71_firebird

I bought a used LS1 with 62K and I'm upgrading the heads and cam. Once I cleaned the pistons I can clearly see that the intake valves hit 6 of the pistons. This was not clear intil I cleaned the pistons so it must have been some time ago.

Can this happen if it was over revved on a stock motor? Or does it indicate there's and after market cam?

Lee

Tally TransAm

iTrader: (17)

over rev from a mis shift

been there done that

SOMbitch

iTrader: (8)

^^^^^^yep^^^^^^^^

studderin

iTrader: (28)

see it happen, the push rods didnt bend either

b00sted

iTrader: (7)

I've heard of it happening when tards go from 3rd to 2nd gear instead of 4th...Talk about being a savage.

jetlag

iTrader: (32)

In a Mustang GT I had awhile ago, I accidently went from 5th to 2nd..hah oops! But, I guess that's how you get a Mustang to spin tires on the interstate.

trigger1

iTrader: (28)

I guess that makes me a tard. I managed to go 3-2 when I first bought the car..I took out the stock camshaft, lifters, pushrods and managed to leave a few nice "valve reliefs".

71_firebird

That mark is way larger then what I saw on mine! Mine were just hints of a mark that was only exposed once I cleaned the carbon off. Did yours bend any valves?

Lee

chrs1313

iTrader: (24)

bend a valve...i would be suprised if the valve was in two pieces after that kind of hit

Tally TransAm

iTrader: (17)

tard here, did that about 6 years ago when i first got my car. took out a bunch of valves and pushrods.

short block has 80k on it since then with zero issues

LS1MCSS

iTrader: (18)

Here is what mine looked like when I tore it down.

Halloran

iTrader: (7)

Been there done that...mine was from a 5th to 2nd shift...whoops lol

Kalgorn

iTrader: (6)

*raises tard hand*

Did the 3rd to 2nd. Luckily, I wasn't racing or anything. I was just goofing around on a highway and wasn't far enough into 3rd to make 2nd redline.

71_firebird

Good heavens! I didnt know it was so common! I wonder if the previous owner had to replace anything. It surely was not as severe as the pictures here....

Lee

StylinZ

Just tore mine down last week and saw i had it on 4 pistons!

Beaflag VonRathburg

iTrader: (176)

The way you have to shift on these cars blows ***. You have four gears on the top and three on the bottom. The shifter is tall and thin. Who the **** thought of that? I have a B&M ripper in my Formula and it still took me forever to get used to it.

The Alchemist

iTrader: (19)

It doesn't only happen from misshifts, it can happen if you have weakened springs and spin the motor high enough to get valve float. The cam lobe comes down quick enough at high rpms that if the valve spring isn't strong enough, the valve actually lags behind and the piston is nice enough to help close the valve, hence, the nice little eyebrowe without bending anything. This is usually the case when guys raise the limiters in the cars to above 6500 without changing springs.

Kalgorn

iTrader: (6)

But Reverse should never have an affect on your shifting since it gets blocked once you start moving. You can cram that shifter as far right as you want while you're moving and you're not going to get into Reverse unless you break something.

trigger1

iTrader: (28)

Yes, I took out the camshaft, lifters, pushrods and a couple valves with that misshift.

Beaflag VonRathburg

iTrader: (176)

I know, but it's still there. They should have made the shifter short and wide instead of tall and thin. The way it is now the distance between shifts are long and hard to get into because there's not much separating the gears from each other.