bbundy

Intake cam. I think a cam cap broke first.

18psi

iTrader: (76)

wowza

psyber_0ptix

iTrader: (4)

Time for someone to build billet cam cap replacements.

bbundy

Interesting wear on the tops of the lifters. Only appears on #4 lifters. It's like pitting.

18psi

iTrader: (76)

was the car overrevved?

bbundy

I just bought all new bolts. journals all look good.

bbundy

It broke as the car was pulling through a finish at near the rev limit I have set. 8600 rpm.

18psi

iTrader: (76)

I have a theory why it broke

psyber_0ptix

iTrader: (4)

boop

bbundy

Im using Carrillo A-beam rods as well. small bolts. probably living dangerously.

EO2K

iTrader: (37)

Cripes Bob. Did you pull the head yet? What do the #4 valves look like?

thumpetto007

iTrader: (15)

holy ****. 8600rpm?

I can't even imagine the drivetrain vibration and noise at that rpm. It is almost unbearable in my (street) car at 7200rpm.

bbundy

Valves and cam journals and everything look perfect didnt pull it. I put a new cam and cam cap bolts in and it runs great again. The only lifter buckets that showed odd wear were the two on the #4 intake. they are on back order though. They were Supertech shim under bucket lifters quite a bit lighter weight than stock. springs are also Supertech the medium doubles.

the intake valves are also Supertech and I think they are ones made before supertech changed there manufacturing process because I have never expeianced seat wear with them that other people have.

I suspect one of the cam cap bolts on the back cam journal broke first and with the end of the cam not being suported it had some bending moment and the reverse bending cycles eventually killed it.

Stealth97

iTrader: (5)

I hope this never happens to me with my unobtanium cams...