Speed density
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Joined: Apr 2004
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From: Goshen, Ohio
Unfortunately Edelbrock makes cams only for the 351 truck engine and not the 302 truck engine so us 302 guys have to stick with Crane Cams or any other speed density friendly aftermarket cam out there.
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Unfortunately Edelbrock makes cams only for the 351 truck engine and not the 302 truck engine so us 302 guys have to stick with Crane Cams or any other speed density friendly aftermarket cam out there.
Why is that? A 351w camshaft will work in a 302 if its speed density, all thats required is that you use the 351w or high output 302 firing order. Seems most cam companies offer the same camshaft grind for either 351w or 302, for specific rpms ranges and needs. As a matter of fact the performer 302 and performer 351w camshaft is the same thing, different firing order, the carbed version. Later
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Joined: May 2003
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From: South of Detroit
I can change the firing order of the spark plugs but I don't know how to change the firing order of my EFI?!?!? Actually comp cams sent me the wrong cam, it was for a 351. I got're to run but (at the time) it was running real rich. I didn't know I had a bad fuel pressure regulator, thats when I found the cam to be the wrong firing order....
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What year truck do you have and is the engine original to the vehicle? If you have speed density / which is batch fire. You don't have to change the efi firing order, many people have done the 302-351w swap and left the efi firing order as it was on the 302...batch fire is much like a precise carb, except where a carb feeds the intake constantly with fuel the speed density fires 4 injectors per cycle, so it really doesn't matter what the firing order is, that and there have been many who have done something similar. If your not comfortable doing it then make comp send you a cam like the one you wanted except with the correct firing order. Some think that the 351w firing order is better, who knows? Good luck
Last edited by jwtaylor; May 16, 2004 at 07:07 PM.
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Junior User
Joined: May 2003
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From: South of Detroit
Originally Posted by jwtaylor
What year truck do you have and is the engine original to the vehicle? If you have speed density / which is batch fire. You don't have to change the efi firing order, many people have done the 302-351w swap and left the efi firing order as it was on the 302...batch fire is much like a precise carb, except where a carb feeds the intake constantly with fuel the speed density fires 4 injectors per cycle, so it really doesn't matter what the firing order is, that and there have been many who have done something similar. If your not comfortable doing it then make comp send you a cam like the one you wanted except with the correct firing order. Some think that the 351w firing order is better, who knows? Good luck
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It may very well be sefi but to my knowledge they only put sefi motors in mustangs or other cars, not trucks/vans. All well if they are replacing the cam with a 302 one then thats good.
As far as no top end, your guess is as good as mine, what is the rear axle ratio? Are you getting any codes?
As far as no top end, your guess is as good as mine, what is the rear axle ratio? Are you getting any codes?
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Joined: May 2003
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From: South of Detroit
It was a shocker to find out it was a roller motor, I coded the engine a couple of days ago. If was an old unit but my buddy said it'd work. If I read it right, one code was something about the EGR solinoid voltage too high. I got no idea what that means, so I bought an EGR valve to fix it. I haven't gotten a chance to replace it. Just after that I got a bug up my @ss and retarded the cam 4 degrees, the power band seems to be more rounded.... but I lost my bottom end grunt. I'm toying with the idea of putting it back, but I hate to tear it apart again I'm not sure of the axle gear, I want to say it's real small like a 308.
I'm not sure of the axle gear, I want to say it's real small like a 308.
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If you don't already have one get your hands on a haynes repair manual for your truck/van engine. It will show you how to check individual solenoids and sensors. I wouldn't think a bad egr solenoid would do anything other than cause poor mpg but then again anything is possible.
Well I suppose finding out you have a roller block is a good thing, unless you ordered a flat tappet cam.
Are you used to overdrive trannies, seems every engine I drove with o/d appeared to not have much in the way of power once engaged, then again I don't know what you define as sucks in overdrive.
Well good luck if you decide to tear into it and put the timing back. later
Well I suppose finding out you have a roller block is a good thing, unless you ordered a flat tappet cam.
Are you used to overdrive trannies, seems every engine I drove with o/d appeared to not have much in the way of power once engaged, then again I don't know what you define as sucks in overdrive.
Well good luck if you decide to tear into it and put the timing back. later
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Joined: May 2003
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From: South of Detroit
Originally Posted by jwtaylor
If you don't already have one get your hands on a haynes repair manual for your truck/van engine. It will show you how to check individual solenoids and sensors. I wouldn't think a bad egr solenoid would do anything other than cause poor mpg but then again anything is possible.
Well I suppose finding out you have a roller block is a good thing, unless you ordered a flat tappet cam.
Are you used to overdrive trannies, seems every engine I drove with o/d appeared to not have much in the way of power once engaged, then again I don't know what you define as sucks in overdrive.
Well good luck if you decide to tear into it and put the timing back. later
Well I suppose finding out you have a roller block is a good thing, unless you ordered a flat tappet cam.
Are you used to overdrive trannies, seems every engine I drove with o/d appeared to not have much in the way of power once engaged, then again I don't know what you define as sucks in overdrive.
Well good luck if you decide to tear into it and put the timing back. later
I have a 2003 expedition with the 4.6, what really sucks is that darn thing gets almost 19mpgs @ higher than recommended Highway speeds. If I go with the posted speed, it's 17 or less 
We use the van when we got several people going up, the TV adds something for the kids.... Keeps'em busy while I drive three hours hehehehehe