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1978 cusader model 350 454 spark plugs

P

powerboater41

New member
"I have changed the plugs and

"I have changed the plugs and the ones that have been in the boat for the last 2 years are AC delco r45ts. not the marine version but on freashwater lake. The owners manual says it calls for ac mr43t or champion rbl-9y. The engines have been converted to electronic ignition. I dont exceed 2,000 rpms with this boat and do a lot of driving at 1,400 - 1500 rpms. Any thoughts? Thanks in advance"
 
"Go with what the owner's

"Go with what the owner's manual calls for, or one step hotter since you don't run it hard.


Jeff"
 
"the 45's are two steps ho

"the 45's are two steps hotter than the 43's and the S is extender tip (aka projected nose). If the old ones came out ok, you should be ok. a little anti-seize on the threads would be worth the effort. If the old ones came out bone white or glazed, go down to the 44's"
 
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