Milling LS3 heads
Former Vendor
Joined: Jan 2007
Posts: 1,584
Likes: 17
From: Lubbock Tx
Back on this topic again thinking about pulling the trigger, except no milling just porting from a local guy. Here are the flow numbers:
Flow Numbers
Intake Exhaust
.100 80.9 60.3
.200 159.9 129.9
.300 237.1 180.1
.400 291.2 226.0
.500 330.8 255.9
.600 365.9 268.1
.700 376.6 272.1
So let the comments fly..... Hope to get some good power from 4000+ RPM's
Flow Numbers
Intake Exhaust
.100 80.9 60.3
.200 159.9 129.9
.300 237.1 180.1
.400 291.2 226.0
.500 330.8 255.9
.600 365.9 268.1
.700 376.6 272.1
So let the comments fly..... Hope to get some good power from 4000+ RPM's
If you were to only do one, it should be milling (or thinner gaskets) rather than porting. The compression will help you all around but the porting will slightly hurt down low and slightly help up top. Doing both certainly won't hurt overall performance, but if you only do one it should be bumping the compression rather than porting IMO.
Instructor
Joined: Nov 2008
Posts: 114
Likes: 1
its been proven that most of the power comes from the mill. Its worth about 20-25 rwhp on average which just goes to show the ls3 head is to big for the motor. A good port is worth about 10 rwhp. So lets do the math. Average port job 1000 bucks. for about 35rwhp. Average mill at 100 bucks for 20-25rwhp. Which one is the better bargain? However you will kill your ptv with a mill and be stuck with smallish cams.
Thread Starter
Drifting
Joined: Apr 2008
Posts: 1,356
Likes: 105
From: Mesa AZ
its been proven that most of the power comes from the mill. Its worth about 20-25 rwhp on average which just goes to show the ls3 head is to big for the motor. A good port is worth about 10 rwhp. So lets do the math. Average port job 1000 bucks. for about 35rwhp. Average mill at 100 bucks for 20-25rwhp. Which one is the better bargain? However you will kill your ptv with a mill and be stuck with smallish cams.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Thread Starter
Drifting
Joined: Apr 2008
Posts: 1,356
Likes: 105
From: Mesa AZ
Thinking about doing a head swap for Mast Black Label Med. Bore. Anybody done this swap on LS3 or similar bore/ci engine? They are saying 50-75 HP with the swap with my current setup.
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