CAMARO6 - View Single Post - what's the proper ARP part #for a LT4 wet sump harmonic balancer/crank pulley?!

Schroeder · 07-15-2022, 07:53 PM

I pulled the crank pulley of a 2019 ZL1 LT4 engine. These are torque to yield bolts. ARP said 234-2504, but this is 30mm longer than the bolt that came off the engine. It won't work. Amazon has 234-2503 listed, and I ordered it too. Its package doesn't list the Lt4 as proper application though. The package lists ls1. What's the right answer here? I don't want to install the wrong bolt and be told I can't get my my money back. I have two bolts different places have listed as the right part, but they're different.

Also, the flywheel bolts ARP listed are 234-2801. They're 5mm or so longer than the ones that came off the engine; granted it's an auto Lt4 that had a flex plate on it. The crank shafts don't have a different rear flange on them so they?

07-15-2022, 07:53 PM	#1
Schroeder Drives: 77 Pontiac Trans Am Join Date: Jun 2021 Location: NW, Ohio Posts: 7	what's the proper ARP part #for a LT4 wet sump harmonic balancer/crank pulley?! I pulled the crank pulley of a 2019 ZL1 LT4 engine. These are torque to yield bolts. ARP said 234-2504, but this is 30mm longer than the bolt that came off the engine. It won't work. Amazon has 234-2503 listed, and I ordered it too. Its package doesn't list the Lt4 as proper application though. The package lists ls1. What's the right answer here? I don't want to install the wrong bolt and be told I can't get my my money back. I have two bolts different places have listed as the right part, but they're different. Also, the flywheel bolts ARP listed are 234-2801. They're 5mm or so longer than the ones that came off the engine; granted it's an auto Lt4 that had a flex plate on it. The crank shafts don't have a different rear flange on them so they?