Black Snake

5.0's and 4.6's are preatty even as far as performance goes, stock I mean. The fox bodys are lil lighter then the newer 4.6 stangs.

Plus the aftermarket is huge for 5.0's, also alot cheaper to mod. So it kinda rare to race a stock 5.0, most of the time they are modded.

droptoppony

Haha you misunderstood the question

its not comparing the pushrod 5.0 to a modular 4.6...he wants to know what gains he will make by stroking a 4.6 to 5.0l or doing a big bore to a 4.6.

Nadelle

Stroking the 4.6 will gain torqe, maybe 20-30 ft-lbs. Top end power will suffer, the engine will; feell like its running out of breath sooner if all things being the same that is.

Boring the 4.6 to 5.0 is the best way to gain cubic inches, but cost alot more than stroking, as you have to take apart the engine and insert new cylinder liners. The engine with a big bore will unshroud the valves. It will make more low end torqe AND top end power

The bore to stroke ration on a stroker 5.0 is more like a truck, but big bore small strokes always biuld good low end and top end.

I asked myself this question a while ago and used Engine Analyzer Pro V3.3 to see what would happen, of course the stroker makes good torqe but dousnt liek to rev, and the big bore makes good torqe and actually want to rev higher than the stock 4.6

You should also P&P the heads and get some new cams with at least 5 more degrees of duration.

Black Snake

Ahh I under stand now, Didnt think you could bore a 289 over to a 302. My bad, But yea what they said you will gain a bunch of torque.

droptoppony

your giving us extra cubes...i like you
we actually have 281 cubic inches...pathetic huh! We should have all had the spray bore 5.0 modulars from the factory.

aking287

Why would you only stroke it to 5.0?? If I'm not mistaken a 5.4 is a stroked 4.6. Motor Trend article on the new 07 Shelby says that the 5.4 liter it has is just a stroked 4.6

97 5.0L

correct me if I am wrong but I believe to go to a 5.4 you need new heads.

droptoppony

A 5.4 is a different block then a 4.6 its physically larger....Heads are interchangable hence the term modular.

97 5.0L

I believe the 5.4 is built on the same block as the 4.6 it just has a longer stroke.

97 5.0L

I FOUND THIS ON ANOTHER FORUM



F150online Forums > Powertrain (OEM) > Engines > Difference between 5.4 and 4.6 - Engine Stroke

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kkirt109-19-1999, 10:47 PM
I was reading my owners manual (what F150 owner doesn't know it cover to cover) and noticed the specs for the 4.6 and 5.4. What jumped out at me was that the piston size is the same. The only bottom-end difference is the longer crank. Any engine bulders out there have comments on the affects of longer cranks in the seat of the pants test?

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'97 F150 Lariat, Flareside, white/sliver, SC, ORP, 5.4, Mods: 305/70/16 GY ATS, AR Baja wheels, dual exhaust, Smittybilt Nerf Bars, Edelbrock IAS Shocks, K&N Filter and Carbon Fiber Bug Gaurd. Rigged the fog lights too.

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nomo09-20-1999, 12:20 AM
Generally, a longer stroke = more torque.

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