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68GMCCustom · 03-02-2011, 04:54 PM

my radiator had a extended fitting (out about 1.5-1.75in) on my 4 core radiator on the rad cap side, just above (or below, can't remember) the top trans cooler line. I opened it up and when I shine a light into the hole I can see it on the front side of the radiator so its going straight into the main portion of the radiator and not the trans cooler. It took a 1/4" NPT fitting as I recall. Anyway...my steam vent line is now plumbed to the radiator at a point higher then the fittings exit from the motor.

and fyi....on the LS2 in our TrailBlazer SS, the steam line attaches to the radiator line as yours does...though it is to a T in a metal pipe, like an a/c hose...thats well below the steam vents exit near valley pan level.

03-02-2011, 04:54 PM	#67
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: LS swappers, post up your pics!! my radiator had a extended fitting (out about 1.5-1.75in) on my 4 core radiator on the rad cap side, just above (or below, can't remember) the top trans cooler line. I opened it up and when I shine a light into the hole I can see it on the front side of the radiator so its going straight into the main portion of the radiator and not the trans cooler. It took a 1/4" NPT fitting as I recall. Anyway...my steam vent line is now plumbed to the radiator at a point higher then the fittings exit from the motor. and fyi....on the LS2 in our TrailBlazer SS, the steam line attaches to the radiator line as yours does...though it is to a T in a metal pipe, like an a/c hose...thats well below the steam vents exit near valley pan level. __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken Last edited by 68GMCCustom; 03-02-2011 at 04:56 PM.