what is the largest you can cut an lt4 heads' valve spring seats out to?

 

anyone..

 

I don't know off the top of my head - you can definitely fit a 1.460" dual spring which should cover pretty much any street cam.

 

mine are over 1.5 I know that, one problem is tho once you go so big you need to clearance the washers for the head studs to clear them like i have to. and sockets get tight on the head bolts/studs.

 

I have 1.625" O.D. springs on my heads. When you cut the seats, be sure to just go wider instead of wider plus deeper. It requires some imagination in working with the stud/bolt washers and a careful selection of sockets to secure the heads. The O.D. will need to be reduced. I use a Snapon, 12 point, medium length, 7/16" x 3/8" drive socket. It has very thin socket walls and is strong enough to take the stress of the torquing process. Cheaper sockets have thicker walls. This is one time when there are few viable alternatives to buying Snapon.

 

How much lift is your cam running? Another option is if your cam is lower then .650, you can consider running the PAC 1518 beehive style springs so you don't have to cut the valve spring seats.

 

well i got some crane 10308's(1.46 i think) and a comp xfi 280.. they will fit fine on lt1 heads but since lt4 have a taller port they have more material around the seat. i can't find a 1.480 cutter(the width of the shims). i think the smallest was a 1.55.. i just ended up taking them to a machine shop this morning so its their problem.