Willem @ Fuel Injection Concepts

iTrader: (2)

Does anyone have a part number for these, where to order them and any idea how big the flow difference is? Are they even a different head or do they just have better valve springs.

Willem @ Fuel Injection Concepts

iTrader: (2)

bizzump... surprised no one's discussing these on here lately. Anyone know the exact differences woul be great too.. if I'm on a wild goose chase for a pair of heads that just come with beefier valve springs oEM then obviously forget about it. 'ine the contrary, if ithey do have better flow/etc like claimed I will still continue my desperate search; just don't even know where to start first with Marine parts. Who even makes the "marine stuff{, is it Mercruiser?

The sad part is doing a search I see threads from a while back here where 8.1 dudes talk about ebay sources that existed for the 8100 HP3 heads. :crying:


thanks in advance to anyone with help!

TieRod

They where just stock ported heads.

Manic Mechanic

iTrader: (3)

I have a set that I got on Ebay. They are CNC ported and the chambers are CNCed. The rocker stud bores are standard instead of metric. I believe the springs are stiffer but I haven't taken them off to check yet.

I think GM or Mercruiser has discontinued them. The guy on Ebay has tried to sell another set a few times that I know of. He's TopGearOK or similar. You have to search in the boat engine sections to find them.

Vernon

Manic Mechanic

iTrader: (3)

Also I've thought of have them mapped on a CNC mill to repoduce them but haven't seen the market to justify the costs. I'll be installing them this spring so if interested speak up.

Vernon