How much over stock is the intake side inlet ported?
FYI, the stock dimensions are 32mm high (1.26") and 49mm wide (1.93").

I'm looking to get an idea of how much I should be allotting for port matching on a certain IM project. I don't want to have to hear stories of people blowing though the side of an intake runner port with a high speed dremel.

 

I'm honestly surprised we haven't heard stories of someone blowing through a runner yet trying to DIY p n p their head. lol

 

m2race.com

 

Surprisingly... the head has a lot of material in it. It would take one hell of a port to blow though the head.

They don't list inlet diameter there... only valve bore sizing.

 

going for dimentions is dumb.

Speak in flow.

My inlet dimentions and runner lobe will have a different effect on your motor.

Pick a probable power rang, calculate the needed air flow, then port your head till u reach that.

You'll have much better results Vs trying to match port height and width. To many other variables.

 

wish I had some good info on this. I've only just begun to research it deeply.

 

I guess you missed the second part of my original post.

My head is already ported... but I want to know what everyone else's is at so in the future if someone buys one of my custom intake manifold and tries to port match it, that they won't **** it up. I'm looking for an idea so I can tolerance my design according.

 

Ahhh, ok

So you more or less need a flange port dimention??

 

Yup. Just need to know how much extra material to leave.

 

Not really.

There's a water jacket that is really close to the runners that wouldn't take much to blow through if you didn't know what you were doing.

 

where did you get your ported? what all did you do?

 

The valve side was done at a machine shop. The upper portion was done with a drum wheel. Each port was done to match a certain flow specification I set out ahead of time.... therefore each port might not be the same shape or szie... but they flow exactly the same amount.

 

cool, I've been talking with a guy locally. He works in the machine shop at napa. It's a small town here and he's built a TON of race engines. But he's sending my head off when I'm ready to a guy in Missouri that does ecotec heads all the time. I'm having to give him a bunch of info as well. They are building it so it flows best with a TVS since that's my future goals.

 

the exhaust side has acres of open area to work with.

 

and...

 

Bingo!

 

thats by and far what needs the most work.

its got <60% of the flow of the intake port.

 

*shakes head*
Good job reading the rest of the thread....


Considering that your car doesn't run at the moment, you could easily run out and measure it.... chop-chop on that!

 

mine is on the way from m2race.com.... i could get some calipers and give you some numbers if you like

 

Yes, but logic doesn't play well to most guys on this forum.

They'll take a dremel and grind away on both sides until it matches the picture in the DIY book they just bought.

GM has a CNC exhausted ported head that is cheap and anyone can buy if they really want a nice ported head.

 

That would be great... thanks!

.... most people don't read up on the dynamics behind supercharged flow patterns.

*sigh*

Too bad more people don't want to pay the cash to rent a flow bench for the few hours it takes to dial each port.

 

i just ordered the digital calipers from amazon. so when the head gets in i will have my wife measure the ports

 

You simply need to become friends with a guy at a machine shop with 15 years of porting experience, and access to the shops flow bench. Then you can get a fully ported, flow benched head, with full radius valve job for $250