My guess is, if the guides had a lot of wear then the valve doesn`t land squarely on the seat so it will need to be reseated. Also if the valves were mixed up and not bagged in the order they came out then you have to reseat them.
IMO, you need the valves/seats done any time you reline the guides.boggla500 said:Ok I have a pontaic 455 heads 6x the machine shop says I need to reseat the valves with new guides
OK, then how does your mentor plan on doing things? Tell me he's gonna lap them in.are they trying to take advantage. My machanic mentor says it bs.
The valve seats are machined with reference to the guide. Typical guide repairs don't take into consideration the location nor angle the original guide had with the seat. The typical guide repair starts with the guide in what-ever shape its in and either:boggla500 said:Ok I have a pontaic 455 heads 6x the machine shop says I need to reseat the valves with new guides I never heard of this but I don't know every thing and wondering how true is this or are they trying to take advantage. My machanic mentor says it bs. The bill to due this is enough to buy used bare pontaic aluminum heads soooo Iam not realy buying it. Oh and its Car Quest. any help would be great!
How did that affect the guides?boggla500 said:thanx for the help. I will keep it all in mind the reason for junk valve guides is due to house fire and water and sitting not because of a problem in the motor. Yes foke its been checked for cracks and the works no problem there they weren't in the brunt of the fire any way soo It didn't effect it any besides the guides.