Port Matched 2g Exhaust Manifold to Felpro Gasket

[4gfun]

I just finished porting a 2g Exhaust Manifold to a Felpro Exhaust Manifold gasket.

It seems that the Felpro Exhaust Manifold gasket is larger than stock. The VFAQ warns against hogging the runners out too much and not to port it out as large as the stainless gasket. I think that the Felpro Exhaust Manifold gasket might be as large as the stainless gasket. The VFAQ warns about dead spots (not sure what that means). On a side note, I didn't port the head out at all.

I am wondering if I might have ported the EM out too far. Is there really such a thing? Anyone else port to the Felpro EM gasket?

This is what the VFAQ says "Port to match the stock 1G composite gasket, NOT the new stainless one. Porting out to the stainless one is largely a waste of time, as you can't port the runners that large, and if you port the head to match the SS gasket also, you'll have a dead spot in the airflow due to the head flaring out, then the exhman flaring back in. If you don't have the stock composite gasket, it is less than 1/8" larger than the openings in the exhman runners, so you barely need to open it up. When I port them now, I only clean up any protrusions in the entrance, and leave it at that."

Thanks

 

[nitrouskris]

What size turbo are you going to run ???

 

[4gfun]

What size turbo are you going to run ???

Ported E316g with External Wastegate and open cutout for exhuast.

 

[nitrouskris]

Just clean up the outlet and leave everything else alone

 

[4gfun]

Just clean up the outlet and leave everything else alone

I am already done porting the intake runners though. Do I throw the 2g EM away and start over now?

 

[4gfun]

From what I can see, all that increasing the runner size will do is slow spool speed but increase top end power...am I right?

 

[jayson427]

Post a picture of what you did to give everyone a better idea.

 

[nitrouskris]

I am already done porting the intake runners though. Do I throw the 2g EM away and start over now?

Its already done... May as well use it.

 

[4gfun]

I'll don't have any pics (it's already bolted back on) and will continue to use it....but still have the same question. Am I going to hurt low end but maybe gain some top end?

All I did was port the EM runners to the Felpro gasket size.

Or is this just unknown territory that I have entered into?

 

[nitrouskris]

I'll don't have any pics (it's already bolted back on) and will continue to use it....but still have the same question. Am I going to hurt low end but maybe gain some top end?

All I did was port the EM runners to the Felpro gasket size.

Or is this just unknown territory that I have entered into?

Yes
OverKill
No

I believe the The PPG did back to back testing like 15 years ago

 

[4gfun]

Yes
OverKill
No

I believe the The PPG did back to back testing like 15 years ago

Well if you are saying that I'll gain more top end at the expense of torque, then that is what I'd want anyways.

Who is PPG, I'd like to see that testing if you have any links.

Thanks!