Don't waste your time with the Hydromotive quad iv in any pitch. Mine came with one. 5 minutes after leaving the dock i had to go back to put the 23p mirage plus back on. It spun right up but did't lift the bow at all. Topped out around 30-40 mph. I get 63 mph on the gps with the 23p mirage plus. Power is a stock carbed 502.

my 89 242ls run a best of 65.5 on gps with a 502 cid with mild cam. EMI thunder manifolds. 23 mirage plus

I think you'll find the 21p mirage + will work the best. That seems to be the consensus for a stock 242. I have a 233 with 454 mag / bravo 1 and run the 21p + @ 56/57 and 4800-5000 rpm. I have never tried the non + mirage, so I'm not much help there.

My bad, had GPS on Knots . Today I was hit in a high of 59 mph at 5100 rpm.mostly wanted to only get to about 57 ish. Mirage 21plus. 454 with 400 hp.

I am running a 23P thunderbolt at 4800 on my 88 242LS with a stock 454 mag.