Jesus talk about conflicting lol. God help me.

If they were replaced it was 40 hours ago. Looks harsh for 40 hours.

For starters get inland and off the salt water. Soon! 40hrs??? You sure? Same head guy...

We run thru CT river which is fresh water to salt and then back thru fresh On way home. Yes I am sure. Original top ends were done with 300 hours. Motors now read 340. The heads were originally done by precision machine in mass.

K. I only asked cause there are a some not so honest shops and just wanted to confirm. Even on street vehicles now a days that I rarely get under the hood or underneith I've learned to use a little fingernail polish on an edge or two of some bolts/nuts. Amazing how I've busted some reputable shops who supposedly changed differential fluid, transmision repairs, (Lucas) ha, and on and on.

They think there out smarting a business man but neglect to notice the callused hands and dirty fingernails. Lol

Quick update...first motor complete and back together. Ended up replacing guides. Cleaning up the heads, valve job, dropped oil pan inspected bottom end, new gaskets, and new valves.

As for the second engine, builder is recommending to buy new heads. So the question is what set of heads to buy. He mentioned aftermarket heads requiring smaller valve stem diameters. So I would need new valves on top of new heads. Anything out there that is factory replacement that won't change this? He also mentioned heads changing height for exhaust. All of it has me nervous. Any suggestions?

Thanks

If one motor is good just pick up factory heads for the other. Likely 088 heads and there are plenty for sale all over.

Also start flushing your motors with salt away. You shouldn't have ruined a head in 300 hours. We run in the gulf and don't ruin em that fast.

They aren't completely rotted but enough that he doesn't want me doing this again in 5 years. We run in fresh water river after ocean running. So not sure what the issue is.

Where should I look for factory heads? That will fit 500efi

Probably Jegs or Summit

140970088 / 14096802 Service replacement head for the Gen V block

12562925 / 12562934 Service replacement head for Gen V / VI block with 7/16 accessory holes

12562926 / 12562934 Service replacement head for Gen V / VI block with 3/8 accessory holes

Thanks griff. Do you happen to know if they are true factory replacements. Or will I have to compete with valve guide areas being different? I don't want bastardized motors and would like to keep everything common amongst motors.