Quick HP question!

jasonh_86

I

May 20, 2005

1,156

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Arkansas

Feb 21, 2006

#1

• Feb 21, 2006

• #1

I was just wondering what the hp difference between 2 sets of heads were, since they have slightly different CFM levels.

Head #1 - 235 cfm intake and 195 exhaust @ .500

Head #2 - 227 cfm intake and 192 cfm exhaust @ .500

Anyone know if there would be any real differences in power for an N/A 4.6L 2V? The head that flows slightly less is about $550 less and comes fully assembled along with a set of cams in them.

 

TweekedGT

New Member

Jul 22, 2004

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Alberta

Feb 21, 2006

#2

• Feb 21, 2006

• #2

Sorry man. I don't know enough about headflow. I still have my crappy PI heads. I'm guessing on an N/A car there would not be a lot of difference. If it was blown or turbo'd it could accentuate the flow a lot more.

 

jasonh_86

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May 20, 2005

1,156

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Arkansas

Feb 21, 2006

#3

• Feb 21, 2006

• #3

That's what I was figuring, but I just wasn't sure.. Hopefully one of the "headflow gurus" will chime in

 

hotmustang331

Active Member

Apr 29, 2004

2,967

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Bastrop,TX

Feb 22, 2006

#4

• Feb 22, 2006

• #4

Wish i was a guru .

But I know and almost live by this statement on my cars (cant tell on the GT lol) "the power is in the heads".

Now the difference you will see is probably in the area of 3-5 RWHP.

Basically its not worth it unless your just going all out.

The stock heads flow between 167 and 180 CFM....so going to 227 is a BIG difference.

 

jasonh_86

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May 20, 2005

1,156

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Arkansas

Feb 22, 2006

#5

• Feb 22, 2006

• #5

how much of a gain would a N/A bolt-on GT get with those heads?.. with full bolt-ons and VT Stage II cams.. any rough estimates?

 

ADRENLN

Active Member

Apr 16, 2003

2,342

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NJ

Feb 22, 2006

#6

• Feb 22, 2006

• #6

wont make much of a difference n/a. will make somwhat of a difference if you go fi.

whos heads are those that flow that much? my stage 2 fox heads only flow 223intake and 195 exhaust.

 

Mike97gt

it doe snot

Founding Member

Jan 26, 1999

10,633

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the people's republic of massachusetts

Feb 22, 2006

#7

• Feb 22, 2006

• #7

what does the heads that are 550 more come with. are they fully assembled.

remember to budget all the misc. stuff in like gaskets and hardware. also remember the tune.

the head that flows a little let might be a better deal for you.

 

helty

some Ukrainian's enjoying a handjob via my credit

Mar 30, 2005

1,461

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Baltimore, MD

Feb 22, 2006

#8

• Feb 22, 2006

• #8

I think he's comparing MMR stage 2's to MPH stage 2.5's. Of course now the answers may be tainted by the MPH nut-huggers *coughhotmustang331cough*, but nonetheless. ( im just busting his balls, im well aware of MPH's quality)

To my knowledge the MMR's come with stock valves, cams, and retainers. The MPH's I really forget how they come. Either way, Ive seen Tim himself praise MMR (over on MPH forums), and the MMR's will be used with VT stage 2's, staying N/A for my application. So I' think I'll be ordering a set of their heads towards the end of the year.

 

jasonh_86

I

May 20, 2005

1,156

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Feb 22, 2006

#9

• Feb 22, 2006

• #9

The heads that are $550 more come fully assembled except for cams

 

jasonh_86

I

May 20, 2005

1,156

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48

Arkansas

Feb 22, 2006

#10

• Feb 22, 2006

• #10

helty said:

I think he's comparing MMR stage 2's to MPH stage 2.5's. .

Click to expand...

You are correct! :SNSign: