Intake Fitment
Pinging at part throttle means the engine needs tuning. Not a reason not to give the engine more idle timing. With more idle timing, it will run cooler, which in turn helps with pinging.
Expecting a 500 rpm idle with a 727 & XE 274 cam in a 440 is unrealistically too low. If the pri blades cannot be closed enough, I would be checking for:
- air leaks
- sec blades not fully closing
- PCV not closing off at idle due to low vac [ very likely ]
Pinging at part throttle means the engine needs tuning. Not a reason not to give the engine more idle timing. With more idle timing, it will run cooler, which in turn helps with pinging.
Expecting a 500 rpm idle with a 727 & XE 274 cam in a 440 is unrealistically too low. If the pri blades cannot be closed enough, I would be checking for:
- air leaks
- sec blades not fully closing
- PCV not closing off at idle due to low vac [ very likely ]