Currently I have the Mercury Service Manual Number 23 that covers the 454 7.4L & 502 8.2L. Does anyone know what the item number is for the service manual that covers the 496 mag ho, or possibly have a pdf version of it? I'm not looking for the user manual, but the actual service manual that defines clearances and specifications, ect...

This one ?

https://issuu.com/kfmsd7ueu/docs/mer...496_mag_ho_ser

Edit in: ooops, sorry. Just a partial. Does have link for full .pdf for $20

Got these on Ebay a couple years ago cheap.

Only difference is the camshaft. Bottom ends and heads are identical.

DrFeelgood,

This depends on the model year. Prior to ~'01-'02, the HOs had forged crank and rods. After, they had cast. There was a transition period where you have to run the serial numbers to be sure what you've got. I called Merc and spoke to a service tech. He ran my numbers and confirmed mine was built with forged, but he couldn't tell me without running the serial numbers because it was built in '01.

The ECM flash was also obviously different between the base 496 and the HO, to accommodate the bigger cam.

Thanks. Brad.
(937)545-8991

Slightly bigger airbleed hole in the throttle plate as well for the HO.

i have pdf copy of service manual 30 if this is what you are looking for

The book on the left, do you have the ISBN number, or the specific catalog number?

Is your "manual 30" the short page (30-40 pages), or is it the full version like shown above in another reply?

The book on the left, do you have the ISBN number, or the specific catalog number?