Re: 260 Merc 5.7 rebuild
Ok for the people wondering. I started off with a set of 906 Vortecs from a 1998 2500HD Pickup. $125.00 First thing I did was removed the pressed in studs utilizing Summit Racings "Rocker Arm Stud Removal tool" (PN SUM-900136) $14.95. I then used the tool again to line everything up and tapped them. Since I was not using guideplates and I was going to run self aligning rockers, you have to use Mr. Gaskets Collerless studs. (MRG-1076) $31.88. Thats it for converting to screw in studs (Othe rthen screwing them in with sealer) You have to drill out the pushrod holes in the heads with a 1/2 drill bit also if you want to use 1.6 Rockers. As for the valve springs, I went with good stuff as I dont want anything letting loose at the RPM's I run, + its always a little better running higher spring rates with a HIPO Hyd roller cam. For springs I used all Comp hardware. Springs were LS1 style beehive springs CCA-26918-16 $174.95 , Machined Locks (Not stamped)CCA-648-16 $22.25 and special Beehive retainers so they can be used with stock size Gen 1 valve stem. CCA-787-16 $49.25. So for 420 bucks I have a great set of heads that'll be able to take 550 and under roller camshafts and take the abuse of a marine engines. Heres pics to follow.
