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Steve Miklos
11-20-2009, 06:15 PM
Is the 525 reverse cooled?
Thanks
Steve
MERPerformance
11-20-2009, 08:28 PM
Is the 525 reverse cooled?
Thanks
Steve
I don't believe so. The coolant flows from the circulating pump into the block, through the heads out the front of the cylinder head to the housing that holds the thermostat and the heat exchanger.
Steve, Got check today, Thank you
Steve Miklos
11-23-2009, 08:48 AM
Thanks It looks like the pump is driven by the back of the belt. So I was thinking reverse cool.
Steve
YoungPerformance
11-23-2009, 03:37 PM
It is a reverse rotation water pump, but the coolant flows in the typical path. The water pump (circulation) spins the opposite direction from the engine.
Eddie
Steve Miklos
11-23-2009, 05:22 PM
It is a reverse rotation water pump, but the coolant flows in the typical path. The water pump (circulation) spins the opposite direction from the engine.
Eddie

Thanks!
I have a set of 525 heads I can get on the cheap. I like the 525 FWC setup and was looking at using it. While the heads are fresh and cheap the parts for the FWC are $2100.00. I know the head design is just ok but I am not trying to make more than 600 hp with a 540 CI 9.5 CR. The donor engine is an Hp 500 carb and I feared I would need a serpertine setup if reverse cool was needed.
Thanks
Steve
Lee
11-23-2009, 07:38 PM
FYI, The HP525efi OEM (Edelbrock/Merc) cylinder head has a unique bolt pattern on the exh side, convential BBC exh will not bolt up.
Griff
11-24-2009, 03:59 AM
Thanks!
I have a set of 525 heads I can get on the cheap. I like the 525 FWC setup and was looking at using it. While the heads are fresh and cheap the parts for the FWC are $2100.00. I know the head design is just ok but I am not trying to make more than 600 hp with a 540 CI 9.5 CR. The donor engine is an Hp 500 carb and I feared I would need a serpertine setup if reverse cool was needed.
Thanks
Steve

You will need to use 525EFI headers with the heads though at cost of about 5k
Steve Miklos
11-24-2009, 09:35 AM
You will need to use 525EFI headers with the heads though at cost of about 5k

Thanks, I appreciate you pointing that out.
I actually have a set of CMI's built to non merc specs. on materials but drilled for both the merc and regular heads.
Steve
Blowntaylor
12-19-2009, 12:06 AM
The vanes on the bronze impeller in the Merc water pump are straight. So the pump can turn either direction and will still pull water from hose inlet and push it into the block. The housing is the same as old BBC (1960's) short pump but with Merc impeller.