Cam & compression suggestions?
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Junior User
Joined: Jun 1999
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Cam & compression suggestions?
I need to rebuild the late '60's 360 in my '65 F-350 dually. I'm looking for suggestions as to what cam to use, and what type of pistons, compression ratio, etc.
The truck weighs about 6200 empty, GVW 10000, 4-speed with granny low, 4.88 rear, 32.5 inch tires. About 3200 rpm at 60 mph. Stock 2-barrel. Want it to run on 87 octane.
I figure a fairly short cam like 214 @.050, .410 or so lift, with an 8:1 CR?
The truck weighs about 6200 empty, GVW 10000, 4-speed with granny low, 4.88 rear, 32.5 inch tires. About 3200 rpm at 60 mph. Stock 2-barrel. Want it to run on 87 octane.
I figure a fairly short cam like 214 @.050, .410 or so lift, with an 8:1 CR?
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Cam & compression suggestions?
Charles, first I make it a 390., work the heads a little, and go with a low rpm cam, since the torque rpm range is so low on the FE. Stay with the 2bll. carb. If you can make more low end power you could raise the gears, and maybe bring the rpm range to about 25 or 2600.
My 2 cents
John
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
My 2 cents
John
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
Fleet Mechanic
Joined: Nov 1999
Posts: 1,415
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From: Lower 48
Cam & compression suggestions?
I agreee with Jowilker, change the crank and pistons amd make it into a 390, you'll have more power than you know what to do with, and with that rear end we'll see in the Truck Pull Nationals. Merry Christmas
Trail Rider
Trail Rider
Fleet Mechanic
Joined: Jul 1999
Posts: 1,360
Likes: 1
From: Iowa
Cam & compression suggestions?
I'd replace the 2bbl with a 600 cfm 4bbl and something similar to an Edelbrock Performer.
For a pretty heavy truck like this that will likely pull some pretty heavy loads, I'd go for 8.5 to 8.75 to 1 compression ratio. Even under heavt loads, you shouldn't run into detonation.
I figure a fairly
>short cam like 214 @.050, .410
>or so lift, with an 8:1
>CR?
If you're going to stay with the 360, this sounds like a good cam. But you could gain an extra 30 cubes by swapping in a 390 crank, rods, and pistons. The additional cubes could soak up a bigger cam without affecting around town driveability. With a 390, I'd go with 8.75 to mabye 9.0 to 1 compression ratio, a 600 cfm 4bbl carb and intake, and something like a Comp Cam 268H High Energy cam. This cam's power band runs from 1500 to 5500 rpm. The specs are .494"lift, 268 degrees advertised duration, 218 degrees at .050" lift. This cam has a slightly noticable idle in gear, and is basically a very strong RV cam.
Also, put some headers on your motor to get away from the restrictive "logs" that ford equipped the FE's with. The motor will breathe much better.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Cam & compression suggestions?
390, I would like to know why you recommend changing to a four barrel on this app. This is a geared low dually truck.
John
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
John
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
Fleet Mechanic
Joined: Jul 1999
Posts: 1,360
Likes: 1
From: Iowa
Cam & compression suggestions?
I think either carb would work well, but the 4bbl would give some extra pulling power. How many cfm's does a 2bbl carb flow? I used to have a '73 F250 with a 4bbl 390, NP435, and 4.56's. It did darn good with the Autolite 4bbl it had. I used the carb when pulling heavy cars on a 3000 lb trailer up those southern Missouri hills.
Posting Guru
Joined: Jul 1999
Posts: 1,558
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From: Inthepast
Cam & compression suggestions?
Unless the engine is set-up from the get-go to handle the additional flow then I would say that for most light duty truck applications, the 2v is more than adequate. I think the power gains of a 4v would show up on a dyno, but will not make an appreciable difference to the seat of the pants meter except to say you will likely have a lighter wallet.
<font color="#f80732" size="4" face="Graphite Light">Stock Man
</font><font color="#0000FF" size="2" face="Graphite Light">1967 F-250 FE 390 4wd</font>
<font color="#0000FF" size="2" face="Graphite Light">1966 F-250 I6 240 2wd LWB Flare Side</font>
<a href="http://www.hometown.aol.com/tbeeee">http://www.hometown.aol.com/tbeeee</a>
<font color="#f80732" size="4" face="Graphite Light">Stock Man
</font><font color="#0000FF" size="2" face="Graphite Light">1967 F-250 FE 390 4wd</font>
<font color="#0000FF" size="2" face="Graphite Light">1966 F-250 I6 240 2wd LWB Flare Side</font>
<a href="http://www.hometown.aol.com/tbeeee">http://www.hometown.aol.com/tbeeee</a>
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Fleet Mechanic
Joined: Jul 1999
Posts: 1,360
Likes: 1
From: Iowa
Cam & compression suggestions?
Referring to post number three, as outlined in my buildup, I feel the headers, Performer intake, 268H Comp Cam, and 600 cfm carb would all work very well together on a 390. If he just wants to build a 360, then I'd forget about the 4bbl, intake, headers, and I'd reccomend the same cam he suggested. Just my opinion.
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Cam & compression suggestions?
Interesting response, I have found that the only time that I use the four barrel is when passing or showing off. I still think my tired 352 with the 2 barrel, almost performs as well as my fresh 352 with a 4. And because of showing off, it gets better gas milage.
In a truck setup like Charles has, showing off shouldn't come into play. Liten up duallys aint cool. I can't see where, unless you were passing, that you would use a 4 barrel on that truck.
My nickel
John
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
In a truck setup like Charles has, showing off shouldn't come into play. Liten up duallys aint cool. I can't see where, unless you were passing, that you would use a 4 barrel on that truck.
My nickel
John
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
Fleet Mechanic
Joined: Jul 1999
Posts: 1,360
Likes: 1
From: Iowa
Cam & compression suggestions?
I used the 4bbl when pulling a 6,000 to 9,000 lb loaded trailer up big hills in southern Missouri. All I ever got out of showing off were C&I tickets and worn out tires![img]/dcforum/Images/happy.gif[/img]
Posting Guru
Joined: Jul 1999
Posts: 1,558
Likes: 0
From: Inthepast
Cam & compression suggestions?
I agree with you on #7 Jason. If the components are all matched the end result will be worthwhile and likely net some more HP.
<font color="#f80732" size="4" face="Graphite Light">Stock Man
</font><font color="#0000FF" size="2" face="Graphite Light">1967 F-250 FE 390 4wd</font>
<font color="#0000FF" size="2" face="Graphite Light">1966 F-250 I6 240 2wd LWB Flare Side</font>
<a href="http://www.hometown.aol.com/tbeeee">http://www.hometown.aol.com/tbeeee</a>
<font color="#f80732" size="4" face="Graphite Light">Stock Man
</font><font color="#0000FF" size="2" face="Graphite Light">1967 F-250 FE 390 4wd</font>
<font color="#0000FF" size="2" face="Graphite Light">1966 F-250 I6 240 2wd LWB Flare Side</font>
<a href="http://www.hometown.aol.com/tbeeee">http://www.hometown.aol.com/tbeeee</a>
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Cam & compression suggestions?
390 all I can say is yall got some serious hills out there in Missouri. [img]/dcforum/Images/happy.gif[/img]
John
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
John
66 F100s
In the still cool hours of the night, you can hear chevys rusting away.
Thread Starter
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Junior User
Joined: Jun 1999
Posts: 60
Likes: 0
Cam & compression suggestions?
>For a pretty heavy truck like this that will likely pull some pretty heavy loads, I'd go for 8.5 to 8.75 to 1 compression ratio. Even under heavt loads, you shouldn't run into detonation.
Even on 87 octane going uphill on a hot day? Most truck replacement pistons I have seen are 7.8 to 8.2:1 range, some with iron top ring groove...
> The specs are .494"lift, 268
>degrees advertised duration, 218 degrees at
>.050" lift
I have built several Mopar big blocks but have no Ford experience before now... but in my experience a half-inch lift cam is usually not considered an RV/towing cam unless in a 500 cid engine! Also that sounds like a lot of lift for only 218@.050 - what's the rocker arm ratio?
Thanks to all for the help!
Even on 87 octane going uphill on a hot day? Most truck replacement pistons I have seen are 7.8 to 8.2:1 range, some with iron top ring groove...
> The specs are .494"lift, 268
>degrees advertised duration, 218 degrees at
>.050" lift
I have built several Mopar big blocks but have no Ford experience before now... but in my experience a half-inch lift cam is usually not considered an RV/towing cam unless in a 500 cid engine! Also that sounds like a lot of lift for only 218@.050 - what's the rocker arm ratio?
Thanks to all for the help!
Fleet Mechanic
Joined: Jul 1999
Posts: 1,360
Likes: 1
From: Iowa
Cam & compression suggestions?
> Even on 87 octane going
>uphill on a hot day? Most
>truck replacement pistons I have seen
>are 7.8 to 8.2:1 range, some
>with iron top ring groove...
My 390 is running about 8.75 to 9,0 to 1 comp ratio and I don't have any detonation problems. I have a C6 and electronic ignition.
but in my experience a
>half-inch lift cam is usually not
>considered an RV/towing cam unless in
>a 500 cid engine! Also that
>sounds like a lot of lift
>for only 218@.050
I'm no cam expert, but I think the short duration is what makes ot work so well.
- what's the
>rocker arm ratio?
I believe the ratio for hydraulic cammed FE's is 1.73, but I could be wrong.