Pulled the upper intake earlier in the snow so I could begin the porting process. Here are a couple pics of one ported and unported runner.
Pulled the upper intake earlier in the snow so I could begin the porting process. Here are a couple pics of one ported and unported runner.
Bryan
86 GLHS #161, 2016 Impala
SDAC National Member, SDAC Buckeye Chapter Member
A man has got to know his limitations.....
Looks like you can still go a bit larger,
Did your kid port that or were you drunk?
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
I wonder how much you can open up the inside radius of the upper plenum. I was thinking of making it like a funnel into the lower.
Shouldn't a before and after be of the same port? My thinking years ago was to port the top half as much as I could to effectively "shorten" the runner. (by increasing it's section width) The trick is to go gasket size (or as close as you can get) all the way into the plenum and then you can funnel the lower half, you really have no choise because you can't port it full size, even if you wanted to. (not enough material) Good start!
Robert Mclellan
http://www.youtube.com/watch?v=wambNdfnu5M
10.04 @ 143.28mph (144.82 highest mph)
Worlds fastest 8v MTX Shelby Charger
Manitoba's Fastest 4cyl!
8 valve, No Nitrous!
New clutch combo is the SH!T!
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
Shadow I'm glad my thinking on that wasn't entirely off a couple months ago when looking at a stock upper plenum. Looks like there is pleny of material towards the front to be able to do that.
Do you think maybe at one time the intake was the full size of the gasket? and they added material to choke the motor off? kinda like the intake to head gasket and the 655? Just a thought.
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
Bryan
86 GLHS #161, 2016 Impala
SDAC National Member, SDAC Buckeye Chapter Member
A man has got to know his limitations.....
Robert Mclellan
http://www.youtube.com/watch?v=wambNdfnu5M
10.04 @ 143.28mph (144.82 highest mph)
Worlds fastest 8v MTX Shelby Charger
Manitoba's Fastest 4cyl!
8 valve, No Nitrous!
New clutch combo is the SH!T!
If you open the upper too much, you will need to weld up the upper, just like the lower. It gets thin in a few places. I inherited one that was paper thin in a few areas. I think the gasket was made the way it was to account for lots of core shift. Those manifolds seem to have a lot of it.
Todd