602 blubbering in high gear
Ok im needing some help. Just put a brand new 602 crate in my b-mod. Fresh Willey's carb... all directly off the dyno.. When we took it to the field to test high gear it started blubbering under initial throttle in high gear... it will clear after a couple seconds.. but every time you slow back down to simulate a slow rolling start it does it on take off...Changed 4 carbs from 750 to 650 to 390 all with the same result. Changed fuel pumps, changed regulators, put new battery in, put new solenoid in, put new module in the HEI... re-wired the car where it literally only has power to the switch and then to the distributor. None of which fixing it. The car will not blubber if the RPMs stay up, but if you try a slow start and gas it, it does it. Its also turning all the spark plugs black and dry (no fuel on them)
Any thoughts or suggestions? I feel like we've changed everything but the number the last 2 days!
Also.. from the dyno the builder set the timing at 36
using NGK R5724-8 plugs gapped at 40
I know everyone's first move is to the carb.. but we've put 4 different carbs on it.. 1 of which came off a 602 that ran last weekend with no issues and all 4 had the same exact problem.. which tells me its likely not with the carb.
Also we are using piston style race pumps for fueling... has anyone used these on crates? We've ran them for years on our other engines.
Its carrying 6 lbs of fuel pressure and never falling off that (even when its blurbbing in high gear).. 60 lbs of oil pressure.. constant as well.