Good morning, I had not thought about a vacuum leak, I will be sure to check that out. the issue isn't the clutch, although I had not thought of that either. it's like I've just got past the off-idle stage and there isn't enough fuel provided to keep it running; it bucks and stutters like it's running out of gas.
The other side of the coin is with the 51 jet it was obvious the engine was running too rich, won't the increase in jet size cause the carbs to be even richer?
The engine runs smoothly at 650-700 but I'm just being careful, I'll get it down to where it needs to be after I get the rest smoothed out. watching the tachometer I'm seeing a slight swing in rpm, maybe 50 rpm or so, 700 to 750, etc. I used to have a Petronix pointless ignition (replaced the points, etc) and I got a continuous surge and return of about 6 degrees that drove me crazy so I took it out. A friend of mine likes his in a stock, single barrel 235.
I'll check full throttle in both carbs (disconnect one and try them separately?) and I feel good about the vacuum advance; it responds immediately and without hesitation.
as for the Bulldog cam I never felt like I got the street response I expected, perhaps I never got the cam properly set up. Any one interested in a Delta S-54 cam with an aluminum gear still attached to the end?
My understanding is the stock 261 cam was installed in the original Corvette 235, that it is relatively similar with a small difference in duration (longer) and as I just finished building a 261 with a Bulldog cam (yes, I'm a slow learner) I just happened to have a 261 cam with the gear all ready attached.
I agree I may have the carbs jetted too lean. I dropped the jets down from 51 to 49 and the stuttering got worse. I spoke to Patrick and he told me to go back up, to start at a 56 and go from there. I hadn't thought about it, but I've been gathering up old Rochesters for years and my collection of 56 jets is at a ration of 3 to one. the next step will be verifying no vacuum leak and a jet change to 56.
What about valve lash settings? I've all ready reset them with the engine hot.
Anyway, the saga continues, thanks guys, I'll let you know the results.
