351w cam swap???
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Post Fiend
Joined: Jan 2001
Posts: 5,121
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From: Springfield, VA
351w cam swap???
I asked this in the general performance section and was recommended to ask the same question here, so here goes with a little background:
I have a 351w in my 95 mud truck. It is the original motor with 180k miles on it. The thing runs great, doesn't smoke, leak, or burn any oil. I already have some head work done to the stock heads (larger exhaust valves), and a free flowing air intake (K&N FIPK) and full headers/exhaust. It is a speed density motor, and short of changing to Mass Air and doing a complete rebuild, I was wondering it if was worth going to a different cam (live an RV cam) and roller rockers to get a little more umph out of the old girl.
I am gathering parts to do a complete motor swap next year, but until I can afford that build, will I just be wasting money? Also, what would be a good cam to swap in? I have been looking at the Ford Racing Z303 cam (duration@.050": 228deg/228deg, lift: .552"/.552") even though it is for the 86-95 Mustang 302's, it should fit and work in the 351w, right? Or the other option I was recommended is the comp Cams 35-349-8.
I have a 351w in my 95 mud truck. It is the original motor with 180k miles on it. The thing runs great, doesn't smoke, leak, or burn any oil. I already have some head work done to the stock heads (larger exhaust valves), and a free flowing air intake (K&N FIPK) and full headers/exhaust. It is a speed density motor, and short of changing to Mass Air and doing a complete rebuild, I was wondering it if was worth going to a different cam (live an RV cam) and roller rockers to get a little more umph out of the old girl.
I am gathering parts to do a complete motor swap next year, but until I can afford that build, will I just be wasting money? Also, what would be a good cam to swap in? I have been looking at the Ford Racing Z303 cam (duration@.050": 228deg/228deg, lift: .552"/.552") even though it is for the 86-95 Mustang 302's, it should fit and work in the 351w, right? Or the other option I was recommended is the comp Cams 35-349-8.
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Joined: Dec 2001
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From: Louisville,Ky.
That cam is way too big for speed density. I would suggest a stock 5.0 HO roller cam. It's about as big as you want to go with the SD. Even the E303 requires MAF.
Later on with MAF, I would suggest the F303. It has a nice powerband.
Later on with MAF, I would suggest the F303. It has a nice powerband.
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Post Fiend
Joined: Jan 2001
Posts: 5,121
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From: Springfield, VA
What are the specs on the stock 5.0 HO roller cam? And with this many miles on the truck am I really gaining anything with putting it in? Also, will I need new tappets, or can I get away with my stock roller tappets?
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Post Fiend
Joined: Jan 2001
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From: Springfield, VA
Wouldn't the 1.7 rockers be too much for my stock pistions (valve to piston clearance)? From what i remember the stock pistons don't have the eyebrows cut into them so by the time I shimmed the 1.7's t oclear, I'd be back at the 1.6 ratio. Or am I totally confused?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Originally Posted by kjett
What are the specs on the stock 5.0 HO roller cam?
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Post Fiend
Joined: Jan 2001
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From: Springfield, VA
Well, I guess I'll just do the rocker arms for now and wai until winter to change it all out to the bigger motor. Anyone have a recommendation on a decent set of pedistal mount roller rockers that will work? I guess I want to make sure they are adjustable to take up any slack, and then I should be able to swap them over to the new motor later on.
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Hotshot
Joined: May 2003
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From: south louisiana
You've already got an "RV" style cam in the roller 351. It's just a tad less in lift and duration than the HO cam. .020 less lift and 10 degrees less duration on the intake side. Adding 1.7's will give it .030 more lift, and cause no piston to valve clearance or lash problems. The "Z" cam is way too much and probably too much cam for pedestal rockers too, something to think about in choosing rockers and the cam for a wilder buildup.
Hotshot
Joined: May 2003
Posts: 11,141
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From: south louisiana
Specs for the 351 truck cam (F4TE roller) and the GT/HO cam: F4TE--256/266 duration (advertised not @.050) .422/.445 lift with 1.6 rockers. The GT/HO is 266/266 and .445/.445 lift. Some books list the duration at 276/266 some at 276/276 for the GT/HO grind.
Fleet Mechanic
Joined: Nov 2003
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I've done a bit of research because of my 1994 F250 5.8 project. I have a very low milage 1989 5.8 motor and am trying to take the best of both worlds but still stay way below the cost of rebuild. I found a Crane Cam CRN-444215 seems to have the best application for both of us. It is designed for computer controlled and is a significant step up from the 'factory' grind.
FTE Legend
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From: Ottawa, Ontario
Originally Posted by lisagoud
I found a Crane Cam CRN-444215 seems to have the best application for both of us. It is designed for computer controlled and is a significant step up from the 'factory' grind.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Originally Posted by lisagoud
I don't know what cam you are refeerring to but the research I have done states the Crane Cam CRN-444215 is SD friendly.
However my research indicates that anything under 114deg LSA, and/or over 220deg duration at 50 thou is definitely not SD friendly. I have also seen plenty of examples of incorrect data on cam manufacturer's and distributors web sites and in printed literature.
Fleet Mechanic
Joined: Nov 2003
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I had my machine shop GURU talk to Crane Cams directly and they stated it would be a good roller cam for either SD or MAP. I thought I could use it in my non-roller block if I transferred my spyder and links from the roller block...I did not know about the hight limitations aon the non-roller block. I'm glad I checked with you folks. Do you know about any significant changes in chamber design between the E7TE's and the post 1993 heads?