I just won an 88 sonic 30ss on ebay and it has 2 350fi motors but no props and idea what props I should go with

When you say 350FI, are you talking small block 5.7litre motors? 300hp. Do you have a link to the ebay ad?

That Boat Use To Belong To A Guy In Erie Pa. I Believe It Had Alpha Ss Drives With Either 21 Or 23 Pitch Mirages. John M.

Andy congrats you beat me by 400$ stinks to be me. I talked to the guy who had it he said that he ran it with 21's and he thought that the 23's would be best. That is the guy you bought it from not the previous owner.

yeah it came down to the last minute I've been looking for a Sonic for almost a year and that was the best deal I've seen so far, now I just have to make the 15hr drive to get it this weekend

Congratulations, post some pics when you have them.

I used to have a 1988 Sonic 30ss with with 350's.
The motors were the 320efi's with alpha ss drives spinning 21 mirage props. The drives were non counter rotating and with the 3 blade props and the higher X dimension I had some trouble getting on plane. Engine and drive package for that year ran extremely well. If you have the same drives I would look into getting the counter rotating gear set for the starboard drive.
Enjoy your boat, I had fun with mine for 9 years.

yeah the one that I bought looks identical to the one in your pic
except for the writing, I don't if the drives are counter rotating or not

Good luck, hopefully it is as nice as the guy said it was. Let us know.

The engine package is rare it was only offered one or two years it the 350 with the EFI and Alpha combination. The motors if orginal are 350 4 bolt motors 300 hp. The Alpha drives are at there limit at 300 hp. Good Luck they are great boats.