Greg, another 460 question

**5akman** · 11-18-2011, 08:39 AM

Hi,
thanks for all the info over the phone the other day regarding my Kodiak 460 going into my Alaska work skiff. Since its a new to me engine that I haven't run and its the off season and I have the engine on the stand, I'm going to take it apart to check wear/clearances. While I'm at it, I'm thinking I might add some flat top pistons to get the compression ratio up around 9:1 or better with the D3ve heads. I was also thinking a cam change at this time. For my lower speed application with the Berk AA impeller would something like the Herbert CH3n with 270/285, 215/225 at .050 and .500/.530 on 112 lobe separation work for me?

Thanks again Greg!

Lance

**greg shoemaker** · 11-22-2011, 01:39 PM

Originally Posted by 5akman

Hi,
thanks for all the info over the phone the other day regarding my Kodiak 460 going into my Alaska work skiff. Since its a new to me engine that I haven't run and its the off season and I have the engine on the stand, I'm going to take it apart to check wear/clearances. While I'm at it, I'm thinking I might add some flat top pistons to get the compression ratio up around 9:1 or better with the D3ve heads. I was also thinking a cam change at this time. For my lower speed application with the Berk AA impeller would something like the Herbert CH3n with 270/285, 215/225 at .050 and .500/.530 on 112 lobe separation work for me?

Thanks again Greg!

Lance

The cam you have selected will certianlly fill the bill.Slightly larger than stock. Will give you good idle quality and make good power up to 4000 to 4500 rpm's.

**LakesOnly** · 12-23-2011, 01:58 PM

Originally Posted by 5akman

Hi,
thanks for all the info over the phone the other day regarding my Kodiak 460 going into my Alaska work skiff. Since its a new to me engine that I haven't run and its the off season and I have the engine on the stand, I'm going to take it apart to check wear/clearances. While I'm at it, I'm thinking I might add some flat top pistons to get the compression ratio up around 9:1 or better with the D3ve heads. I was also thinking a cam change at this time. For my lower speed application with the Berk AA impeller would something like the Herbert CH3n with 270/285, 215/225 at .050 and .500/.530 on 112 lobe separation work for me?

Thanks again Greg!

Lance

If your Kodiak 460 is from the late 1980's or early 1990's, then it very likely already has forged flat top pistons installed from the factory.

Also, the OEM camshaft from the Kodiak 460 of the same era will not have the typical passenger car cam like the runabout jet boats of the 1970's and early 1980's. Instead, it will have a cam with almost 0.500" valve lift and a 216*@0.050" Intake/220*@0.050"Exhaust duration and so the CH3N cam you are considering would hardly be any improvement...if at all.

The presumptions about the internal components in your Kodiak 460 may not apply if it has been rebuilt and/or had its marine-specific external componentry transferred over to a different long block.

LO

**5akman** · 12-24-2011, 04:57 PM

I pulled the heads off and it has the forged flat tops. I'm going to go through the heads with some minor amatuer porting/blending and add larger stainless one piece valves. The original cam is staying in place although I'm swapping out the timing set.

Lance

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Greg, another 460 question

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