Griff in Fairbanks wrote:
StingrayL82 wrote:
I’m not knocking the Holley, it’s a great carb but I never understood why they used it on small block motorhomes. My ‘73 Fireball had no guts going up hill.
I was wondering that but didn't have enough info. I supposed they rejetted it but the size of venturis can't be changed.
It's probably good to assume what works on a big block won't work on a small block and vice versa.
All the parts have to work together ... and need to suit the application and use.
I've seen too many people make a big change in one area and wonder why their vehicle suddenly runs crappy instead of better. Likewise, I've seen guys build engines suitable for stock car races and are "less than impressive" while profiling around town.
I think what renders it useless on the motorhome is the combination of the weight of the motorhome and gear ratio. I don't know if you've ever been up Pacheco Pass on Hwy. 152, but that poor Fireball just did not want to go up it. I was in 2nd gear most of the way up and even had to go down to 1st at one point, and I could only go 15MPH.
The 2245 is used on AMC/Jeeps with the 304, and it does a fine job, but you're right, there's only so much you can do with jetting, the venturis can't be changed. I don't think Mopar took that into consideration, as the small block MB300 did not have the option for a 4BBL in 1975, only 2BBL.
DRTDEVL wrote:
Mine came with a ThermoQuad already, so that should help. I seem to remember my grandfather saying he got about 10 mpg, but he never drove over 45. LOL
I'm curious if yours came that way from the factory or whether your grandfather had the same idea as me and ditched the 2245. If it came that way from the factory, it shows me that Mopar realized their error in using 2BBL carbs on the MB chassis.
