If you like destruction -

[BossHogg69]

Originally Posted by James the III

What heads?? and did you use the correct locks and retainers..
I.E. 10 * retainers with 7* locks..
why it drop a valve??
or did it drop it from valve float.. or coil bind..

Heads are Edelbrock RPM Marine ovals as described in the previous posts. 10* Crower locks & retainers, #87055. Springs were Crower #68363. If if was the wrong retainers, I would think the whole valve (stem and all) would have been in the chamber, not just the head of the valve. Retainers were still intact as shown in the pics. I ordered everything from Crower after talking to them about what heads & cam I was running. Crower SS Enduro rockers. Pushrod length was measured during assembly and ordered accordingly. I'm very confident it was not coil bind, and unlikely that it was valve float, as I'd spun the motor up higher than the rpm that the valve failed and never gotten any indication of valve float. Not to mention both Crower and the guy that did the cam (Chris Straub @ Straub Technologies) said the springs were right for my the cam and set up accordingly. I think given where the valve broke, it was fatigue or maybe the seat wasn't perfect and caused it to fatigue somehow? I really don't have a 100% sure answer, as I am just a shadetree hack at best - which is why I posted everything up to get some opinions. The head itself and the valves were not new (they came off another engine), but all the other hardware was.

[BossHogg69]

On a lighter note, the 532 is finally finished and hit the dyno 2/10/16 (sheet attached). This is actually the second time it was dyno'd, as the first go around they experienced some issues with some guideplate/pushrod interference and had to pull the intake off the check it all out, as they initially thought it was a lifter issue. I must give credit Straub Tech/Foxwell Motorsports for making it right and getting this thing dialed in. For some reason, the dyno shop only had a 2" primary x 3" collector header available (WAY too small). With the 2" header, the peak numbers came to 785hp @ 6500 and 705#/ft @ 5100. Pull was from 4000-6500rpm, with the avg for both HP & TQ being 675. I am having headers built for the engine, (since I can't find off the shelf 2 1/8" headers for a C10) but the guy doing the headers here in Arkansas obviously needs the engine in the chassis to build the headers. That being said, I was not able to send the proper headers for the dyno test (it was dyno'd in Greenvile, TN). 2 1/8" primary x 3.5" (or even 2 1/4" x 4") would be considered the 'right' size for this engine/power level/rpm, and would almost definitely shown another 20-24 horsepower. Both the builder & dyno shop agreed power would be around 805-809 and about 300 rpm higher with a 2 1/8 or 2 1/4 primary.

There is an engine dyno local to me, and if he has a set of bigger headers there I may strap this thing down again before installing it in the truck. I most definitely will put it down on the chassis dyno to see where I'm at after the install. I'll keep you all posted.

[sprint_9]

Glad to see you have made it to the dyno.

I know you had mentioned earlier about your engine bay being just how you liked it, and I have to say it looks absolutely fantastic, hopefully everything falls back into place without issue.

[s_nova69]

I read this thread in the past and was pretty sad to see the carnage as I just built a 421 mouse for my longhorn and know the pains of trying to do all the right things and still getting derailed at most turns.

That being said CONGRATS!!!! on the 532. You will be much happier with it.

I am building a 72 swb super. I am going to build a 572 with the new magnum 300 heads. I will have a 4L80E to put in. It needs some work first though. Hoping for 700 WHP

I am interested to hear how the headers go as I will need some too. Also interested in what size exhaust u are running as well as routing

I wish I was closer to take a closer look.

Mine will have the no limit wide ride ifs and the trailing arm kit as well from them with coilivers and 14" wilwoods.

Are you planning on putting some tire under it to try to hook it up?

Good luck and maybe one day I can show you how to put a shift kit in that tko ����

[El Dorado Jim]

sub'd

[James the III]

I am wondering if your failure was from incorrect parts..
Edelbrook "marine" heads would not be set up for high rpm.. and fast rpm changes(shifts) as a marine engine is loaded and no transmission..
not many marine engines humming past 5000rpm.
The valves included would be more for long hour run time under high loads not, high rpm..

[BossHogg69]

Originally Posted by s_nova69

Are you planning on putting some tire under it to try to hook it up?

Good luck and maybe one day I can show you how to put a shift kit in that tko ����

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.

Originally Posted by James the III

I am wondering if your failure was from incorrect parts..
Edelbrook "marine" heads would not be set up for high rpm.. and fast rpm changes(shifts) as a marine engine is loaded and no transmission..
not many marine engines humming past 5000rpm.
The valves included would be more for long hour run time under high loads not, high rpm..

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.

[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..