New to me P337 - Is this a problem?

[GearUp]

I'm told our plane had a similar problem years ago and the A&P spent a significant amount of time on the baffling and plugging holes (i.e. spark plug wires, etc.) that let air bypass the cylinder cooling fins. And after he was finished the rear ran as cool or cooler than the front at cruise.

[Rule303]

Thanks to all.

A combination of long delays getting a simple avionics upgrade finished, and a subsequently bored and grounded company pilot who is also a mechanic seems to have fixed the problem.

A few days spent aligning and plugging all baffles seems to have done the job.