Air/ fuel tuning
i was thinking to buy these QFT metering blocks that have all screw in ifr and pvrc and etc.
Quick Fuel Billet Carburetor Metering Blocks 34-10QFT
can anyone tell me how to tell if it fits the main body ?
its a quickfuel main body but thats all i know
i read on the quickfuel website to make sure it same setup as current carb, but then after speaking with them they said it fits all 4150.??
It looks like the IFR is in the high position on those. I think BLP has them threaded for IFR high or low. Low position is more stable.
By "make the same", QF may mean starting with all the same restrictions and bleeds as your 950 currently has.
Since your 950 was customized, the blocks and air bleeds may already be tapped.
Might as well start with what you have. Open it up, take some photos and measure the all the restrictions and bleeds.
The cheapest way to measure is to use the shank of drill bits as gages. A real gage set is a bit more money.
In standard US sizes, a set of miniature sizes bits along with standard numbered bits will do the trick.
First thing to buy is a good book - this will show where each restriction is, differences in gaskets etc, and explain the concept behind each circuit in a 4150.
If you can get a good deal on any edition of Urich & Fisher's book, or Urich's 4150 book - which is a more stripped down verion of the bigger book.
Holley, carburetors and manifolds Mike Urich Bill Fisher | eBay-Aus
David Vizard's recent Holley book goes more in depth into the circuits. He writes well and also has good illustrations. Its more info thrown at the reader in less space so a little tougher as an intro. So that's an alternative book if its more readily available. (Just don't follow any recommendations in the book blindly. The SA format doesn't allow room for full explaination of why something wsa done or worked out in a specific situation that may or may not apply. I learned this the hard way...)