Displacement or boost?
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.
Wes's Burb build/update/maintance
- Thread starter Wes Harden
- Start date
I heard that them-there 454’s will bolt up in those Burbs rather nicely…just say’n.
FIFY
It won't cruise at Part throttle on flat highway?
Or are you talking about running Hilly sections?
Or are you talking about running Hilly sections?
It'll cruise on flat level. Even a long easy grade will slow me down.
It pulls strong in the low gears to 3500-3600. Now I am considering a deep dive in my dist advance timing.
When matted my vacation advance can't be helping much. I get 40 deg at @2300 combined advance. Haven't checked mechanical only. Will check this soon.
Next, I might throw some plugs at it, these have been flooded a couple time recently.
It pulls strong in the low gears to 3500-3600. Now I am considering a deep dive in my dist advance timing.
When matted my vacation advance can't be helping much. I get 40 deg at @2300 combined advance. Haven't checked mechanical only. Will check this soon.
Next, I might throw some plugs at it, these have been flooded a couple time recently.
Summit 1102. Also 91 pump with Lucas octane boost or 5gl av gas. Getting expensive.
Is 9° at idle
Is 9° at idle
You couldn't feel the secondaries kick in at all?
I think they are allready open. I spend a lot of time over 1/2 throttle.
Going to remove the tbi post pump filter. Inspect all my braided hoses for internal flaps.
The new fuel filters seemed to make a small improvement. St George to lake Havasu via Las Vegas. Mostly flat but a few long gradual grades to pull. Some I was able to maintain, a few the mph crept up 1 or 2 mph.
Next oil change going to throw caution to wind and advance the cam 2° bring the power band down a few hundred rpm.
Engine did pull in 3rd gear well yesterday. 3000 to 3750 rpm, 3750 is 66 mph.
Going to remove the tbi post pump filter. Inspect all my braided hoses for internal flaps.
The new fuel filters seemed to make a small improvement. St George to lake Havasu via Las Vegas. Mostly flat but a few long gradual grades to pull. Some I was able to maintain, a few the mph crept up 1 or 2 mph.
Next oil change going to throw caution to wind and advance the cam 2° bring the power band down a few hundred rpm.
Engine did pull in 3rd gear well yesterday. 3000 to 3750 rpm, 3750 is 66 mph.
I got better mileage with my 454 than my 350 when I swapped... just saying 
Maybe I should get one these air bottles to help it breath 
I had 2 identical Suburbans same gears, same tires size,, one 5.7 and one 7.4 and my 7.4 gets 15% better mileage loaded or empty.I got better mileage with my 454 than my 350 when I swapped... just saying
I got rid of the 5.7 truck
I’m sure I get people rolling their eyes when I say the 8.1 does as good as the 5.3 used to in my truck. But when you think about peak torque coming in much earlier than any small block it doesn’t have to be spinning at 3700 rpm to maintain speed in third gear with a load on it.
The more rpm you are pulling at a given speed the more fuel you are consuming.
With my suburban, tbi 5.7 sm465 4:10 gears on 37's i got consistently 6.5 to 7 mpg on highway trips.
Swapped to a 454 and qjet and wide 38's and averaged 11 to 12 mpg pulling a trailer thru texas. My mind was blown, it just did everything easier than the old 350.
Swapped to a 454 and qjet and wide 38's and averaged 11 to 12 mpg pulling a trailer thru texas. My mind was blown, it just did everything easier than the old 350.
The cobbled together tbi probably didn't help, but she was a fat pig!
In your lighter single cab truck?
In my scaled at 6200 pound truck going over 2x 11000’ passes? Yes
