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Knock sensor location and mystery bolt location

Jchandu

New member
I have a 2004 Searay 240 Sundeck with a 5.7 vortec Mpi.

Background: Bought this boat with a cracked cylinder head. Motor was completely disassembled. All I got was three boxes of parts. The engine that was in it was a 5.0 Mpi. Serial# 0M620208. I decided to upgrade to a 5.7l since I was doing a complete rebuild on the motor. So everything is done, back together and ready to bench start.

Question#1:
Using my service manual wiring diagram, it looks like I should have two knock sensors (odd/even). Tracing my wiring harness I only have one connector for a Knock Sensor. The connector is located on the left rear of the engine. Where is the left side knock sensor located? Should I have two knock sensors?

Question#2: On the rear of the engine where the the block and intake join and close to the distributor is, there is a 3/8” threaded hole or a 1/8” pipe thread hole. When I primed the oil pump, oil was coming out of this hole. Am I missing a plug? Sensor?

See attached photos.

Thanks you all your help.
 

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1 probable only have one knock sensor
2 that is where the oil pressure sender for the gauge goes or if the sender is on the port side near the oil filter then plug the hole at the manifold/block area
 
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