Phil99vette

iTrader: (11)

We decided to retune our 00 automatic 346/ET 11 degree car this morning. We recently added LG pro long tubes and the car felt like it needed some more fuel and it sure did. The morning started fine, idle tuning went very very easy with the RTT tuning, took about 10 minutes to get the fuel dialed in @ idle. Inital driving impressions were correct, we had to add 3-7% fuel almost everywhere in part throttle, WOT was pretty close. The cruise was going great, did a pull to 6500 2nd and 3rd and the engine started tapping. The tapping was remenicent of 2 years ago when I floated the valves. Babied the car back to the house and used a makeshift stethoscope and found the noise was on the passenger side. Pulled the valve cover and found this....

ShevrolayZ28

iTrader: (4)

Yikes! Are you running a big cam with super-strong springs?

Raise

iTrader: (31)

seen plenty of stock rockers handle monster hp. not sure why that happened. that sucks man

98SS1LWEE

iTrader: (25)

Yeah, that' sucks. Let me know what setup you got, cause i jsut installed hardened pushrods and had no intentions on spending another four hundred or so for rockers, but if you're not running a huge cam, then i am scared not to get rockers. Also, stronger springs than 918's?

Phil99vette

iTrader: (11)

Comp Cams 238/244 XER
977 springs

PREDATOR-Z

That is unusual to break like that. Bearing spill is the regular culprit.

Grimes

iTrader: (3)

weird....casting flaw?

67Firebird455

iTrader: (27)

Yeah, or a good quality hardened pushrod (thickwall) that are too long, and a nicely tightened rocker would do that...

HottLS1Z

iTrader: (5)

I have a 98 with a stock valve train that I have the rev limiter set at 6550 it shifts at 6300....car has 129K on it never a problem with any rockers....thats wierd...my 00 shifts at 6800 with 918 springs and again stock rockers no problems yet.....knock on wood...

97MysticZ

iTrader: (16)

That is weird. At least you were smart about it and got it home and found the problem quickly.

spazzyfry123

iTrader: (4)

That really sucks man. Even though that is a good sized cam, I am still confused as to why it snapped? Never really seen that before.

Phil'sC5vette

iTrader: (4)

sorry about the rocker phil.

bad6as

iTrader: (17)

another reason aprox 85k

Mr. Luos

iTrader: (9)

Currently running stock rockers in my 402.
Spins to 6700.
Cam is a 248/254 629/622 113.

No problems. No noise, no bearings. They have 31K on them.
I will most likely have them re-built soon though.

Raise

iTrader: (31)

damn phil that sucks. is your geometry on point? heads milled/cam base circle size/pushrod length??

DocEwww

iTrader: (1)

Ive had good luck with mine also to 110K miles but I just picked up some Harland Sharps for insurance. Ive never seen them break like that tho.

spazzyfry123

iTrader: (4)

I can't even figure out what that is...

bad6as

iTrader: (17)

neeedel bearings total of 66 per rocker

i had 33 floating around and i dident know it till i went to change the oil

Louis

iTrader: (7)

We run stock rockers on the World Challenge car. 7400 every shift, 4000+ race miles, no issues.

Did I mention, there were a few 9200 and 9400 miss shifts in there as well? Just something that happens with race cars.

Ferocity02

iTrader: (60)

Two soup cans and a piece of string? We all have our homemade tools