If you like destruction -

[James the III]

Originally Posted by BossHogg69

It already has some tire under it, 345/30/19 on 12" wide wheel. I'm fairly certain that 705#ft will rape any street tire. I have another set of 18x12's that may get a 345 MT drag radial if I ever go to a dragstrip. My 'shift kit' is a full workover by Libery Gears and a RAM 10.5" dual disc clutch I like my hotrods with 3 pedals.



The Edelbrock Marine heads come with a black anodized coating and the only difference in valves are the addition of Inconel exhaust valves, and no valve springs/retainers come on the heads from edelbrock. Other than that they are exactly the same as the Performer RPM/GM ZZ big block heads as far as I know. Of course I could be wrong. I had already made the decision to get the head fixed for use in another project and I'll be replacing all the valves at that time. I had the heads checked out and put on a flowbench before I ran them on the 454, but obviously that didn't matter.

Maybe.. I'd have to call them.
but I'd hope a car set would have 1 piece intake valves.. if not all, the ones for roller cams.
Marine use a 2 piece valve would be no issue.. as it be lumbering along at 3000-4500 rpm.. set rpm.. or less..
Did you check the spring pressure after tear down . seat and open to see if at it's installed height( in head as used)it was within spec for that cam??
I.E. did it float the valve.

[BossHogg69]

Originally Posted by James the III

Maybe.. I'd have to call them.
but I'd hope a car set would have 1 piece intake valves.. if not all, the ones for roller cams.
Marine use a 2 piece valve would be no issue.. as it be lumbering along at 3000-4500 rpm.. set rpm.. or less..
Did you check the spring pressure after tear down . seat and open to see if at it's installed height( in head as used)it was within spec for that cam??
I.E. did it float the valve.

I haven't checked the spring pressure, they're still on the heads. I gave the spec sheet to the shop that set up the heads, and I didn't check them myself after he set them up.

http://www.edelbrock.com/automotive/...m-marine.shtml

They recommend use of Performer RPM cam, hyd roller & Performer RPMintake, those are all spec'd for 6500rpm operation, per Edelbrock. Don't know why they would include valves that wouldn't be good for the same RPM.

[James the III]

Originally Posted by BossHogg69

I haven't checked the spring pressure, they're still on the heads. I gave the spec sheet to the shop that set up the heads, and I didn't check them myself after he set them up.

.

Not asking if the springs where set up correctly..
I'd like to know if the spring is NOW at the correct spring height and if the on seat and open pressures are still in spec.. As this will tell you if the spring lost strength and allowed the valve to float..
if many of the springs installed height is wrong.. you'll see that now.. but I'd want to measure more than just one for this. as the fails spring if it weakened will most likely be shorter now than when installed..