Hi, The Type Certificate Data Sheet says the A4A is similar to the A3A except it has a stiffer crankshaft. Based on my brief research, it doesn't appear as thought either of these engines have provisions for installation of a constant speed prop. However, this research is preliminary; I suggest you continue to research this.
The A3A is an approved engine for installation on the Cherokee 180. Just to make sure I/we are on the same page. This engine is approved on PA 28 serial numbers: r S/N 28-03; 28-671 through 28-5859; and 28-7105001 through 28-7205318.
If the airplane you're looking at has a serial number in this range: for S/N 28- E13, and 28-7305001 through 28-7505260; the only engine approved in the Type Certificate Data sheet is the A4A or A4M.
If you're looking at an Archer II, serial numbers: for S/N 28-7690001 through 28-8690056; 28-8690061; 28-8690062; and 2890001 through 2890205, the only engine listed in the TCDS is the A4M or A4A with a specific carburetor.
If you need more help, or want additional information, please post.
Happy Flying,
Steve

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I have a O-360-A3A engine with only 600 TT on it and I am looking for a Cherokee 180 airframe to put it in. I am partial to the D model but it came with the A4A which is exactly the same engine without the hollow crank. After installation I would like to pursue mounting a constant speed prop on it. First up though is whether the A3A is legal to mount on the D. I would head back to the C if it is not allowed..

Thanks,
Steve

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Update after talking to Suzanne at Merlyn. There are no lubrication points on the Black Magic system. So send the Mouse Milk back. Suzanne also told me that there are no time or calendar mandate actions required to maintain the system.
Merlyn does recommend that the system be sent back to it for inspection and repair as necessary when an engine is changed.

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