GM 572 crate eng.
01-13-2009 | 10:57 AM
#11
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From: Missouri
[QUOTE=CROWD CONTROL;2776669]I am running marine msd and the engine came with brass freeze plugs and the 632/632 254/264 @.050 cam works just fine with 650 fp of torque. Like I said going I have 309 trouble free hours on the engine. And if it blows all apart tommorow I will buy another and stick it back in their.
What motor did you replace? Would it drop into where a 496 was?
Thanks
What motor did you replace? Would it drop into where a 496 was?
Thanks
01-13-2009 | 11:06 AM
#12
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From: Look out shoals
This old thread may give you a little more insight.
http://www.offshoreonly.com/forums/g...ing-today.html
http://www.offshoreonly.com/forums/g...ing-today.html
I really like the engine and have had good service but I would really like to here what a well known engine builder has to say about how much clearance is needed in the valve guides. You cant build a engine but so loose and get it to last,
01-13-2009 | 11:11 AM
#13
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From: Look out shoals
[QUOTE=twanger;2776889]
My boat had a 454 originally and yes the engine mounts are the same. The 572 is a tall deck, it is a bit wider at the top from head to head. I had no problems
I am running marine msd and the engine came with brass freeze plugs and the 632/632 254/264 @.050 cam works just fine with 650 fp of torque. Like I said going I have 309 trouble free hours on the engine. And if it blows all apart tommorow I will buy another and stick it back in their.
What motor did you replace? Would it drop into where a 496 was?
Thanks
What motor did you replace? Would it drop into where a 496 was?
Thanks
01-13-2009 | 08:43 PM
#14
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From: Detroit River/ lake Erie
I am running marine msd and the engine came with brass freeze plugs and the 632/632 254/264 @.050 cam works just fine with 650 fp of torque. Like I said going I have 309 trouble free hours on the engine. And if it blows all apart tommorow I will buy another and stick it back in their.
I feel for the money you can not beat this engine 12,500 and no dry exhaust needed
ZZ572 are built around an all-new generation VI one piece main seal tall deck 572 cid with approximately 9.6:1 compression, 620 hp at 5,500 rpm, and 650 ft./lbs. of torque at 4,500 rpm with a recommended max rpm of 6,000. These all-new race blocks have a 4.560 in. bore and are filled with forged 4340 steel cranks with 4.375 in. stroke, shot peened forged 4340 H-beam rods, and forged aluminum pistons with full floating wrist pins. Redesigned rectangular port aluminum cylinder heads with 118cc combustion chambers, Stainless steel valves at, 2.25 in. intake side and 1.88 in. exhaust side. Hydraulic roller camshafts are used with valve lift being .632 in. intake, and .632 in. exhaust side, duration at .050 in. for intake is 254 degrees and 264 degrees exhaust side. Hardened chromemoly retainers are used with dual valve springs 1.50 in. coil diameter, 1.800 in. installed height with 197 lbs seat pressure. Aluminum roller rockers with 1.7:1 ratios, high performance one-piece push rods are installed. New GM Performance Parts tall deck single plane intake manifold and 850 cfm Demon carburetors deliver the air. A GM distributor handles ignition, spark plugs and wire are included. New screened and louvered windage trays, High-rpm torsional dampers are used. Pump gas friendly, massive torque and horsepower, all from GM Performance Parts.
I feel for the money you can not beat this engine 12,500 and no dry exhaust needed
ZZ572 are built around an all-new generation VI one piece main seal tall deck 572 cid with approximately 9.6:1 compression, 620 hp at 5,500 rpm, and 650 ft./lbs. of torque at 4,500 rpm with a recommended max rpm of 6,000. These all-new race blocks have a 4.560 in. bore and are filled with forged 4340 steel cranks with 4.375 in. stroke, shot peened forged 4340 H-beam rods, and forged aluminum pistons with full floating wrist pins. Redesigned rectangular port aluminum cylinder heads with 118cc combustion chambers, Stainless steel valves at, 2.25 in. intake side and 1.88 in. exhaust side. Hydraulic roller camshafts are used with valve lift being .632 in. intake, and .632 in. exhaust side, duration at .050 in. for intake is 254 degrees and 264 degrees exhaust side. Hardened chromemoly retainers are used with dual valve springs 1.50 in. coil diameter, 1.800 in. installed height with 197 lbs seat pressure. Aluminum roller rockers with 1.7:1 ratios, high performance one-piece push rods are installed. New GM Performance Parts tall deck single plane intake manifold and 850 cfm Demon carburetors deliver the air. A GM distributor handles ignition, spark plugs and wire are included. New screened and louvered windage trays, High-rpm torsional dampers are used. Pump gas friendly, massive torque and horsepower, all from GM Performance Parts.
01-16-2009 | 10:31 PM
#16
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From: Look out shoals
Yes I am the part # is 12361323 it is a GM rocker with the bowtie on them. 309 hours and going strong
01-16-2009 | 10:39 PM
#17
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From: Look out shoals
I need some concrete evidence on this GM 572 info. A few are saying that the engine needs more clearance in the guides and maybe other places. Well I have searched all over and I can not find the builds specs on the clearances. If somebody can find these and post a link I would like to read them and compare them to factory merc. engines.
Like I said I am still running strong after 309 hours on mine. But is this due to the fact mine was in a auto for the first 2500 miles allowing the engine to loosen up. Or did I get lucky.
All I have to go on is hear say with no proof somebody show me the clearance specs
Like I said I am still running strong after 309 hours on mine. But is this due to the fact mine was in a auto for the first 2500 miles allowing the engine to loosen up. Or did I get lucky.
All I have to go on is hear say with no proof somebody show me the clearance specs
01-17-2009 | 10:49 PM
#19
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From: Fort Worth, Texas
I need some concrete evidence on this GM 572 info. A few are saying that the engine needs more clearance in the guides and maybe other places. Well I have searched all over and I can not find the builds specs on the clearances. If somebody can find these and post a link I would like to read them and compare them to factory merc. engines.
Like I said I am still running strong after 309 hours on mine. But is this due to the fact mine was in a auto for the first 2500 miles allowing the engine to loosen up. Or did I get lucky.
All I have to go on is hear say with no proof somebody show me the clearance specs
Like I said I am still running strong after 309 hours on mine. But is this due to the fact mine was in a auto for the first 2500 miles allowing the engine to loosen up. Or did I get lucky.
All I have to go on is hear say with no proof somebody show me the clearance specs
Personally, I think someone is trying to jerk your chain on the more clearances thing...meaning I think it is a crock of stuff. I know several people out here running the crate motor that you are probably talkingabout and they got it from Jegs. They are running dry exhaust, but they are NOT having any issues at all and the motors are working perfectly...just as yours is.
01-18-2009 | 09:57 PM
#20
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From: Look out shoals
I am running imco exhaust and my water dumps in at the end of the riser. I never had any reversion problems with the cam. best run is 85.4 in a 28 footer I feel maybe if I played with a lot of props I might get better speeds I am running a stock 28p bravo on a 1.5 xr drive. Its between night and day over the 454.
