hrm..thats more than booth my motors put together..from what I have heard, the gm truck motors arent that difficult to marinize to use as a base?? then a complete rebuilt with a 383 kit??

I think that ZZ383 crate motor makes 425 hp, 450 ft lbs/tq. My buddy has about 150 hrs on his. So far zero problems.

My mirage had the original Mercruiser Tempest 300HP engine with 650 hours on it. It ran fine but the oil pressure was getting low, and I wanted more power. I did a lot of research and even talked to Mercruiser tech dept on what to do. Mercruiser recommended upgrading to vortec type heads, so I ended up with a vortec head style 383 crate engine.
I found it a wash ($$ wise) as to rebuild my engine or get another one already done, so I just got another engine. It is a 4 bolt with Eagle crank, hyper pistons (10:1), new big valve heads, steel roller tip rockers, gear drive, milodon pan, ARP hardware, and a performer rpm manifold with 750 marine carb. I think the cam is around 525 lift. I got the engine with a new balancer and flywheel as the 383 engines have a different balance than our stock 350s have. I had to get new valve covers also as the vortec heads use the centerbolt style covers (and have a different intake bolt pattern).
I only have about 3 hours on the engine, but I tell you WOW. I gained about 600 RPM. I have a new prop waiting to be tried out when weather permits.
I'm very happy with the power of the new engine, way more torque.

Wayne

1988 Sonic 30SS- complete rerig 2005/6.....& still in progress with new power/again! Drives & rides great.

1st pic- original boat( see attachment below pics)
2nd- as repainted by Too Old/Trick
3rd- as updated/rerig 2005/6

1972 24.6' Spectra V-drive , LS-6


1976 Spectra 20 ca 1982 >

1984>

ca 1996 >


1990 Mirage 257 , twin 377's

My 1980 SCARAB S-Type
(2) 454/TRS

1987 272 sr-1 formula, 383 small blocks 425 hp, runs great 69.8 on gps. moving up to 1996 382 formula hp 500's

Wow! It sure looks well preserved.

Beautiful boat.

Little late on this thread here is mine: 1986 monti christi redone in 02 and recently added to the oso classifieds.

1986 Apache Scout-for sale on O.S.O.