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Has anyone ported and polished there engine head.

I am thinking of doing it on my 2007 Elise..

For those who have done this... What did it cost you and how effective was it? Worth the money?

Thanks all
David

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I have not done it, but just as an observation, modern engines, especially high performance Japanese engines, are already machined pretty darn good. I mean, you're getting >100 HP/L already. In the early 80's, that would cost $30K and the motor would last 5K miles. Years ago, when I had the manifold off on a 4AGE 20v, I looked to port match it. You know, 'cuz that's what we always did. There was absolutely nothing to do, it was already perfectly port matched.

That said, you might try one of the 2zz specialist shops and buy a head from them. Either way, you will spend a lot of money for not much increase in HP. If you want more HP, add BOOST.

Just my opinion.
 

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I thought that stepping from a smaller port to a larger exhaust is usually not a bad thing???
Sometimes, yes, sometimes, no. The exhaust porting improvement on the 2zz
was confirmed on a dyno. The head was swapped while the car was strapped down.
Anecdotal info for sure, but I saw a nice increase in HP, Fwiw.

I never sold a ported head and promised more hp. Just offered porting to those who want the most you can get from a head.
 

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Sometimes, yes, sometimes, no. The exhaust porting improvement on the 2zz
was confirmed on a dyno. The head was swapped while the car was strapped down.
Anecdotal info for sure, but I saw a nice increase in HP, Fwiw.

I never sold a ported head and promised more hp. Just offered porting to those who want the most you can get from a head.
While I do not doubt it, the head was changed, so it could be intake side valves and port work around seats, or exhaust seats and valves, or chambers, or cams and cam timing.

But I also doubt that flow bench numbers would fully give insight.

Probably more imPORTant to have a ported head on a NA engine, as there are no pulley options that I have seen.
 
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