Cam Question
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Junior User
Joined: Aug 2003
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Cam Question
I was wondering if anybody has ever ran the M-6250-A460 Ford Racing cam in there 4x4? I think is straight from there Marine engine which was 8.5:1 comp, stock heads, SCJ intake, and 600 carb rated at 300HP?
Kind of thinking of using it in the 460 when it gets "freshened up". Thanks
Kind of thinking of using it in the 460 when it gets "freshened up". Thanks
Thread Starter
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Junior User
Joined: Aug 2003
Posts: 62
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Cam Question
It is a daily driver with a C6, 3.54 gears, 285-75-16 tires with 8.5-9.0:1 compression. Marine engine only rotate backwards when there is two of them, one standard and one reverse. When there is one, it is standard
Elder User
Joined: Jan 2000
Posts: 966
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From: Crooked River Ranch, OR
Cam Question
Performance marine engines also tend to run less overlap to keep from sucking water back into the engine through the exhaust valves (assuming the boat is still exiting the exhaust under the water line). This is NOT exactly what you want for a street engine as overlap tends to help pull in additional fresh air which equates to more HP. I'd go with an RV cam over a marine cam anytime...
Deen
Deen
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From: Paola, KS
Cam Question
The Comp Cams tech line is very helpful when selecting a cam. I am using a Xtreme 4x4 cam 262H. I should be installing today sometime. It is a fairly big cam, but I have a lot of compresion.
With your setup you might like the X 4 256H, better than the 262H
With your setup you might like the X 4 256H, better than the 262H
Last edited by Brian460; Aug 27, 2003 at 08:06 AM.
Posting Guru
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From: Pryor
Cam Question
The 262 from Comp is not really a big cam for a 460. These are big engines. They can handle a lot of cam.
Brian460: Let us know how it goes. I have that cam in my 460. If you have any questions shoot me an email. I'd really be interested in hearing how it runs and what you think of it.
Bigsnag(No Email Addresses In Posts!)
JJ
Brian460: Let us know how it goes. I have that cam in my 460. If you have any questions shoot me an email. I'd really be interested in hearing how it runs and what you think of it.
Bigsnag(No Email Addresses In Posts!)
JJ
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From: Paola, KS
Cam Question
I should have worded that better. I was told by the tech line for what I do with my truck that is probaly about as much duration as I would want.
The truck in my sig has a c-6 automatic, 4.10 gears, 4" lift, 35" tires and has a flatbed on it for a total weight of 7000#, and I frequently tow 5000-7000#.
He did say that it will really wake it up compared to the Edelbrock Performer cam that was in it. 194 intake, 204 exhaust @ .050" lift and .460" intake and .480" exhaust.
I ordered my intake gaskets from Summit this morning shipped by overnight air so I should be able to start it tommorrow. I am also using the gaskets that block off the exhaust crossover.
The truck in my sig has a c-6 automatic, 4.10 gears, 4" lift, 35" tires and has a flatbed on it for a total weight of 7000#, and I frequently tow 5000-7000#.
He did say that it will really wake it up compared to the Edelbrock Performer cam that was in it. 194 intake, 204 exhaust @ .050" lift and .460" intake and .480" exhaust.
I ordered my intake gaskets from Summit this morning shipped by overnight air so I should be able to start it tommorrow. I am also using the gaskets that block off the exhaust crossover.
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Joe Kucinski
Posting Guru
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From: Paola, KS
Cam Question
I the short block consist of KB Flat top pistons, truck rods, balanced, bored .030
I am using D3VE heads so I have about 10.3:1 compression. I have a Performer intake and a Carter AFB 750 manual choke and Heddman 1 3/4" headers into 2.5" duals through Hooker 3" Max Flows and 3" dual tailpipes out the sides behind the rear tires.
This winter I plan on pulling the heads and having the exhaust side mildly ported and possably having bigger intake valves installed.
Bigsnag what do you have your timing set at with that cam?
I am using D3VE heads so I have about 10.3:1 compression. I have a Performer intake and a Carter AFB 750 manual choke and Heddman 1 3/4" headers into 2.5" duals through Hooker 3" Max Flows and 3" dual tailpipes out the sides behind the rear tires.
This winter I plan on pulling the heads and having the exhaust side mildly ported and possably having bigger intake valves installed.
Bigsnag what do you have your timing set at with that cam?
Last edited by Brian460; Aug 27, 2003 at 07:50 PM.
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From: Pryor
Cam Question
I have mine set on the two degree advanced keyway. When I actually used a degree wheel it came in at 105.5 degree intake centerline. 460's seem to like 106 degree intake centerline. Comp's spec card is based on a 107 degree intake centerline. Which would be okay, too. With my setup though I would have been at 107.5. I wanted to be closer to 106. To me that is the perfect intake centerline for 460's. In my opinion you should always use a degree wheel. It is a pain to do it, but you can't trust the cam, crank or gears to be exactly right. Most often the keyway in the crank will be off a little bit (as mine was). That should be checked and accounted for. With as much compression as you are running, you might want to retard the timing to 107-108 though. This will help decrease your low speed dynamic compression by allowing the cylinder to bleed off a little bit. This will decrease your chances of detonation. Believe me, you won't miss the low end power by retarding this cam a little, esp with that high of CR.
JJ
JJ
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Joined: May 2003
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From: Rockwood TN
Cam Question
I've got the comp cam 268h part running in mine, the techs told me to start at 12 and nurse it up to what it would take. As far as performance I have nothing to compare it to, it came withthe truck. All else is stock except accel coil, Edelbrock 600 carb, heddmn headers, thrush turbos, 2.25 inch no h pipe dual and no emissions. 1985 so compression is 8.1 i think. I'm still working on fine tuning, running high idle right now until I can fabricate an idle stop solenoid for the AC, (refuse to pay 70 bucks edelbrock for a 10 dollar part) so I don't have the lope that I expect once I turn the idle down a bit. If I had it to do over I think I would have picked a slightly smaller cam, but with dual grind.
Dart
Dart
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From: Paola, KS
Cam Question
I was refering to ignition timing, but the cam info is good to know. I have to have this thing together tommorrow, or I would order a degree wheel and use it. Right now I just used a Comp Magnum timing set, and put it straight up.
When I do the heads I will degree the cam also.
Definetly hoping to get rid of detonation that is part of the reason I am changing cams. That is the first thing Comp asked me when I told them the specs on the engine, "doesn't that have detonation problems" I said "YES" he told me the cam should entirely cure that problem.
I am also running Aluminum roller rockers I forgot to post that.
I just checked and the Performer cam I was running had a 103 degree centerline.
I wonder how 7k42s is doing? He did have the original question.
When I do the heads I will degree the cam also.
Definetly hoping to get rid of detonation that is part of the reason I am changing cams. That is the first thing Comp asked me when I told them the specs on the engine, "doesn't that have detonation problems" I said "YES" he told me the cam should entirely cure that problem.
I am also running Aluminum roller rockers I forgot to post that.
I just checked and the Performer cam I was running had a 103 degree centerline.
I wonder how 7k42s is doing? He did have the original question.
Last edited by Brian460; Aug 27, 2003 at 09:34 PM.
Laughing Gas
Joined: Aug 2003
Posts: 919
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From: Newberg Oregon
Cam Question
gentleman, new user here, so bear with me. thx.
i have a 91 f-350 was diesel now 460. 76 block cj rods federal mogul 418 coated skirt pistons. balanced. 79 truck heads with all stainless valves and I put in all adjustable valve gear and guide plates, man that was a lot of work. nice and quiet tho. this thin detonates way too much and the cam is an elgin 214, 224 @ 50. i have played with timing and carbs, edelbrock 600 is way too small for 460. 3310 holley coming. performer intake ,should i advance cam to pick up torque and possibly mileage?? help turns 2000 at 60 in 5th.thx
i have a 91 f-350 was diesel now 460. 76 block cj rods federal mogul 418 coated skirt pistons. balanced. 79 truck heads with all stainless valves and I put in all adjustable valve gear and guide plates, man that was a lot of work. nice and quiet tho. this thin detonates way too much and the cam is an elgin 214, 224 @ 50. i have played with timing and carbs, edelbrock 600 is way too small for 460. 3310 holley coming. performer intake ,should i advance cam to pick up torque and possibly mileage?? help turns 2000 at 60 in 5th.thx