Seals?
You DO Realize that You can CHANGE the Seals w/Out Pulling the Heads off!If its a SBC,and the Heads had a O-Ring type of Seal?Go down to the Local Auto/Machine Shop.Tell the Machinist you Need a set of UMBRELLA Seals for a SBC.They can be Changed with a Moroso Valve Spring Tool 1 @ a Time.And thats a hole Lot easier than Pulling the Heads!
Truthfully,I think the Guides would have to be REAL Bad for this Problem to Happen???
Later
G 8)