Port and Polishing the heads?
#1
Registered User
Thread Starter
iTrader: (2)
Join Date: Feb 2007
Location: Massachusetts
Posts: 160
Likes: 0
Received 0 Likes
on
0 Posts
Port and Polishing the heads?
Has any here port and polished the heads on the HR? I know Cosworth makes heads but i do know if they make it for the HR plus $4500 is not to cheap. What kind of gains do you guys think we can gain if we port and polish our heads? Also you guys know of any reliable shop where you could send your heads to be port and polished? One of my buddies with an srt8 got his done for around $1500. I got all boltons done and was goin to do a tune but was thinking of the camshaft and heads to get more power. Any idea guys.
#2
New Member
iTrader: (13)
The cosworth heads are probly for the DE. Porting and polishing will always end up extracting power. How much versus cost is up for discussion. A tune would definetly have to be done with cams and a port/polish. There are many shops on this forum that would probly be willing to help you out. You could also take a look at local shops.
#3
Registered User
Thread Starter
iTrader: (2)
Join Date: Feb 2007
Location: Massachusetts
Posts: 160
Likes: 0
Received 0 Likes
on
0 Posts
The cosworth heads are probly for the DE. Porting and polishing will always end up extracting power. How much versus cost is up for discussion. A tune would definetly have to be done with cams and a port/polish. There are many shops on this forum that would probly be willing to help you out. You could also take a look at local shops.
Last edited by Mamounas123; 06-22-2009 at 06:18 AM.
#6
Registered User
iTrader: (1)
Join Date: Apr 2007
Location: NOLA
Posts: 1,274
Likes: 0
Received 0 Likes
on
0 Posts
i ported and polished the head on my specv (qr25), NA we saw 3-4whp, tuned we saw 6peak. After trubo we saw pretty good numbers when compared to same psi specv's without port and polish. Im not saying i was great at it, but we did gain hp before FI on a motor that is known for allowing minute gains from anything but FI. And it was MUCH MUCH cheaper than 5k... i wanna say parts/material cost about 50bucks. Time was all mine and id say i put in a good 8hrs into it.
#7
New Member
iTrader: (10)
Join Date: May 2005
Location: Jersey, New
Posts: 7,146
Likes: 0
Received 0 Likes
on
0 Posts
A port and polish by a pro would yield better results. The machines that port and polish cost a few grand alone.
I did my own little hone and polish on the upper and lower plenum pieces. I can't say it did anything, but its cheap, and a good project.
I did my own little hone and polish on the upper and lower plenum pieces. I can't say it did anything, but its cheap, and a good project.
Trending Topics
#8
Registered User
Join Date: Feb 2009
Location: Laredo, Texas
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
Forget it bro... Too Expensive not enough power and more than likely it will yeild very VERY low power gains... You would have to get a cam setup and tune specifically designed for the VQ35HR's with Ported and Polished Heads... Save your hard earned cash... Or if you are really serios about it just go turbo..! and run it on a modest conservative boost...! If your one of those guys who thinks FI is sketchy... Just save up the cash... Pay off the car... and do it right with a BMW 335i Coupe or a BMW 135i... (Buy used with low mileage) and add a Vishnu Chip.... Then see what the Pork is goin on... You would save money on insurance and you would ball WAAAY Harder...!
Just my 2.5 Cents.
Just my 2.5 Cents.
#9
Banned
iTrader: (29)
Join Date: Oct 2006
Location: Cheshire CT
Posts: 2,157
Likes: 0
Received 0 Likes
on
0 Posts
Hey, theres a NASTY machine shop down here that builds sick engines. They have the most up to date technology for cncing heads, block or anything. They can test airflow and figure out what is the most affective cut on the tubes. The name of the place is, Qarlquist competition engines. 98 Falls ave, oakville, CT 06779. 860-274-0742. Call and get a quote from them.
#10
Former Sponsor
iTrader: (564)
Join Date: Feb 2003
Location: Long Island, New York
Posts: 19,266
Likes: 0
Received 5 Likes
on
5 Posts
getting a cam to play nicely with that header is going to be your biggest limitation IMHO
the biggest gains on an NA Z are not going to come from porting the heads, it's going to come from the valve work.
this is not something you can just do yourself, it has to be done by an experienced person with the right tools, and instruments to measure before and after. Expect to pay in the $1000-$1200 range for the pair
if you're serious about having it done, let us know
the biggest gains on an NA Z are not going to come from porting the heads, it's going to come from the valve work.
this is not something you can just do yourself, it has to be done by an experienced person with the right tools, and instruments to measure before and after. Expect to pay in the $1000-$1200 range for the pair
if you're serious about having it done, let us know
Thread
Thread Starter
Forum
Replies
Last Post
ars88
Zs & Gs For Sale
18
04-04-2016 07:52 AM