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Advancing Cam 351W Truck Engine

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Post  plowboy34 September 22nd 2016, 7:23 am

I am building a 351W for a truck, it is a 96 roller cam engine with stock short block. I am adding GT40 heads, 1.7 roller rockers and long tube headers. It is going in a 91 truck with speed density EFI and will be for towing only. No high RPM stuff, 5K will be it's max with a 4,500K more likely so my question is would you advance the cam a few degrees to pick up more low end torque, I know this worked on carb stuff but I'm not real EFI smart. Just give me your opinions good or bad.

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Post  supervel45 September 22nd 2016, 8:26 am

I would not do it. These engines are not retarded like the 70's emissions stuff and seem to run pretty good in stock trim, at least my 5.0 95 truck does.

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Post  rmcomprandy September 23rd 2016, 12:02 pm

Find a good used O.E.M. Mustang 5.0 GT hydraulic roller cam. or a new cam designed especially for a "speed density" system, even if you convert to a "Mass Air" system later.

For those heads and a slightly larger camshaft you WILL need to increase the fuel pressure by about 10%.

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Post  plowboy34 September 23rd 2016, 12:06 pm

I already have a cam from an Explorer courtesy of Whitefield....thanks again whitefield....thanks for the advice guys appreciate it

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Post  rmcomprandy September 23rd 2016, 12:22 pm

plowboy34 wrote:I already have a cam from an Explorer courtesy of Whitefield....thanks again whitefield....thanks for the advice guys appreciate it

Explorer camshaft :
F4TE-6250-BA
256/266 SAE duration - .264".280" lobe lift - 116 lobe separation; 118 intake lobe centerline

Original Mustang 5.0 HO cam:
E5ZE-6250-AA
266/266 SAE duration - .278"/.278" lobe lift - 115 lobe separation; 115 intake lobe centerline

5.0 HO cam with revised intake lobe, (less NOX emissions):
E8ZE-6250-AA
276/266 SAE duration - .278"/.278" lobe lift - 115.5 lobe separation; 116 intake lobe centerline

5.0 Cobra cam:
F3ZE-6250-CA
270/270 SAE duration - .282"/.282" lobe lift - 115 lobe separation; 121.5 intake lobe centerline.


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Post  gt350hr September 24th 2016, 3:43 am

It's "almost" a lightening engine . Like Randy said install the cam "straight up " on the gears as most of them ( like your cam) have the advance ground in.

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Post  plowboy34 September 24th 2016, 9:41 am

Great info Randy thanks, I kinda figured these EFI engines were different but wasn't positive. As I said I am pretty much EFI stupid, I know enough to be dangerous.

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Post  rmcomprandy September 24th 2016, 9:46 am

gt350hr wrote:   It's "almost" a lightening engine . Like Randy said install the cam "straight up " on the gears as most of them ( like your cam) have the advance ground in.

NONE of those camshafts I have listed are ground advanced from straight-up; most are retarded a degree or so.

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Post  rmcomprandy September 24th 2016, 9:47 am

plowboy34 wrote:Great info Randy thanks, I kinda figured these EFI engines were different but wasn't positive. As I said I am pretty much EFI stupid, I know enough to be dangerous.

That first 5.0L H.O. cam was used with a carburetor as well as F.I.

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Post  supervel45 September 24th 2016, 10:18 am

gt350hr wrote:   It's "almost" a lightening engine . Like Randy said install the cam "straight up " on the gears as most of them ( like your cam) have the advance ground in.

H'mm I thought I said half of that and did not see were Randy said it at all? Oh Well. Did those valves get lost, they never showed?

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