Cylinder Heads - too much - 347

AnthonyR23

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Sep 8, 2006

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Ontario

Jul 11, 2008

#1

• Jul 11, 2008

• #1

Hi, just wondering if stage 3 tfs tw heads are too much for the 347, and emissions tests. Or is it mainly the cam choice that affects emissions, is it possible to go to far with the cylinder head choice... for eg. I saw a set of heads for a pretty decent price... but I they will likely be choked off by my cam choice... should I just stick with the basic tfs tw heads.

 

AnthonyR23

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Sep 8, 2006

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Jul 12, 2008

#2

• Jul 12, 2008

• #2

Anyone???

 

2000xp8

SN Certified Technician

Aug 8, 2003

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NJ

Jul 12, 2008

#3

• Jul 12, 2008

• #3

I'm not sure about emissions. But for the most part i was under the impression with the right cam, almost any head can pass emissions, as long as there is no visual inspection under the hood or no info required about the parts being smog legal.

Stock TW's, will be undersized for a 347, probably come in 50rwhp short of the cars potential. (depending on the rest of the combo).

 

3

347HO

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Jan 13, 2008

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Seattle

Jul 12, 2008

#4

• Jul 12, 2008

• #4

Which TFS TWs?
Yes... for the most part, the camshaft is responsible for an engines emissions.

 

Fast63

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Sep 20, 2007

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Jul 12, 2008

#5

• Jul 12, 2008

• #5

I don't think TW heads are undersized for a 347 at all.

Yes the cam is the main determining factor when passing emissions when it comes to engine parts.

Why get a stage 3 head that flows like a garden hose if you're going to choke it with a stock or similar cam? Just get the regular heads.

 

Venom351R

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Apr 27, 2002

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Jul 13, 2008

#6

• Jul 13, 2008

• #6

AnthonyR23 said:

but I they will likely be choked off by my cam choice... should I just stick with the basic tfs tw heads.

Click to expand...

Fast63 said:

Why get a stage 3 head that flows like a garden hose if you're going to choke it with a stock or similar cam? Just get the regular heads.

Click to expand...

Unless you get a cam that is comparable to the Stage 3 TFS heads then their is no point in getting them. If your going to get that aggressive of a head your going to need a Cam and Intake that will all compliment each other. If you don't then your just leaving HP on the table and throwing money in the toilet. If you want a nice set of heads that will flow good w/ that 347 Id go w/ a set of AFR 185's a good matching cam and an Edelbrock Victor intake or TFS R

 

AnthonyR23

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Sep 8, 2006

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Jul 13, 2008

#7

• Jul 13, 2008

• #7

my pistons are twisted wedge specific... so I am sticking with twisted wedge heads.... thanks guys.. I will just go with the reg. ones...