Carb Swap 

I put about 150 miles on the car over the last several weekends. I wan't to get 500 before turning up on the new motor. I have the rev limiter set at 4200 and have not been past 1/2 throttle. I ended up losing about 1" of vacuum with the smaller motor and a noticeably rougher idle. The engine seems to be able to take an additional 1-2 degrees of initial timing. The plugs look good and I put my wideband O2 sensor on it and it is running slightly rich. Bottom line is this is going to take a while to tune.

My 800 DP Holley has been heavily modified but I have not really gone through and cleaned it out over the last 3 years of running. I came across a Holley 6212 800 DP spreadbore on ebay for cheap and figured I could just slap that on temporarily while I messed with my big carb. This would also give me the chance to eliminate the adapter I was using and lower my shaker by almost 1".

What was supposed to be an hour job turned into a three day ordeal with a half dozen trips to the hardware store and a fair amount of re-engineering. We'll have to see if it was worth it but it looks good on the car and I am much happier with the shaker position.

Interesting for you

Only few more steps

Only few more steps

Engine
New mains, rods, cam, rings, bearings, double timming chain and gear, springs
LQ4 6.0L to LQ9 6.0L

LQ4 6.0L to LQ9 6.0L

Engine
I removed this engine out of a 2005 Yukon Denali 1500XL (Suburban). Completely rebuilt it using the LQ9 6. 0L Cadillac pistons. Comp cam with a...
Turbos

Turbos

Engine
GGot my engine painted and mounted turbos. I just wanna go fast.
Pulling it out

Pulling it out

Engine
Finally after 360, 00 miles this car is ready for a new engine. Nothing wrong with it just want to do upgrades so spent three hours pulling it.
500 Mile Break In

500 Mile Break In

Engine
Almost halfway through the break in. The fuel pump went was spraying gas into the header. Not good. Blueprint replaced new one so far so good....
New Engine

New Engine

Engine
Yanked the Tired old Motor, still had Plenty o power, but needs more. Full rebuild including new bock by Empsons Racing Engines, all new...