2011GTPremium

What mods do people go for when squeezing out a higher max rpm that keeps adding power? I know about the cam and headers... but what else needs to be done/fortified?

Also, random question... but how fudge is there this much overlap? That would be amazing to hear lol.

http://www.youtube.com/watch?v=KBeW3QpQrRY'

Is that possible on a streetable car?

SirKnightTG

You'll also need an intake manifold designed for high RPMs. Like the C&L or FRPP.

Upgraded valve springs would be a good idea too.

Pretty cool video BTW. That's a massive cam.


Edit: I didn't realize until now you're referring to the 5.0. I was thinking of the 4.6L above.

.boB

This is really a two part question. First, how to get more rpm's. Second, how to get morer power at those rpm's.

The average hydraulic roller drive train is good to about 6,200 or so. Valve float often begins around 5,800-6,000, dependant of springs and lifters. Keith Craft can modify a set of Ford roller lifters for more rpm's, and they seem to work well up to about 6,400when matched to the right springs.

To get m ore rpm's than that, you have to consider solid roller lifters, special springs, and light weight valve train components. You also have to build the short block to handle tha=ose rpm's.

Now, getting power up there is a more difficult proposition. You need the right cam profile, intake, exhaust, etc. There's more to it than just replacing the lifters.

Building an 8,000 rpm motor is a lot more involved than most people realize.

SirKnightTG

.boB, you're thinking about the old pushrod engines. The 3v 4.6L can handle 6500 rpms with no problem. These newer OHC engines are made to rev.

The Bullitt, which uses the exact same 4.6L as the regular GTs, has a factory redline at 6500 for example.

The new 5.0 revs to 6800 factory limit but with a different intake manifold (the one used on the Boss 302R) allows it to rev to 8200 rpm with no other engine changes. The 5.0 is a beast.

.boB

You're right. I looked at the "5.0L V8" forum heading, and naturally thought of the 5.0L Windsor engine. So, half of what I typed is pointless.