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Old 03-11-2016, 04:04 PM
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Originally Posted by Wally
I don't think those are 6.2's Look close at the valve covers....center bolt style like the vortec 5.7 motors.....the 6.2 motors are LS series engines and they have different valve covers on them....i thought the scorpion engines were the 383 stroker motors based on the vortec roller 5.7 engines....and if memory serves me right i thought GM introduced the 6.2 in 2007???? dont know if anyone was using anything like that before in a boat....
I had a 2002 gmc 3/4 ton p up with a 6.2. If I remember correctly that motor had aluminum pistons that rattled until warmed up.
Don t know if the blocks,or internals were the same as what Merc used? Probably the same block crank,rods & pistons? I wasn t impressed with that motor. GM replaced pistons & rings on mine, & one piston bore must have been over sized a little because the rattle never went completely away.
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Old 03-11-2016, 04:10 PM
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Originally Posted by Mr Maine
Wally, this isn't the LS 6.2, its a 350 with a 3.75 stroke crank to give 377 cubes (6.2 liter). They were 320 horse in the standard offering.
So is that a shorter piston with a longer stroke? or what??
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Old 03-11-2016, 04:23 PM
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Originally Posted by Splitdecision271
Did you read the description???? They are 6.2s. Photos show 53 hours on the meters, but don't know when that picture was taken. Not stock manifolds, were replaced can't really tell which brand. Stock could be 28p or possibly 26p Bravos. It's a 70-72 MPH boat. I've seen a couple of these low priced, poor health, Formula's lately. Just be caution if serious about it.

2001 Formula 312 fast tech,2001 FORMULA 312 FASTTECH, IMMACULATE CONDITION, 31 FOOT, STEP HULL DESIGN,TWIN MERCRUISER MPI(FUEL INJECTED), BRAVO ONE DRIVES,POWER TRIM TABS , POWER STEERING, BENNETT ELECTRIC TRIM TABS WITH INDICATORS, AFTERMARKET STEREO SYSTEM, FRESH WATER SHOWER, T-MERCRUISER MX 6.2 MPI'S, BRAVO-4 STAINLESS BLADED PROPELLERS, GAFFRIG GAUGES, GAFFRIG THROTTLES,ELECTRIC BOOSTER SEATS, LUXURIOUS COCKPIT WITH FULL CARPET, COCKPIT COVER, SWIM LADDER, FRESH WATER FLUSH. ALL MAINTENENCE CURRENT AND UP TO DATE,WATER READY!!! POOR HEALTH FORCES SALE! $29,995.00 386-314-9527 $29,995.00
There is another used 2000 312 on boat trader with stock 454s. So thats 330 @ the crank right? He states hes running 28 pitch @ 65 mph. I thought that was weak for stock big blocks. I saw in BOAT TESTS a 312 w 454 mags @ 385 hsp. The test said 72 mph. 1.4 mpg was the best @ 3600 rpmsh.
Soo, 6.2s @ 320 hsp should be the same as the stock 454s I m thinking,400 pounds less weight. But,won t have the torque. I ll bet this 2001 w 6.2s is running 26 pitch. That be my best guess..
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Old 03-11-2016, 05:13 PM
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Originally Posted by Mr Maine
Wally, this isn't the LS 6.2, its a 350 with a 3.75 stroke crank to give 377 cubes (6.2 liter). They were 320 horse in the standard offering.
Any idea what the MX stands for? I did a search & found that MX motors were 340 hsp..
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Old 03-11-2016, 06:46 PM
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6.2 in in a 2002? Should have been a 6.0 but either way those are ls style engines totally different than the old style 305/350/6.2. The 6.2 was by merc never ever went in a car or truck.

The wrist pin is raised 1/8 inch to make up for the upward half of the increased stroke. Itso just a 383 sbc except stock 4 inch bore. They were 320 horse.

The 454mag has 75 more horse than the 7.4mpi and will be quite a bit faster. The 6.2 and the 7.4mpi should run similar although the 6.2 may have a smaller prop and Rev higher.
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Old 03-14-2016, 08:06 AM
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To put it into perspective, my 312 with 1250 hp only runs upper 80s, and might touch 90 on a good day. Twin 454's with whipples.
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