Good afternoon! I have a 70 mach 1 H code with a 2bbl 351C. I have been having a real hard time Trying to get the car tuned, so I replaced the Autolite 2150 with a Holley avenger 500CFM. I am not looking to change the Manifold or go to a 4bbl ( this is a car my 17 y/o and I acquired and we are finishing together and will be his summer daily driver..BTW this car was sitting in a barn since 85') I recently did a compression test and found 1-4 at 110 or so, and then 5-8 around 110-125. to increase the compression I ran a bottle of Restore through the engine and the compression numbers jumped to 125-140. (same test and not wide open throttle on either test). Now I am getting a "firecracker" noise in the carb/manifold. it is not popping out of the carb like a back fire, but more in the manifold. I remove plug wire for the last cylinder at the firewall on the passenger side and the "firecracker" noise goes away, and when re connect the wire, it comes back immediately. I am left with the belief that there is an issue with the lifter rod or lifter for that cylinder. Also a quick note, there is NO play at at all in any lifter on the passenger side, and haven't checked driver side as the noise goes away only when I remove that plug wire. I have New plugs, wires, Cap, rotor, and running a electronic ignition and new coil. until I ran the restore the car never made that noise, but I was told that the lifter has an issue due to the increased compression (110-125) specifically on that cylinder, and the restores components. I am going to replace all Lifters, rocker arms, push rods, pivots, studs, timing chain and water pump (because I have it off and might as well) , so my question is , does this make sense? The engine idles beautifully (except that noise) and if this does make sense, does anyone have any recommendations for a hydraulic lifter/cam set for 2 bbl with a holley avenger 500cfm? I am not trying to go all power, this is a daily local driver car for my son. Im aware the carb is a big carb, but I bought it before fully understanding the CFMs and I do not want to buy another Carb if I don't have too.
Sorry if there isn't enough info or too much!..lol
Thank you!
Brian
Sorry if there isn't enough info or too much!..lol
Thank you!
Brian