Re: 1996 mercruiser 5.7 with thunderbolt ignition ... Top End knock Please Help
as for inversion or sucking water just because its a AUTOMOTIVE cam.... lol like 99.9 percent of the rest of marine engines dosent mean it will be a problem
2, split duration cam recommended for most marine uses, exhaust having a longer duration and higher lift, makes up for how restrictive most marine exhausts are, more gases going out means no water coming in!!
3, The equal duration/equal lift cams are for higher rpm uses, like a performance 350, now these do have a risk of sucking water IF you dont do your home work, so with that been said, i guess thats why we have thru-hull exhaust ehh??
I wanted to let this go, but it was directed at me so I couldn't
and it's simply contradictory on its own. First you say there is no difference, then you give two examples of why cam selection is important. Thru hull exhaust does NOT eliminate REversion risk; only dry exhaust or proper cam selection does. Another Mod removed your absolutely false statement about carbs. Please, when replying to technical threads, let's keep the info factual, and safe, and at least try and not contradict yourself while trying to prove you know something. Doesn't work and it's simply confusing for those who are actually trying to pay attention.
BTW, very few people here have ever claimed much marine difference for a SBC long block except the cam, brass core plugs and sometimes head gaskets are mentioned. When it comes to fuel systems and electrical they ABSOLUTELY need to be marine rated, and if anyone claims differently on this site they will be corrected.
Sorry coopin, this poor thread has just had issues. Let's all hope your engine doesn't. It sounds like it was put together correctly and I wish I was playing along with your first test runs. Good luck!!!
