Im looking at some used aluminum heads that say "mercury" on them. From a 700SCI Motor. Who makes those ? I am wondering what they are? Obviously they make 700 HP with a blower. Any Clues?

edelbrock

Yup.

Be careful, they (525efi and 700sci) have a different to them exhaust bolt pattern than all other bbc heads.

You can buy the 525 edelbrock head at summit racing

Thats interesting. How did you figure that one out? so Auto headers wont fit?

which can be fixed very easily w/ a drill and tap

put the exhaust gaskets together.they had different p/n's

Yup. :thumbs

By some, but many others schit themselves with the thought. Some have trouble diagnosing their lanyard has been pulled. I can’t answer for many but i can point it out

I lose at least 20 minutes of trouble shooting time each season from not immediately checking the lanyards.

do you know any more? rectangle I assume.