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#1
08-21-2014, 07:19 PM
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SGI Forged Crank
Are these factory seconds? It's my understanding SGI produces the forgings for all other China based companies (Eagle, Scat, Ohio, etc). If so, any one know why these are over $200 less than other vendors? http://rover.ebay.com/rover/0/e11051...AMOTORS%3A1123
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Will Rivera '69 Firebird, 400/461, 290 Eddy D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '69 LeMans Vert, XS 350, #47 heads, TH400, 10 Bolt 3.23 gears, work in progress ‘66 Lemans, 455, 310 KRE D-Ports, HR 236/245, TH400, GV OD, 12 bolt 3.73 gears - see it here: https://youtu.be/RP_s1wJKm_Y?si=K0NZxoTyaGcj8Dcb |
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#2
08-22-2014, 04:55 AM
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anyone?
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Will Rivera '69 Firebird, 400/461, 290 Eddy D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '69 LeMans Vert, XS 350, #47 heads, TH400, 10 Bolt 3.23 gears, work in progress ‘66 Lemans, 455, 310 KRE D-Ports, HR 236/245, TH400, GV OD, 12 bolt 3.73 gears - see it here: https://youtu.be/RP_s1wJKm_Y?si=K0NZxoTyaGcj8Dcb |
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#3
08-22-2014, 04:59 AM
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We built a 505 with one of the first SGI crankshafts that were available. It was supplied by KRE with one of their blocks, 505cid, and makes up near 750hp. The cranks was spot on in every area and didn't need to be touched, just plug and play. It has lived a good life at that power level, car runs into the high 9's.
We had the engine out to be freshened up last year after it destroyed the oil pump drive. The cranks actually hit the drive and busted it up pretty good. The cranks was in mint shape and all the bearings were fine. We cleaned up the pieces, rolled new rod bearings in it, new valve springs, replaced all the cracked Scorpion rocker arms with Crower Enduro's, and right back in service......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#4
08-22-2014, 08:52 AM
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Are you aware of any factory seconds? I ask due to the $200 difference...
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Will Rivera '69 Firebird, 400/461, 290 Eddy D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '69 LeMans Vert, XS 350, #47 heads, TH400, 10 Bolt 3.23 gears, work in progress ‘66 Lemans, 455, 310 KRE D-Ports, HR 236/245, TH400, GV OD, 12 bolt 3.73 gears - see it here: https://youtu.be/RP_s1wJKm_Y?si=K0NZxoTyaGcj8Dcb |
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#5
08-22-2014, 10:27 AM
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I've seen some "H" beam rods are really low prices that were available due to being off some for fit/finish, so yes, they would be considered "seconds".
Not sure about crankshafts, but anything bought from any source needs to be checked for size, fit, finish, etc, that's just part of complete engine building and getting better sleep at night!......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#6
08-22-2014, 10:57 AM
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We have used several SGI cranks. Never a problem with any of them. They balance easy too. So I would say, no on the seconds.
Those guys selling them for that, probably bought into a killer pricing deal so they could undersell others. Make just a few bucks off of each, but sell a lot. A lot of them E-bay guys do that.
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#7
08-22-2014, 02:19 PM
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Quick question about those listed in eBay; Some are listed as Forged 4340 Nitride and another is listed as Forged 4340 Steel. Is there a difference or is it two different words for the same thing?
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Let me have a Diablo sandwich and a Dr. Pepper and make it fast---I'm in a goddamn hurry! - Mike 1967 GTO 
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#8
08-23-2014, 10:41 AM
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4340 is a grade of a steel alloy. Nitride is a surface treatment that makes the bearing surface harder.
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Tim Corcoran |
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#9
08-23-2014, 10:50 AM
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Quote:
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Let me have a Diablo sandwich and a Dr. Pepper and make it fast---I'm in a goddamn hurry! - Mike 1967 GTO
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#10
08-23-2014, 11:48 AM
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Anyone else notice all strokes even with different rod journals are advertised THE same weight?
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If you cant drive from gas pump to gas pump across the map, its not a street car. http://s207.photobucket.com/albums/b...hop/?start=100 |
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