cam selection
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New User
Joined: Jul 2014
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cam selection
rebuilding my 93 F-150 4x4, auto with 5.8, hydraulic cam engine 33in tires, 3:55 gears, adding headers, good exhaust with converter, cold air intake, maybe a computer upgrade if i can find one, and this is a speed density system. seems to be alot of contriversy on cam selection, i've narrowed it down to 2 cams but if any one has a better choice feel free to suggest. the most popular grind specs are as follows
<table summary="" cellpadding="1" cellspacing="1" border="1"><tbody><tr><td>Intake / Exhaust</td> <td>204/214</td> </tr> <tr> <td>*.050 Intake / Exhaust</td> <td>.448/.472</td> </tr> <tr> <td>Lobe Sep.</td> <td>112</td> </tr> <tr> <td>Firing Order</td> <td>351W
</td></tr></tbody></table>
i would like to run the following grind if it would work with little or no additional upgrades
Cam Lift (Int./Exh.):.295/.310
Valve Lift (Int./Exh.):.474/.498
.050" Duration (Int./Exh.): 214/224
C/L Angle: 112
i'm trying to get the largest cam that will work with a basicly stock engine, .020 over bored, stock speed density f/i system, truck is a daily driver, tows about 4000 lbs of lawn equipment and trailer 3 times a week and needs to pass emissions. i know if not sure a smaller grind is safer but i'm trying to get this at it best the first time. any help appreciated.
<table summary="" cellpadding="1" cellspacing="1" border="1"><tbody><tr><td>Intake / Exhaust</td> <td>204/214</td> </tr> <tr> <td>*.050 Intake / Exhaust</td> <td>.448/.472</td> </tr> <tr> <td>Lobe Sep.</td> <td>112</td> </tr> <tr> <td>Firing Order</td> <td>351W
</td></tr></tbody></table>
i would like to run the following grind if it would work with little or no additional upgrades
Cam Lift (Int./Exh.):.295/.310
Valve Lift (Int./Exh.):.474/.498
.050" Duration (Int./Exh.): 214/224
C/L Angle: 112
i'm trying to get the largest cam that will work with a basicly stock engine, .020 over bored, stock speed density f/i system, truck is a daily driver, tows about 4000 lbs of lawn equipment and trailer 3 times a week and needs to pass emissions. i know if not sure a smaller grind is safer but i'm trying to get this at it best the first time. any help appreciated.
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my mistake, the smaller cam has a 114 lobe separation, so i guess the lobe separation being higher is more important as long as the lift and duration is kept reasonable, would one of these grinds work better
Valve Lift (Int./Exh.):.474/.498
.050" Duration (Int./Exh.): 214/224
C/L Angle: 114
or
Valve Lift (Int./Exh.):.478/.485
.050" Duration (Int./Exh.): 214/224
C/L Angle: 114
their almost the same exept the lift
Valve Lift (Int./Exh.):.474/.498
.050" Duration (Int./Exh.): 214/224
C/L Angle: 114
or
Valve Lift (Int./Exh.):.478/.485
.050" Duration (Int./Exh.): 214/224
C/L Angle: 114
their almost the same exept the lift
Laughing Gas
Joined: Aug 2002
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From: Central Wisconsin
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
The engine will run with those cams but there's not a snowballs chance in hell it'll pass emissions.. you need a cam with 114LSA(not the same as centerline) and no more than 205 intake duration.
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thanks for the info Conanski, thats what i needed to learn about, i'm old school, give my a carburetor engine with a simple distributor and no computer and i can make it sing, kinda dating myself here, finding out that computer control is a whole other animal. so would a grind like this work ok.
<table summary="" cellpadding="1" cellspacing="1" border="1"><tbody><tr><td>Intake / Exhaust *.050 </td> <td>204/214</td> </tr> <tr> <td>Intake / Exhaust</td> <td>.448/.472</td> </tr> <tr> <td>Lobe Sep.</td> <td>114</td></tr></tbody></table>
or should i reduce the duration a little more? it HAS to pass emissions unfortunately i'm in a county surrounded by counties with emission standards, the truck was passing very clean i might add with one cylinder at 60 lbs and so much blow by oil dripped from the air box, way past time for a rebuild.
<table summary="" cellpadding="1" cellspacing="1" border="1"><tbody><tr><td>Intake / Exhaust *.050 </td> <td>204/214</td> </tr> <tr> <td>Intake / Exhaust</td> <td>.448/.472</td> </tr> <tr> <td>Lobe Sep.</td> <td>114</td></tr></tbody></table>
or should i reduce the duration a little more? it HAS to pass emissions unfortunately i'm in a county surrounded by counties with emission standards, the truck was passing very clean i might add with one cylinder at 60 lbs and so much blow by oil dripped from the air box, way past time for a rebuild.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Yeah that should work, FWIW my go-to cam for this motor is the Crane 444232 with 1.7 rockers, it produces a stock like idle which is what you need for emissions but also produces strong low rpm torque.
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yea i found it, but forgot about 1.7 rockers. that will put its lift right where i'm looking for. i am finding it for around $230 for cam and lifters set does that sound about right, its twice the price of many but thats ok if it gives everything i'm looking for.
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Fleet Mechanic
Joined: Feb 2007
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From: Mooresville, NC
Unfortunately, you're in handcuffs on the cam (SD and emissions)...........your hard efforts regrettably won't yield the performance gains possible.....
..I personally put cams and headers way down on the list of things I invest in to build hp and torque.........
..I personally put cams and headers way down on the list of things I invest in to build hp and torque.........
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my current hyd flat tappet cam has these 3 numbers stamped on the end of it, 112237; 270628; 270528. any ideas of how to get the specs on this cam, these are the only numbers, stamped or cast that i can find.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Yes more intake lift and duration means it'll make more HP.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
No.. those things are mutually exclusive.
Posting Guru
Joined: Nov 2012
Posts: 1,224
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From: New Sharon, IA
Right now it has true 2.5 duals but if I put gt40 heads on I'll prolly put a set of headers on too. This is also a speed density motor