Scarab III props

[MILD THUNDER]

My buddy has a 1988 Scarab III. Originally was a 370/trs boat. Previous owner had the 370's rebuilt, and Im sure they upgraded the cams, and they installed roller rockers. Still running stock merc exhaust, and q-jet carb, GM High rise intakes. Anyways, he just bought the boat, and it came with 24P Bravo props. He's only getting about 4200 RPM trimmed out, no tabs, and a clean bottom. His speed is about 54-55 max. I suggested going down to some 21P props, to get the engines in thier powerband, and take the load off them. Out of the 3 sets of props I have, which do you think should go on first???

22P Hydro QIV
Quicksilver mirage 23P (not Plus)
19P Revolution 4's.

[MILD THUNDER]

Here she is

[Prostreeter]

I would say the mirage 23.A mirage plus would probably be better though.I think you'll just blow the 19 revolution out of the water.I have no experience with the hydo prop.

[Scarab3DMC]

OK when I bought my III it had crate 502'. /750 HOLLEYS. stainless marine II exaust TRS drives..I did alot of prop testing...had 19''-21" 23" & 25" mirage plus.. then I tried Q-4's..22"- 26"..best prop hands down was a Q-4- 22" pitch.. boat ran 58-62 mph on gps..hope that helps, The handling and midrange also the best with the Q-4"S...Dave