head flow numbers,,,

[madmatt]

Anyone care to give up flow numbers on their heads?? Say both stock and ported and at what lift and vacuum they were flowed at? Got mine back today and wondered how everyone else's stockers flowed and what they picked up.

Mine flowed as followed,,, (heads fitted with stock valves, valve job and SoCal springs) Stock heads fell off after .400 and ported gained up to .500 and fell off after that.

Stock,,
Lift INT EXT
.300 182.61 128.18
.400 186.12 135.90
.450 183.83 136.2

Ported
.300 201.37 152.47
.400 225.07 167.51
.450 229.88 170.54

 

[blk smoke lb7]

Ill have to look for my sheet but i picked up 29.4 intake and 59.8 exhaust over stock

Flow is power,im a big beliver in porting

 

[madmatt]

yeah we pull a stock turbo class so air is very limited. Anything we can do to help the air situation out is a big plus. This was the first set of duramax heads we ported and have some spare sets to keep improving with.

 

[madmatt]

all these views and no one else willing to post numbers?? dang!!!

 

[Leadfoot]

How much vacuum was this at?

I know guys who have hand ported but not flowed their heads. My buddy should be flowing a set of heads though within the next three weeks (I'll see if I can get the numbers from him).

Be carefull as I've heard guys running into MAJOR issues (cracked heads and water where it shouldn't be) as some areas of the head castings are not thick and some vary from casting to casting...FWIW.

 

[madmatt]

YA know when i posted these I noticed it didn't say on the sheet. Called but they were closed. I'll find out today.