Originally Posted by russxr67
To start off with you would need a very stout 351 to run an 850. around 500 in fact would put you in the ballpark for such a carb.Someone has really messed around with this carb.Are you saying it has bigger jets in the front than the back? 91 in the front???? how big was the squirter ,46?.This would require the use of a hollow type of screw as well and would indicate the motor it was on must have had a large plenum like a tunnel ram.Does it have a reo pump on the front or is it just a conventional 30cc rig?Sure sounds weird.
I ran a brand new BG 850 dp on my last 351. It had 85 and 93 jets and i ended up using 80 pri and 88 secondries.(they all use 8 jet split). It was still too fat at idle, but ended up running slighlty lean at wide open throttle. From what i understand is the 850's large venturi's lack sufficient airspeed to pull the correct amount air/fuel mixture through the boosters. Still, it did perform quite nice. Iv'e since gone for a 750 bg with 75 and 83.
Primaries are at the front and secondries are the rear.