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Merc 377 Scorpion top ends?
I have blue 377 scorpions with 290hrs on them. As far as I know, they had whipples installed at around 100hrs. Looking for when I should do top ends. No current issues, just curious.
Tim |
I can't find cam or valve spring specs for that motor, but it is custom ground by crane. 300 hrs is usually considered the limit for high perf valve springs. When in doubt, change em out...
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That's along my thought process too. I was considering 350hrs, might do it sooner now.
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I believe the heads were RHS and cam done by Crane as stated. Unsure of overhaul time. I don't think it was like the HP500 motors though.
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True dat. Big heavy valve, rocker, .6-something lIft. But popping the keepers and replacing a 1-3 hundred buck set of springs...
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Originally Posted by dereknkathy
(Post 4576250)
True dat. Big heavy valve, rocker, .6-something lIft. But popping the keepers and replacing a 1-3 hundred buck set of springs...
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The 400hpScorpions ?
If so, I found a quote from myself years ago:
Originally Posted by sb
Run down on the 383cid Scorpion:
6000+rpm rev limit. :)hand 5600-6000 rpm recommended operating rpm at WOT Tunnel ram intake RHS heads w/ 2.08/1.60 valves .575, .596 lift HR cam with 1.6 roller rockers Forged steel crankshaft forged pistons 9.6:1 compression - 91 octane fuel minimum CMI headers In case I made a typo click here: http://sites.mercurymarine.com/porta..._schema=PORTAL and make sure to click on the .pdf containing the rest of the build info. |
Originally Posted by Trash
(Post 4576532)
The lift was not .6 something. It was low .5, like .51x/.51x or in that ball park. I've seen the specs just can't fine them. 2.05 and 1.6 exhaust, so yes big on the intake.
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Were the scorpions rated 400 horse? Seems like a 383 with sb specs above would be more than 400.
But then again with a bigger boat it seems a big block is faster even if it has less horsepower on paper. Case in point a 415hp 502 is usualy faster than a 400ish horse 383. |
I believe there where different Scorpions..not sure..?????? .that's why I made sure to put up which one I was referencing. The 400HP Scorpions.
And yeh, I agree,most dyno's would show more than 400hp with that set-up...I'm sure. Remember, Merc has to put power ratings where they will sell not only this motor but other motors. ust like the 525EFImaking 560hp or so. :) |
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