Hey Guys I Have 2 Gen Iv Bowtie Blocks Bored Out To 4.530,was Trying To Get A Idea Of What They Would Be Worth.

800-1200 each if in good shape !

Have they been run with raw water in them ?

Yes, They Have Been Ran In Raw Water,but Have Had No Problems With Them.

I believe they were available in siamese and non siamese. Check which you have.

They Are Siamesed Cylinders,according To The Gm Performance Book They Can Still Be Bored Another 30 And Be Safe Within Their Specs Of Bore Range,and I Need To Correct My Self On The Raw Water Issue,they Are Raw Water Cooled But Mainley Fresh Water And Some Brakish,as Far As Them Making Both All My Reserch Shows That Both The Bowtie Blocks Offered At That Time In A Mark Iv Block Tall Deck And Short Deck Were Siamesed