intake swap/cam
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intake swap/cam
I have 76 f250 with 2bbl intake. I bought a performer intake and am going to swap it onto the 390. I have a couple of questions. I figure the original cam is prolly getting a little worn so am considering swapping in the eldelbrock cam to match the intake.
I dont want to pull the engine so can i get by with the old cam bearings and if i have to can i replace the cam brearings without pulling the engine or getting into the bottom end.
Another isssue that crossed my mind is will the intake port on the head match the intake runners. Can i port match the heads without pulling them. I i cant match them what issues will i see with the size difference (economy and power).
the reason i go to a 4bbl is to help economy and help uphill excelleration
highrider
I dont want to pull the engine so can i get by with the old cam bearings and if i have to can i replace the cam brearings without pulling the engine or getting into the bottom end.
Another isssue that crossed my mind is will the intake port on the head match the intake runners. Can i port match the heads without pulling them. I i cant match them what issues will i see with the size difference (economy and power).
the reason i go to a 4bbl is to help economy and help uphill excelleration
highrider
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Joined: Jun 2003
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From: Edgewood, Wa
If it is the regular Performer, you wont have any port issues with it, it will line up and work just fine. But I think that I would look at other cam profiles before you settle on the edelbrock grind. Crane makes a few great torque cams, the 901 is great in an otherwise stock motor. Some guys are running Comp cams as well, with great results. I have heard (and looking at the numbers I agree) that the Edel grind is just a bit too whimpy.
Now, if its a Performer RPM , thats a whole different story....
Rusty70F100 can enlighten you on what steps he took to make that manifold work well, as there is a port match issue. I have one in the box, and am not looking forward to pulling heads on an awesome running engine, just so I can run a manifold that I dont really need....sigh.....
Now, if its a Performer RPM , thats a whole different story....
Rusty70F100 can enlighten you on what steps he took to make that manifold work well, as there is a port match issue. I have one in the box, and am not looking forward to pulling heads on an awesome running engine, just so I can run a manifold that I dont really need....sigh.....
Last edited by CrazyAirman; Nov 21, 2004 at 12:53 PM.
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From: Iowa
Basically to get the RPM to work right on the stock heads you need to get a die grinder and stone set (cheap) and radius the intake port opening on the head to match the intake manifold. Use a gasket and match it to that. You need to pull the heads to do this, otherwise all the little metal shavings / dust will get in the cylinders and score cylinder walls. Not good.
If you dont port match 'em you'll lose a lot of flow and most of your high end power. It'll be worse than the stock intake at that point.
I'd reconsider on that edelbrock cam. It's way too mild. I recommend the Crane 343901.
You shouldn't need to replace cam bearings if you've still got good oil pressure. And even if you dont, it's probably not from the cam bearings. Just make sure you use plenty of the supplied moly lube on the cam, and follow the breakin procedure. 1500 - 2500rpm, slowly varying, for 30 minutes. Do not let it idle AT ALL for the first 30 minutes with the new cam.
If you dont port match 'em you'll lose a lot of flow and most of your high end power. It'll be worse than the stock intake at that point.
I'd reconsider on that edelbrock cam. It's way too mild. I recommend the Crane 343901.
You shouldn't need to replace cam bearings if you've still got good oil pressure. And even if you dont, it's probably not from the cam bearings. Just make sure you use plenty of the supplied moly lube on the cam, and follow the breakin procedure. 1500 - 2500rpm, slowly varying, for 30 minutes. Do not let it idle AT ALL for the first 30 minutes with the new cam.
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fuel mileage
thanks for answering my questions the crane cam sounds great but will the slightly more agressive cam hurt my fuel milage also with these miild cams cant i get by with stock valvesprings i dont plan on reving the engin much over 5 grand so valve float shouldnt be too much of an issue
Last edited by highrider76; Nov 21, 2004 at 02:05 PM. Reason: omission
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From: Edgewood, Wa
The Crane 901 runs just fine with stock springs, but it is probably the highest lift you can get away with on stock springs, that are in good condition. If this is a high mileage motor, you *may* want to consider replacing them. as far as mileage concerns, you should see a little increase, but alas, with more power comes a heavier foot, so that in it self is a limiting factor..... 
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i looked on cranes website and notices that power starts at 1500 and that the edelbrock cam starts at idle. i need as much off idle power as possible as this truck is used on the farm to pull grain wagons every fall
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