rpm's.
.....=o&o>.....