351W Cam Options?

[Digger]

I need a more appropriate cam for my 351

Engine specs:

1994 351W roller truck block (E4TE) bored .030" over
ProComp aluminum heads, 210cc runners
2.05/1.60 valves - 1.6 roller rockers
9.0:1 compression

The truck came with a Trick Flow Stage 2 hydraulic roller cam
SAE duration @.006" 286/294 Duration @ .050" 224/232
Lift @ valve w/ 1.6 rockers: 542/563 Lobe seperation 112°

With the current cam, the low end torque is sad at best. The advertised power band is 2600-6200rpm. I would like something with a powerband more like 1200-5000 rpm, with peak torque 2000-2400rpm. I found this cam which seems like it would fit the bill.

CompCams 35-510-8 Grind Number:XE258HR
SAE duration @.006" 258/266 Duration @ .050" 208/216
Lift .533/.544 Lobe lift .334/.341 Lobe seperation: 112°
Power Range: 1300 to 5300

I'm curious what you guys are using. Viper?

[Viperwolf1]

That's a little smaller than what I'm using.

Part Number:35-349-8 Grind Number: XE264HR
Lifter Type: Hydraulic Roller Lifter
Engine Family: Ford 5.0L 8 cyl. 1982-2001
Description: Hydraulic Roller-Mild Street performance, Good H.O. replacement cam. Works with O.B.D.1
Cam Family: Xtreme Energy™ Hydraulic Roller Camshafts, Computer compatible (E.F.I.) with O.E. hydraulic roller cams 1985-95
RPM Range: 1500 to 5500 Valve Lash: Hyd
Valve Timing: 0.006 Duration: 264/270
Lobe Separation: 114° Duration @ .050" Lift: 212/218
Intake Centerline: 110° Valve Lift: 0.512/0.512
Lobe Lift: 0.321/0.321

Here is a desktop dyno snapshot with my engine. I have GT40 heads now but you can see the benefit of going to better heads like the AFR165s.

351w dyno.jpg

[Justin]

I'm a little surprised that there's no real difference between the heads below 3500 rpm. Equally surprised at the size of the difference above that point.

[Digger]

That is great information and exactly the feedback I was looking for! Thanks!

Those cams are similar with the Comp Cams having less duration, but more lift. That chart makes a good argument for aftermarket heads and gives me hope of making near 450 lb-ft with my heads.

[Digger]

I'm a little surprised that there's no real difference between the heads below 3500 rpm. Equally surprised at the size of the difference above that point.

Agreed, but the width of the torque curve is what I'm looking for. That chart shows an engine that make 400+ lbft over a 3000 rpm range that is useful for normal driving.

My Powerstroke was only rated for 225HP, but at nearly 500lbft of low end torque, it is a much better pulling engine than the 351 currently is.

[ZOSO]

Those heads are a little large. You want a smaller runner to keep the velocity up for better throttle response and torque. Just another thing to keep in mind. Those heads would be good on a 408/427......

[ZOSO]

google desktop dyno 2000. there is a free download that will let you plug in all your numbers and play around.

[Digger]

Those heads are a little large. You want a smaller runner to keep the velocity up for better throttle response and torque. Just another thing to keep in mind. Those heads would be good on a 408/427......

hmmm 408...

[ZOSO]

Those heads are a little large. You want a smaller runner to keep the velocity up for better throttle response and torque. Just another thing to keep in mind. Those heads would be good on a 408/427......

hmmm 408...

a new rotating assembly is only $1500.

[sykanr0ng]

A 460 will fit in an early Bronco, at least as well as a Coyote.

[Digger]

That's a little smaller than what I'm using.

Part Number:35-349-8 Grind Number: XE264HR
Lifter Type: Hydraulic Roller Lifter
Engine Family: Ford 5.0L 8 cyl. 1982-2001
Description: Hydraulic Roller-Mild Street performance, Good H.O. replacement cam. Works with O.B.D.1
Cam Family: Xtreme Energy™ Hydraulic Roller Camshafts, Computer compatible (E.F.I.) with O.E. hydraulic roller cams 1985-95
RPM Range: 1500 to 5500 Valve Lash: Hyd
Valve Timing: 0.006 Duration: 264/270
Lobe Separation: 114° Duration @ .050" Lift: 212/218
Intake Centerline: 110° Valve Lift: 0.512/0.512
Lobe Lift: 0.321/0.321

Here is a desktop dyno snapshot with my engine. I have GT40 heads now but you can see the benefit of going to better heads like the AFR165s.

351w dyno.jpg

I ended up ordering the same cam you have. Interestingly, I can't find that cam by searching Comp Cams website. It shows up if I manually enter the part number, but not on a search. Also, there is another cam with the same Grind Number, but slightly difference specs (35-320-8). It states for use with 1.7 rockers, lobe lift and duration are the same, but cam timing is shifted by 2°.

[Digger]

Thanks everyone for your input. I got to drive the truck today with the new cam and it is so butter-smooth, I LOVE IT. Still has the same seat-of-the-pants power it did before, but now it idles @600 and can pull down to ~300rpm. I'm so much more happy with this setup. The exhaust doesn't smell so "fuelly" anymore, the transmission doesn't sound like a bag of marbles at idle and even 75mph highway cruising is more quiet.