Yellow_ICC_OK

Does anyone have any info on the 525sc factory iron heads? Square or round? Combustion size? I called merc and surprisingly they dont know! Part number is 826363A1...

Thanks,

Car Biz

iTrader: (1)

i believe they were 990 rectange ports. This was four a GEN IV block. It think the later ones were 088 rectangle and i think that was for a GEN V. Chamber was 188 or119cc .

Yellow_ICC_OK

That all sounds right. I was thinking it was gen4 myself. Was there anything special about the plug locations or anything that you remember?

Thanks

badluck

I have a 525SC gen V.
Castings are 088, rectangular, adjustable valve train (1,88 & 2,19 valves, combustion chamber is as stated earlier 118. Plug location is "GM stock".

bl

Griff

badluck is right on. They are just stock GM rect port heads.

Yellow_ICC_OK

Thank you jesus. Seriously, this motor is hard to find info on! Even merc plays dumb...any of you guys have a manual or know where to get one???

thanks!!!!

Griff

Here is a link to the factory manual. I had one and it has a lot of good info. I did find a few mistakes a couple printed specs. You need the HP3 Manual in The Hi Perf section. I don't think the price is correct unless they are trying to get rid of them.
http://www.mercruiserparts.com/shopManuals.asp

Yellow_ICC_OK

Ordered today. Sounds like you've been through everything with this motor...might be hittin you up again for more questions!!!

Thanks!!!!!

Mike

Griff

I'm pretty familiar with it. I had one for 5 years and went through the top end it. It had over 500 hrs on the bottom and was still running strong when Dude sweet pulled it for some HUGE power.