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Old 04-12-2011, 09:37 PM   #11
68GMCCustom
Truck and auto performance nut
 
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Join Date: Feb 2007
Location: McKinney,Texas
Posts: 3,848
Re: Project -underfunded - '68 shortstep/carb'd LSx/200-4r build

Ordered a cooler for the trans today along with some jets, squirters, and pump cams to tune the carb (air bleeds next)... and a new electric fuel pump to provide it with better fuel pressure. I bought Summit's "Holley black" equivalant. 140psi free flow and 14psi max. pressure. I haven't had the truck down the track yet but I'm pretty sure the old pump wasn't up to the task. Doubt I'd have made it a full 1/4mi at WOT.

My ACDelco(read-Carter) fuel pump only puts out about 5.5psi at startup....except after it gets hot it drops.....and was putting out only 1.5psi the other day (according to the gauge) during a quick check while on a short drive... prompting me to cut my drive short.

Hoping to get the carb dialed in a bit better and get it to a local track this weekend.... to get a baseline on it!
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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; 04-12-2011 at 09:42 PM.
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