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Re: Rochester Monojet Question 250 6 Cylinder
rasman57 #1374220 Fri Aug 21 2020 01:58 AM
Joined: Nov 2002
Posts: 2,204
Carburetion specialist
Jerry - the ones I have seen are crimped together, not bolted. They could still be disassembled, repaired, and re-crimped, but why bother? If the manufacturer has no more integrity than putting out pumps with the wrong springs, why should we believe the rest of the pump is any better?

Good ones CAN be obtained from Then & Now.

40 years ago, I hand-built some special tooling to open the crimp on the vacuum motors used to operate the secondary carburetors on GM tri-powers, and then more special tooling to re-crimp them. While the arms were different, the diaphragms used in the vacuum motors which opened hidden headlights were the same. One could open a tri-power cannister, re-electroplate the cannister, remove the arm from the dead diaphragm, open one of the headlight cannisters, remove the arm, put the re-plated original arm on the new diaphragm, and crimp the cannister back together. I probably did 75~100 when we were restoring the tri-powers.


Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify
If you truly believe "one size fits all" try walking a mile in your spouse's shoes!
Re: Rochester Monojet Question 250 6 Cylinder
rasman57 #1374233 Fri Aug 21 2020 03:16 AM
Joined: Jan 2007
Posts: 199
Shop Shark
I was surprised by the China part of Delphi as I thought it was a GM mfg here....guess the buyer just has to sort it all out. Offshore isn't always bad...I'm told.....but I'm still willing to pay for USA quality. For the vendors..... Some tech specs even would help with pump pressure etc. Especially for the hobby guys like me. I thought " correct " replacement for a 6 cylinder 250 would take into account what the mfg. designed for use. That poor little mono jet float and needle seat combination was used to a gentle flow and suddenly it had a tsunami of pressure working on trying to start an underhood fire. Must be setup for those tons of aftermarket carbs used by many. I like the idea of giving the stock stuff some care and respect if I can. I should have paid heed to the old saying....if it ain't broke......

Rasman 1971 Chevy C10 stock 260 6 cyl 3 on the tree manual everything.
1959 Chevy 1/2-Ton []

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