Redleg

Saw this as a new addition on the FRP site. There is an "RH" and an "LH."

Since I'm not the most automotive smart...can somebody explain what this is? Ford says the $1300 unit equals 20% more intake flow and 30% more exhaust. Not sure what that equates to in the real world.

http://www.fordracingparts.com/parts...tKeyField=9447

USMC_LB

I believe the "RH" & "LH" refer to Right Head and Left Head.

LB

creedog

Is there a link where we can more info and prices?

Redleg

Added the link...don't know why I left it off!

ov3n

Wonder how these compare to the Livernois ported heads.... The Livernois heads are less expensive since the $1795 price is both heads, and not just one, like the FRPP page seems to imply.

Redleg

Does anybody know the performance gain out of ported heads?

True_HP

I have Livernois heads on my car... Its tough to say considering I did other mods at the same time... I'd say 15-20RWHP...

mustangfan123

I would've guessed more than 15-20rwhp for Heads. Wow,I thought gains would be higher.15-20rwhp doesn't sound reasonable for a hefty $1795 price tag to me at least.

Chilliwack 42

Not really when you think about it. Its just the stock head but ported. You would get more gains if the chambers were smaller. I wonder if it would be possible to deck them.

moose_knuckle

I believe those are really meant for people who plan on putting a lot of power through the motor. Along with cams and a forged rotating assembly you will have a nice internal setup for some real power.

70MACH1OWNER

Nope. Can't deck the heads on these mod motors with their overhead cam design. It will mess up the timing chains and stuff.

SONICBOOST

that's pretty spendy for that much hp

official_style

too much $$ for not much power

LBJay

That's the world of Naturally Aspirated horsepower. The first 20-30 HP aren't too bad, price wise. After that every small horsepower gain gets progressively more and more expensive.

Knight

I think people are confused on how an engine makes power.

No matter how much flow your heads have the cylinders can only hold so much air and fuel NA. So with 4.6L of displacment the only way you are going to make alot more power NA is to increase revs or increase displacment.

Thats why most mustang people go forced induction casue you can either make power with higher revs or add displacment. and a blower or turbo is basically making your engine act like an engine of greater displacement.

RadBOSS

I think you get more cluck for your buck supercharging ...

official_style

unless you have an f-body. the fact is, these 4.6s are just toooo small! we need a bigger motor.