800sc question
08-01-2015, 09:44 AM
#2
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gm bowtie tall deck block.early ones had la billet crankshaft but they switched to lunati crankshafts.a lot of the lunati cranks[including mine] broke the crank.imo the lunati 4.5 stroke crank is junk.i don,t know the specs on the cam but they were hyd flat tappet.
08-03-2015, 04:18 PM
#5
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240/240 .559/.559 lift, flat tappet cam.
They were basically stump puller 5000RPM engines. Most guys who had them, and left stock, would go 300,400, even 500 hours before going thru them. The valvetrain was very mild, and simply just easy on parts. While they were called 800sc's, they actually made around 700HP at the prop. Question is, with what drive was that measured? Merc never offered it with a bravo, most were wet sump 6's I believe, or SSM IIIA or V. They were alot more reliable than the 900sc merc from a longevity standpoint.
They were basically stump puller 5000RPM engines. Most guys who had them, and left stock, would go 300,400, even 500 hours before going thru them. The valvetrain was very mild, and simply just easy on parts. While they were called 800sc's, they actually made around 700HP at the prop. Question is, with what drive was that measured? Merc never offered it with a bravo, most were wet sump 6's I believe, or SSM IIIA or V. They were alot more reliable than the 900sc merc from a longevity standpoint.
08-14-2015, 01:25 AM
#6
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1994 800 SC was different a tad bit than years past especially ignition set up . Some info - SC was a B&M with displacement of 420 cubic in.with SC gear ratio of 1.17:1 with boost of 8 psi. - Intake manifold B& M aluminum - heads were GM cast iron with comp ratio of 7.5:1. rods were Forged Carillo, also JE Aluminum pistons and Speed pro rings,, Lunati forged steel crank, Crane Hydraulic cam, lifters, pushrods and crane roller rockers.
Holley 700 cfm - 2 carbs, holley fuel pump, Melling high volume oil pump, CMI exhaust headers, Mercruiser T bolt IV ignition with rev limiter.
Holley 700 cfm - 2 carbs, holley fuel pump, Melling high volume oil pump, CMI exhaust headers, Mercruiser T bolt IV ignition with rev limiter.
08-15-2015, 09:57 AM
#7
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The last roots 572's i saw promos on ran 2 piece headers and stamped 8 qt pans..seems like for the money alot of guys took the bulldogs and ran prochargers or whipples ,12qt pans (and the best starters money could buy)
And were pretty satisfied. Easier on the crank snout too
And were pretty satisfied. Easier on the crank snout too
