6.2 (L99 LS3) cranks
10-27-2018, 07:48 PM
#1
6.2 (L99 LS3) cranks I bought an LS3 converted L99 that had a boost spike dyno accident.
2 bent rods 2 busted pistons.
The car was an internet purchase, run hard for sure.
The crank rod and main journals are “ok”. A little groovy. It might not polish out. The center main is the worst.
Same casting as 5.3 and 5.7 cranks. But there is a difference. The L99 has gun drilled mains. Anyone notice that? I wonder what the reasoning is.
I’ve heard GM makes a forged crank. Reasonably priced. Anyone know anything about it?
This engine is destined for my C5. I’ll treat it as a big LS1. AFR 210 heads, small cam etc. I didn’t get the 823’s or the intake, so I’ll just reuse my LS1 stuff. Save some good $$$
Ron
2 bent rods 2 busted pistons.
The car was an internet purchase, run hard for sure.
The crank rod and main journals are “ok”. A little groovy. It might not polish out. The center main is the worst.
Same casting as 5.3 and 5.7 cranks. But there is a difference. The L99 has gun drilled mains. Anyone notice that? I wonder what the reasoning is.
I’ve heard GM makes a forged crank. Reasonably priced. Anyone know anything about it?
This engine is destined for my C5. I’ll treat it as a big LS1. AFR 210 heads, small cam etc. I didn’t get the 823’s or the intake, so I’ll just reuse my LS1 stuff. Save some good $$$
Ron
10-27-2018, 08:41 PM
#2
TECH Senior Member
LS7's got the forged crank, with a 4" stroke.
10-27-2018, 09:37 PM
#4
TECH Senior Member
10-27-2018, 11:35 PM
#5
There made here in america Unlike the ones from everyone else... If I recall there made in Moline Ohio. There still cheaper than the chinese ones from every aftermarket source out there.
The LS7 is a 4 inch stroke forged crankshaft.
The LSA and the LS9 are standard stroke 3.622 forged crankshaft.
HTH!
The LS7 is a 4 inch stroke forged crankshaft.
The LSA and the LS9 are standard stroke 3.622 forged crankshaft.
HTH!
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11-01-2018, 07:02 PM
#9
The reluctor ring can be changed without issue. The 8 bolt flexplate may interchange with the 6 bolt, just don't have experience with it to know for sure or not.
11-04-2018, 09:42 AM
#11
TECH Senior Member
iTrader: (7)
Keep in mind that the LS9 (9 bolt flywheel pattern) cranks have a long snout for dry sump. The LSA crank (8 bolt flywheel pattern) is a good option.
I have also heard that the new LT4 cranks (8 bolt pattern same as LSA) will work and are also forged. The LT4 comes in both a wet and dry sump version.
Andrew
I have also heard that the new LT4 cranks (8 bolt pattern same as LSA) will work and are also forged. The LT4 comes in both a wet and dry sump version.
Andrew