mercury 540 565 camshaft specs

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11-01-2017 | 10:12 PM

#21

fastenuff2

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Joined: Sep 2016

Posts: 34

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From: freeburg illinois

Quote:

Originally Posted by MILD THUNDER

Same cam the 525EFI uses. They use it in the 525, 520, 540, and 565 engines.

are you positive the 565 is only the 525 cam. I have a buddy with two 565s in a small cat and they sound pretty nasty compare to a 525.

11-01-2017 | 11:23 PM

#22

Griff

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Joined: Oct 2000

Posts: 20,271

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From: Omaha/LOTO

Quote:

Originally Posted by fastenuff2

are you positive the 565 is only the 525 cam. I have a buddy with two 565s in a small cat and they sound pretty nasty compare to a 525.

Exact same Merc part number for all of them Genuine Mercury & Mercruiser parts. Racing & Hi Perf Sterndrive Engines

11-02-2017 | 05:08 AM

#23

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Joined: Nov 2004

Posts: 14,143

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From: On A Dirt Floor

Quote:

Originally Posted by MILD THUNDER

Same cam the 525EFI uses. They use it in the 525, 520, 540, and 565 engines.

Quote:

Originally Posted by Griff

Exact same Merc part number for all of them Genuine Mercury & Mercruiser parts. Racing & Hi Perf Sterndrive Engines

You are correct.

I just double checked by looking up each engine individually - 525EFI, 520, 540, and 565. I did this at Genuine Mercury & Mercruiser parts. Racing & Hi Perf Sterndrive Engines
They all have Mercruiser #400-8M0043065

Last edited by SB; 11-02-2017 at 06:28 AM.

11-02-2017 | 05:55 AM

#24

Sonic30ss

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Posts: 1,237

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From: SWFL

IMO it's a great all around cam, sounds nasty but has great dock manners, making 640 reliable hp with it. Displacement will move peak power around.

11-02-2017 | 06:37 AM

#25

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From: On A Dirt Floor

After all that I forgot to list the specs:
525 EFI
298º/306º @ .004"
236º/244º @.050"
.610"/.632" Lift Valve
114º LSA

11-05-2017 | 10:02 PM

#26

mike tkach

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Joined: Oct 2007

Posts: 8,439

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From: yorkville,il

Quote:

Originally Posted by Sonic30ss

IMO it's a great all around cam, sounds nasty but has great dock manners, making 640 reliable hp with it. Displacement will move peak power around.

can you post some info on your engines like cu in,compression ratio and heads?

11-06-2017 | 05:23 PM

#27

Sonic30ss

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Joined: Oct 2002

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From: SWFL

Quote:

Originally Posted by mike tkach

can you post some info on your engines like cu in,compression ratio and heads?

548"
dart 308 head
Callis cranks
eagle rods
je pistons
9.6:1

https://www.youtube.com/watch?v=u5JcAOsrT_M&feature=share

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