The 250 that I have in my '66 C-10 has gotten really difficult to start when cold. I had the head complete rebuilt back in June/July and I tuned everything to spec then and rechecked it after 100 miles. Back then it started on the first try with no more than half choke. The fuel pump was replaced about 2 years ago and works perfectly.
I have a remanufactured Rochester B on it now. Here's what it takes to start it: I have to have someone cup their hand over the tube on the air cleaner, use full choke, and pump the pedal a few times while cranking. Once it catches, I have to keep the engine up to about 1000 rpm or more to keep it running with full choke once my helper takes their hand away. Once its running and will stay running, it warms up like normal. As an example of how it runs once warm, I hauled a load of firewood to a local farmer and the wood was stacked halfway up my sideboards, putting the top of the wood about 1/3 of the way up my back window.
And a few weeks before that I carri... 1" of rear suspension travel left.If I don't have an extra set of hands, it will cough and sputter and want to run on the first few cranks and maybe even run for a few seconds, and then cut off. Once it sputters or cuts off, it will crank until the battery is dead unless I get some ether and give it a sniff or two.
Once the engine is warmed up, it can sit for several hours and it will start prefect with little to no choke.
I talked to the machine shop/FLAPS (my favorite one and the employees all know me by name) that rebuilt my head and I purchased the carb from and they said that I need to check and see if anything is clogged up internally and the float level. Another one said that I need to look inside and see if there was a crack in the metal or something that would have caused it to be returned off of its original vehicle and was overlooked when it was remanufactured.
I'm looking for any suggestions on fixing my Roch. B.
Second question: what is the bore of the hole in the intake manifold that the carb mounts over and what is the on-center bolt spacing? I'm very tempted to replace my Roch. B with a Carter YF, but I don't know what it came on other than the 153 I-4 and 230's and 250's with the A.I.R. pump. Is there something better than the Carter YF that I could use instead?
