Has anybody sent their head out to be port and polished? Im really wondering how much extra performance a P&P head versus a stock one gives and if its worth the extra money to send it to a machine shop to do. If the gains are minimal (* > 5-7hp), then I wont do it.

 

i did mine myself-... i also have a custom intake manifold (shorter runners) and an rside bbtb.



witht that being said, i believe i lost a few ponies (butt dyno) due to the lack of velocity. on a ported stock intake manifold you'd likely gain a bit more power.



i don't see you losing any power from it and it creates more potential if you go f/i

 

I had one done by Onpol in PR back in the day. I don't think he's around much anymore.

 

so no word on if this really gives good gains? i know its better for f/i and it dosent hurt your n/a performance the question is that if you end up spending 3-400 is it worth the money or are there better mods to do first

 

I would do it if your already removing the head for other reasons.



If that is the only reason for removing the head then I don't think it would be worth it.

 

Port/Polish: you can actually HURT power and torque by doing the wrong things in a cylinder head. You could get maybe 10% increases if you did it right. Maybe more, even - and it's 10% of everything else that adds power, too. But I agree it's probably not a great reason to pull a cylinder head by itself.

 

I agree with stocker. To be honest, just porting a head by eye or even with a flow bench is a recipe for disaster. The stock port shapes have been exhaustively engineered to provide complete burning at a variety of throttle openings and intake charge temperatures. If you have a flow bench, you might be able to increase the amount of CFM passing through the head at WOT, but it will burn like sh*t and probably run like a pig most of the time.





Just clean up any horrible casting errors, but big reshaping and refinishing is a no-no in my book.