answer
.035
.035 inch........for the ABSOLUTE best power use Autolite AT3 spark plugs. I had 65 327/365hp in 65. Motor Trend did a test on spark plugs using a 389 cu in GTO engine. They gained ten (10) HP by simple change the plugs to Autolite AT3. Good luck.
The Chevrolet 327 plug wire diagram can be obtained from most Chevrolet dealerships. The diagram can also be found in Chevrolet service manuals.
Depends on weather your referring to a modern vehicle with a fuel injection 327, or a classic car. Depends on if points or electronic ignition . An example being a 68 Chevy 327 with points type distributor I set the gap at .035 now same engine with electronic ignition HEI distributor Icap a bit larger a max of .045
The plug gap is 35 and the dwell setting is between 28-32, I like to set them at 30.
just ask them at the parts store, they will be able to tell you what plug you need.
Spark Plug: 0.025", Low: 1 1/8 turn, High: 1 1/4 turn.
did you replace the spark plug wires?
There are a few things that can cause this problem. The spark plugs could be bad, the distributor cap could be off, the spark plug cables or boots could be damaged.Ê
No. The 327, is a small block.
the plugs are already gapped On edit: That is not an answer, and you never install plugs without checking the gap. The correct answer is .035".