Upgade Your 502 Merc

[Ateco]

Turn your 502 into a heart stopping 540 stroker.

This rotating assembly is a perfect upgrade for your tired 502!
Increase horsepower and torque without sacrificing durability.
Our rotating assemblies feature only the finest race proven components.

*Scat 4340 forged crankshaft ground and micropolished to exacting tolerance. (your choice of 1 or 2 piece seal)

*JE/SRP flat top forged pistons made of 4032 low expansion high silicon aluminum alloy.

*Scat forged H-beam connecting rods are already clearanced
for stroker application and come complete with ARP 8740
7/16" cap screw bolts.

*Your new rotating assembly comes fully balanced and ready to install with rings and Clevite or King race bearing.

* Pre-season special for just $1745, If you wish we can fit the pistons and align the rods for a nominal charge.
Attached Thumbnails

[fountain 47 sc]

How much to install?

[Ateco]

Are you sending us you short or long block? How many hours on the engine? Thanks

[Thunderstruck]

What is the stroke length on the kit??

Any machine work required on the block to make 540 ci or provide proper clearance for the longer stroke?

What is the max recommended rpm for this rotating assbly?

[Ateco]

Originally Posted by Thunderstruck

What is the stroke length on the kit??

Any machine work required on the block to make 540 ci or provide proper clearance for the longer stroke?

What is the max recommended rpm for this rotating assbly?

The stoke length is 4.25".
There is no additional machining required.
Rpm is in the 7,000-7,500 range.

[MOTION35]

what type of hp increase are we looking at ..
WHAT COMPRESSION IS THIS SET UP.
Do you have rotate assembly from 540 to 572. and what the power gain if any ..

[bigmotor]

this is just what I had in mind !!!!
Any cam shaft changes needed to be max efficient power curve ect,,,

I know this is a dangerous question for you ,but what is a typical HP number after the stroker work,starting with the 502 efi as the origanal equipment ?? Is it 540 hp ?? or is that the cubes ??? Assume everything else ,except maybe the cam stays orig. Just a ball park if you could .
thanks Scott

[Ateco]

Originally Posted by MOTION35

what type of hp increase are we looking at ..
WHAT COMPRESSION IS THIS SET UP.
Do you have rotate assembly from 540 to 572. and what the power gain if any ..

HP increases would depend on a lot of things, like the heads you are running etc.
Yes we can provide a rotator for a 572. If you have a tall deck (10.2) it would be no problem, but with a standard deck, we would have to have custom pistons made

[Ateco]

Originally Posted by bigmotor

this is just what I had in mind !!!!
Any cam shaft changes needed to be max efficient power curve ect,,,

I know this is a dangerous question for you ,but what is a typical HP number after the stroker work,starting with the 502 efi as the origanal equipment ?? Is it 540 hp ?? or is that the cubes ??? Assume everything else ,except maybe the cam stays orig. Just a ball park if you could .
thanks Scott

With just the rotator you would probably see a 40-50 HP increase.
With a cam change and reprogramming of your ECU, you could be in the 625 HP range.
And yes, that is a dangerous question!!

[Elite Marine]

Its almost like Ateco knows what they are talking about!!!

You guys cant go wrong working with Bill and Joyce. They know their business, have been doing this forever and will take care of you!