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anyone running gm 572/620 engines

Old 08-12-2013, 10:09 PM
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Found a deal on one and my 38 scarab avs is a tank with stock 502 efi mags. Would like some info quickly if anyone can help. may pull trigger tomorrow
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Old 08-12-2013, 10:28 PM
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i ran a pair of 572s they made 640 a side in my mistress that was also a tank. i took charlie mcarthy out for a ride, he drove the hell out of that thing and taught me how to slide it around in the corners, he was impressed with the engines... that say a LOT. rm
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Old 08-12-2013, 10:46 PM
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thank for the info. just bought one on the phone just now or you could say i stole for the price i paid. i built up some bulldog 540 made over 600 in my cig bullet and mid range throttle was impressive. My 502 mag mpi just have no guts for a boat that weighs 10200 dry even being in an avs step hull, its like having electric motors.
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Old 08-12-2013, 10:51 PM
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Old 08-12-2013, 10:56 PM
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mine should have made more hp, i had em dyno'ed by randy at cobra, he said he thought the intakes weren't big enough for my combination. i bought the pair of mine from tommy at chief for 8k for the pair, carb to pan in pieces. there was a mis matched connecting rod in one eng but they were balanced out i resized em and ran arp hardware through out, i turned them 6800 with a hyrdaulic roller valve train... you will like em, that extra 1/4 in of stroke you will definitely notice over your 540's...rm
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Old 08-13-2013, 10:05 AM
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Originally Posted by ratman View Post
i turned them 6800 with a hyrdaulic roller valve train...rm
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Old 08-13-2013, 11:30 AM
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I have a pair of them in the Power Play. They make good power and are pretty conservative. I had a water hose bust and ran one pretty hot two weeks ago. Just to be safe and out of curiosity as to what parts manufacturers they actually use. I went ahead and pulled it down and freshened it up. They really are nice pieces, bowtie block of course, all 4 bolt billet caps, Callies stealth crankshaft, Manley rods, all arp bolts, and SRP gas ported pistons. From GM they are a nice piece.
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Old 08-13-2013, 11:36 AM
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You should check the valve stem to guide clearances. Stock new they are great motors but not set up for sustained high rpms so the clearances may be tight. Also I would put a 12-14 qt pan on them. I would also get a cam from Bob Madera to make sure reversion is not an issue. The engines have all good parts.

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Old 08-13-2013, 11:51 AM
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You should check the valve stem to guide clearances. Stock new they are great motors but not set up for sustained high rpms so the clearances may be tight. Also I would put a 12-14 qt pan on them. I would also get a cam from Bob Madera to make sure reversion is not an issue. The engines have all good parts. Also you need to relocate the oil filter to remote.

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