489 build critique
#1
Registered
Thread Starter
![Default](/forums/images/icons/icon1.gif)
Currently building 2 engines. 489 gen6 stokers. L29 heads pocket ported with incomes exhaust valves. 12551622 cams 224/224 .483 .483 lift. Air gap intakes. Holley 750 vac sec. Pertronix dist. Hge aluminum exhaust. Rod and main bearings are .002. Ring gap .018. How much power. Any issues?
#2
Registered
![Default](/forums/images/icons/icon1.gif)
what boat will the engine be going in?if it is a performance boat i don,t think you will be happy,but it might work in a low rpm cruiser boat.as far as bearing clearances .002 is to tight for my liking and ring gap depends on what rings you use.their is no standard one size fits all with ring gap.
Last edited by mike tkach; 02-22-2016 at 12:09 PM.
#3
Registered
Thread Starter
![Default](/forums/images/icons/icon1.gif)
It's a Sunsation dominator 32. Won't spin more than 5200. It is twins. I
what boat will the engine be going in?if it is a performance boat i don,t think you will be happy,but it might work in a low rpm cruiser boat.as far as bearing clearances .002 is to tight for my liking and ring gap depends on what rings you use.their is no standard one size fits all with ring gap.
#4
Registered
Thread Starter
![Default](/forums/images/icons/icon1.gif)
Also. I'm looking for 450 each. Nothing more. Figured I would be close considering 502 is 415 and I'm point higher compression with better intake etc
#5
Geronimo36
![](https://www.offshoreonly.com/forums/images/icons/gold_member_star.gif)
![Default](/forums/images/icons/icon1.gif)
what boat will the engine be going in?if it is a performance boat i don,t think you will be happy,but it might work in a low rpm cruiser boat.as far as bearing clearances .002 is to tight for my liking and ring gap depends on what rings you use.their is no standard one size fits all with ring gap.
.002 is definitely on the tight end of spec in my opinion.
What is being used for an oil pump? Is it a HV pump?
#6
Geronimo36
![](https://www.offshoreonly.com/forums/images/icons/gold_member_star.gif)
#7
![Default](/forums/images/icons/icon1.gif)
I think you need a custom shelf cam with the new solid hydraulic roller lifters. Not really, but the cam may be a little small if you're trying to make 450HP. Just my opinion.
#8
Registered
Thread Starter
![Default](/forums/images/icons/icon1.gif)
The pump I smelling m77 high volume. Rings are total seal. Call for .0175. I went 18-185.
I've been going .003 1-4 mains and .0035 #5 and .0025 on the rods. Slightly less if the cranks were cut. That's been working well for me for a number of years.
.002 is definitely on the tight end of spec in my opinion.
What is being used for an oil pump? Is it a HV pump?
.002 is definitely on the tight end of spec in my opinion.
What is being used for an oil pump? Is it a HV pump?
#10
Geronimo36
![](https://www.offshoreonly.com/forums/images/icons/gold_member_star.gif)
![Default](/forums/images/icons/icon1.gif)
It's always .0005 to .0001 larger on the #5. It's a wider journal and ground slightly smaller than the rest. I like to use Merc's Service Manual #3 to reference my specs when I'm putting something together. It's much easier than having to remember. The manual goes from the HP465 all the way up to the 800'sc. The Merc 525EFI runs a little tighter tolerances than what I've grown up using.