HI!... Well my built 5.4 makes power to 6000RPM + but had to back off it on the dyno do to bad A/F's.

 

i wanna see ur dyno graph though. not saying i dont beleive ya im just curious how ur torque curve looks.

 

HI!... I'll post my dyno graphs and vids as soon as I get my final tune done. Untill then I am not posting anything. I did however make the same exact TQ as my old bolt-on 5.4 which impressed me since I dropped the compression ratio from 9.0:1 to 8.42:1 for the future turbo system. Also running cams that were custom built for me for a turbo set-up. Not N/A friendly, but they seem to work well in the current N/A mode. Since I have a 3000 stall converter when on the dyno I can only start at about 3200RPM due to the stall and the tranny downshifting back into 2ND gear under that. Max TQ is reached at about 4200RPM and starts at over 300FT/LBS at 3200RPM. At 6200RPM it drops to about 240FT/LBS. That's expected though.


Back to the manifold porting. I totally agree with that porting the stock intake manifold on basically a stock 5.4 won't do much to increase H.P, but my old 5.4 was far from stock. The FOX LAKE stage III heads alone, have a intake port about a 1/4" larger in diamter than the stock 5.4 intake manifold runner ports. My stock manifold had huge chunks of aluminum casting in just about every runner. Just clearing that out alone was worth some good CFM. Plus the center bar in the main ventury was removed to make the upper intake act more like a single plane vs. the dual plane that FORD did. It's not a 100% single plain but the best of both worlds. It was also totally gasket matched. Trust me there is a lot of material to be removed just in the gasket matching alone. As for the injector boss comment, I totally disagree. With the injector nozzle boss being trimmed back it puts the fuel stream into the airstream sooner with more coverage and therefore causing better fuel atomization. On my old 5.4 before porting the intake manifold it would strain to rev to 5600RPM in 2ND gear and not a whole lot over 5200RPM in 3RD. After it was ported and my tune was adjusted for going much leaner after the mod, it would pull to 6000RPM and 5600 with ease. 3rd would then go to about 5500RPM. It did knock a few tenths of the trucks 1/4 mile times as well. Is it worth it? For me yes because I luv doing porting and custom fabrication stuff in my garage. For the average truck owner looking for more power? Probably not, there are other mods cheaper and more rewardind to do.

 

k did the fine sanding with the flap wheel. and ported the plenum and lower manifold. all that is left now is the outlets on the intake manifold.

Plenum:

 

converted the lower to a single plane as well.. removed about 4 inches down, as deep as i could get of the divider.


and the Manifold inlets are finished up:

 

after im done with the porting just gotta media blast it to clean it all up. and also cut off the excess material on the outside of the intake to make it look nice and purdy. then im going to paint it with some high heat aluminum paint about 15 bucks per quart.

 

Lookin good! I got another project yesterday thats taking a little precedent, an old 1980 Yamaha Special 400 motorcycle.

 

lol wow sounds like a screamer!!!

 

I guess I don't quite understand something. Why would you port a stock intake-manifold when you could get an aftermarket one (like Edelbrock for example) that would give the same results? Now obviously some guys (like Neal) like doing their own work, but how much different are they?

 

HI!... No after market company makes a high performance intake manifold for a 5.4 truck engine. REICHARD RACING maked one for a 4.6 Mustang, but it's not the same. I'm in the process of building a custom sheet aluminum intake manifold for my 5.4. It witl have 6 inch tapered runners and a larger plenum for my turbo set-up I'm also building.

 

yeh im going to have to make my own as well.... once i get my heads and other goodies on. but i still got a ways to go before i turbo it.

 

Yeah, the yamaha hasn't run in 10 years. Changed the oil, revamped the carbs, tossed a little gas in it and it actually fired up. Then the carbs metering devices gave out and it flooded out. Anyway, I found a set of PI heads today for free. Ah, now the 24 hour job of replaceing them is making me think twice

 

lol yeh... headers arent an easy swap for these OHC motors

 

Okay finished all the porting now all that is left is bead blasting and then some paint.

 

i trimmed off the excess sharp edges and casting imperfections on the outside.. so that the runners are more rounded in appearance and just asthetically looks better IMO