New Project

[A-craftdrvr]

.I JUST AQUIRED A 1985 MANTRA THAT IS IN GRADE A SHAPE MINUS MOTOR.THE BOAT IS SETUP FOR A B.B.CHEVY(WATER INJECTED HEADERS ECT.)I BUILD ENGINES,RACECARS,ROCKCRAWLERS,BUGGIES AND ALWAYS HAVE HAD A FAST BOAT SO I DO HAVE A LITTLE BIT OF A REPUTATION AT STAKE HERE.
IN THE PAST I ALWAYS TRY TO DO WHAT THEY SAY CAN'T BE DONE,SUCH AS BUILDING BIG HP #S WITH SMALL C.I.,BUT EVERYONE IS TELLING ME WITH A JETBOAT YOU MUST HAVE THE DISPLACEMENTOF A B.B.
WELL HERE IS A COUPLE OF MY OPTIONS,#1 IHAVE A ALL ALUMINUM 337C.I. THAT DYNO'S 640HP THAT CAN BE TONED DOWN TO BE MORE DEPENDABLE.
# 2 I HAVE A 572CI THAT I HAVENT BBEN INTO AND KNOW LITTLE ABOUT EXCEPT THAT I BUILT THE HEADS LAST YEAR.
#3 THIS IS MY CHOICE BUT MY ACCOUNTANT AND BOSS(WIFE)HAS VETO'D.
TAKE THE BLOWN.PROPANE INJECTED 502 OUT OF HER RPM AND USE IT
#4 SELL THE TANTRA ANDKEEP WIFE AND THE OTHER HALFOF MY TOYS

ANY ADVICE ON ENGINE CHOICE OR SETUP WOULD BE APPRECIATED.



R.I.P.#8







































9

[Viper'78]

You should PM blown 509, he has a Mantra with a supercharged 509. It's the yellow one that was at the CT run behind a little black truck.

P.S. Big Block is the only way to go.

Jim

[blown 509]

i have a 1980 mantra tunnel hull with a blown 509 bbc and a berkly 12jg pump it makes over 800 hp and still feels safe.any questions feel free to ask

[A-craftdrvr]

Scrap All Of Earlier Options. Garage Burned To Ground And Nothing Was Saved(local Firefighters Suck)5 Trucks, 30 Men, 1 Hose (spraying Woods) No Brains.
Sorry,still A Little Pissed.anyway ,im Had A 402 That Im Finishing Up Tonight. I Dont Have A Clue On How To Plum The Water Lines,i Have A Couple Of Gauges That Came With The Headers.any Help Would Be Appreciated :d

[A-craftdrvr]

boat is now running,carried to the lake and tweaked on it all weekend.turned alot of heads and hurt a few folks feelings(lol).
when i got back i ordered block and crank for 572 .i'll try to load video and pics asap.