Valve clearance.
That space is called "valve lash". It is a predefined gap set on a cold engine when the rocker arm is on the base circle of the cam.
The aortic semilunar valve is auscultated by placing a stethoscope next to the sternum in the second intercostal space.
loud heart murmur at the second intercostal space to the left side of the sternum? Why the murmur. It indicates a valve problem. If a valve does not close tightly, a swishing sound will be heard after that valve has (supposedly) closed, as the blood flows back through the partially open valve.
Retail values are $178.00- $300.00 for circulated coins. Uncirculated are $378.00+
In the forth intercostal space, right to the sternum, probably.
In the second intercostal space, right to the sternum.
The pulmonary valve is best heard in the second left intercostal space along the left sternal border. This location is known as the pulmonic area.
The gdi unit is driven by a cam shaft the valve most likely turns fuel on and off I suspect the valve would be the place where the gas lines converge on the cylinder head
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Probably from the friction of the air squeezing through the small space?
The heart sounds are heard at something called the 4 corners of the chest around the sternum.1) the aortic valve is heard at the 2nd intercostal space at the right sternal margin.2) the pulmonary valve is heard at the 2nd intercostal space at the left sternal margin.3) the mitral valve is heard over the heart apex which is in the 5th intercostal space in line with the middle of the clavicle.4) the tricuspid valve is typically heard in the right external margin of the 5th intercostals space.See the link below: