77 f250 302 e4od cam selection
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3rd Gear
Joined: Apr 2024
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From: New jersey
77 f250 302 e4od cam selection
Well I'll start with a little info on the truck, it's a 1977 f250. Drivetrain consists of a carburated 302, E4OD w/ 1356 transfer case and sterling 10.5 and dana 60 axles with 3.73:1 gears.
I have started to consider a cam swap while the engine is being resealed and painted.
Now that's where I'm getting a but unsure, most recommendations I have read through are based on 1:1 final drive ratios and 4:10 gears or something along those lines.
Most cams I see listed specs like lift and duration but that information means nothing to me at the moment, I understand the meaning but that's about all.
Being that I have little experience with older gasoline engine modifications and no experience selecting aftermarket camshafts. I'm hoping someone can guide me in a direction or help me educate myself to make a decent selection myself.
my goal is a little more power and of course the loping idle that we all love to hear.
The engine to my knowledge is stock and has a 600cfm holley carb with an electric choke.
Any recommendations or guidance is appreciated.
I have started to consider a cam swap while the engine is being resealed and painted.
Now that's where I'm getting a but unsure, most recommendations I have read through are based on 1:1 final drive ratios and 4:10 gears or something along those lines.
Most cams I see listed specs like lift and duration but that information means nothing to me at the moment, I understand the meaning but that's about all.
Being that I have little experience with older gasoline engine modifications and no experience selecting aftermarket camshafts. I'm hoping someone can guide me in a direction or help me educate myself to make a decent selection myself.
my goal is a little more power and of course the loping idle that we all love to hear.
The engine to my knowledge is stock and has a 600cfm holley carb with an electric choke.
Any recommendations or guidance is appreciated.
Last edited by Diascreekdiesel; Apr 13, 2024 at 06:55 PM.
More Turbo
Joined: Apr 2007
Posts: 656
Likes: 5
From: Salisbury, PA
The general rule of thumb is that increasing duration moves the torque curve further up in the RPM band, so a high duration cam has poor off idle response but better high RPM response. You also can't get a lot of lift in a small duration cam because there are physical limits on how fast you can ramp open a valve, and there just isn't enough cam lobe available on a short duration cam to get a lot of lift.
If you have stock heads, and are typically running below 3,000 rpm, something in the lower duration range will be the most suitable.
If you have stock heads, and are typically running below 3,000 rpm, something in the lower duration range will be the most suitable.
Cross-Country
Joined: Mar 2024
Posts: 67
Likes: 38
Might look into the roller cams Ford used in the last few years of the 5.0 in the explorer and mountaineer. They were supposedly more torque minded than the older 5.0 HO roller cams. Drop in retrofit roller lifters make the swap easy with no machine work required. Also, side note, how are you controlling that E4OD? You said you had a carburetor, but the E4OD is electronically controlled.
Thread Starter
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3rd Gear
Joined: Apr 2024
Posts: 3
Likes: 0
From: New jersey
Might look into the roller cams Ford used in the last few years of the 5.0 in the explorer and mountaineer. They were supposedly more torque minded than the older 5.0 HO roller cams. Drop in retrofit roller lifters make the swap easy with no machine work required. Also, side note, how are you controlling that E4OD? You said you had a carburetor, but the E4OD is electronically controlled.
The E4OD is being controlled by a Quick 4 stand alone controller in conjunction with a holley TPS kit mounted on the choke side of the carb.
The vehicle speed is read by the oem vss in the transfer case as well as speedo, that uses a mechanical speedo converter from JEGS to retain oem speedo.
Last edited by Diascreekdiesel; Apr 18, 2024 at 10:01 PM.
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