Another 360 question
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Joined: Sep 2007
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Another 360 question
I am in the process of rebuilding my engine again, and have a few questions. Whenever I put the engine together I was not aware of the 390 swap. The truck is a 73 f-100 with a 360. I was running a .030 over 360 with a comp cam 270 duration int/exh and .519 lift. I also had hooker full length headers. I am upgrading to a set of 390 rods and a 390 crankshaft, keeping my .030 over pistons and also adding a edelbrock performer intake and a holley 750cfm carb with vacuum secondaries. Also the heads are rebuilt stock. How much more power will I gain in doing this, and what do you think my hp would be around? Thanks
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Joined: Apr 2006
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From: Waco, Tx
First if you're going to all that trouble dont put the performer on it, use the performer rpm. The performer is pretty close to stock, just aluminum. And also I would recommend less carb. 600-650cfm is plenty for your build. I use a holley 750 on my 445.
what are the casting #'s on those heads?
will be able to give a better answer with that info.
what are the casting #'s on those heads?
will be able to give a better answer with that info.
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Joined: Jul 2002
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From: Long Island USA
Sounds like FT heads.
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From: Covina, CA
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Tuned
Joined: Mar 2009
Posts: 360
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From: Napa
The larger cam just compounds the lack of compression in the 360, the switch should really wake it up, and will match the cam much better. Gotta agree on the Performer, not much good unless you're just looking for smoothness & mileage. You could also watch craigslist for a Streetmaster or Street Dominator, usually go for around $175 for a nice one. And a Holley 1850, 600 cfm carb works very well on a mild 390 in a fairly light pickup, would be much more responsive than a 750. Make sure your timing set is a straight- up, not a smogger.
Don't worry about hp, it's just a calculated number- think torque. You're going to pick up a bunch with the switch.
Don't worry about hp, it's just a calculated number- think torque. You're going to pick up a bunch with the switch.
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I was also looking at getting a higher stall converter. I was thinking around a 2500 or 3000. I only drive the truck a few times a month, and I would like to keep the higher factory gear so I can drive seventy on the highway. If I was to go with the performer rpm, what converter would be a good choice?
Tuned
Joined: Mar 2009
Posts: 360
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From: Napa
Call the converter manu's tech line, give 'em all the info on your vehicle (and they know what to ask- and be honest about the intended usage) and they will tell you what converter you need- they're the experts
