89 460 ? comp cam?
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89 460 ? comp cam?
Hello everyone, have gotten a lot of good information from you over the past few years. I was wondering if anyone has ever used the comp cams 34-255-5 cam in 460 efi. I have a 1989 f350 crewcab drw c-6 4.10 pull 10000lbs 75% of the time . 1000 above sea level rolling hills, and it does have headers w/3 inch exhuast ,2wd. cam specs are dura. 212@.050 int .490 exh.495 seperation 114 any information would be helpful. Thanks a million !!!
Cargo Master
Joined: Jul 2000
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From: Northern California
Actually that looks like a VERY good cam. the 114 seperation provides wide power band and the lift/dur looks like a strong puller.
I wonder how it compares to the stock grind, I have the same truck and looked into cams but haven't made a choice yet.
How much of a difference did the headers and exhaust make?
How do the headers fit and what did you pay for them?
I wonder how it compares to the stock grind, I have the same truck and looked into cams but haven't made a choice yet.
How much of a difference did the headers and exhaust make?
How do the headers fit and what did you pay for them?
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That is the cam they were recomending, but kinda wanted to hear from someone who had used this grind or something close. I got the headers from hedman #89460 was not impressed with the size of the flange, ended up cutting off the collectors and swelling the 3in pipe up and onto the headers and clamping. Run dual 3in back to rear axle and into a single muffler and a single outlet out right rear so that it doesn't bounce off the trailer,sounds great and was very happy with (seat of the pants) results. They were fairly easy to install except for broken studs.
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It sounds like the one I put in my 89 350. if it is Top end is about the same but it def. will help your bottom end . 2600 rpm is where it really makes the motor talk to you. With my config. 2nd in the E4OD 35 to 60 my 7000 pound crew cab will suck you into the seat. I like mine. Free up the air intake, and the exhuast and up the fuel presure. it should run great. Just don't expect a high horse power screamer. Stock computer won't let it.
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Hey doccamel, Thank you that is what I was looking for. Pull a 33 ft 5th wheel and 30 ft livestock trailer,just needing a little more in the hills , where I'm running about 2500-3000 rpms . The headers and exhuast really helped with bottom end ,but always looking for a little more.
Thanks Bigdfun
Thanks Bigdfun
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I have the same cam. but not too happy with it. the idle is very rich, it actually has black smoke out of the exhaust when you start it when it's warm. if you floor it the engine will amost die completly at about 4500 rpms. other than that it starts and runs fine. had it on the scanner at three different places, they all say the same thing system is rich. no codes other than the o2 senser out of wack. every thing has been gone through with a vantage meter, all the components are working right. I finally phoned comp cams. the tech said that anytime you cgange cams in a injected engine you have to do computer work. there was't any mention of that in the instructions. or on the advertisment. If i had known this I would never have bought it.
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That sux man. Mine didn't cause any problems. The only change I made to the injection was an adjustable fuel presure regulator, and I turned up the fuel presure a little. The answer to your problem may be an AFPR. Find one for a 5.0 mustang of about the year 89 or 90. Put a gauge on it and set the presure where it likes it.
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I've got an 89 f250 and did about the same thing you're talking about doing with the cam. I started with a full Banks header to tailpipe system then, looking for more, I went to comp to grind out a cam. I had a custom cam ground up to work with the FI, installed it and it sucked. It ran stupid rich and actually lost power, so I started looking at the fuel pressure; good, so I went to the computer. The 89's, running on speed density management, are Real hard to do anything with. Before spending the money on anything internal mods, consult your favorite chip burner/computer tuner to find out what they can accomodate with the computer, other wise you won't see much, if any gain from an aftermarket cam, and you may actually see power go down. The difference between the 89 and a few years later (90 something) ford switched to the newer style mass airflow systems which are alot more tolerant of airflow changes in the engine. I also read something about an aftermarket computer so you'd actually retain speed density, but you'd be able to tune it.
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Unfortunately no. I talked to one of the techs from superchips in order to get a custom chip burnt, where I ran into another roadblock... aparently there's two types of computers in these trucks, indentifiable by the serial number (they know, I don't) and and I gave up at that point. The chip was going to be $500+ so I swapped in the stock cam for now, and I've got a carbed 460 I'm I've almost got finished to replace it. If I can't tune it I don't want it. Superchips was the only major manufacturer that would even come close to a chip or re-programming for mine. Hopefully if that's the route you go you can find something a bit less expensive. On the other hand, my carb'ed engine is an 89 FI engine swapped to accomodate the carb. I went with d3ve heads which I ported and polished, with another extreme 4x4 grind from comp, 670 truck avenger and edelbrock performer intake. Probably a little over the top for the cam problem, but I like building engines. Oh, the efi heads wont work with a carbed intake, they're cut at a different angle.
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Thanks for the true life results. This has really made me think about changing the cam.What would happen if I would go with the stock cam and change the rocker arm ratio to a longer ratio ? Any thoughts ,or has someone already tried this ?