I_eight_riceburners

I have a 1999 Camaro LS1 and I had both the heads on my car replaced with heads from a 1998 LS1. The casting number is 339K. The heads have new OEM valves and springs. I had brand new 7.400" push-rods in the motor, and valves were staying open when they should have been closed. The push rods worked fine in the heads I had replaced. What length push-rods do I need? The heads were shaved down, but did the 1998 heads have different push-rods? I need to order the right length, please HELP!

Specs on hardware:
2.00/1.550 valves, 130lbs at 1.800", 314lbs at 1.200", 65cc combustion chambers, GM blue springs

crainholio

iTrader: (2)

You need to either tell us exactly how much the heads were milled, or (gasp!!) spend $20 on a Comp length measurement tool and (gasp!!!!) take a measurement on your setup.

vettenuts

iTrader: (4)

As stated above, you should measure.

However, as a quick check, put the motor at TDC for #1 and back off on the rocker bolt then tighten until zero lash. Once as zero lash, count turns to 22 lb-ft. This will at least give you an idea of how far off your are.

94mustang

iTrader: (1)

I see this way too much. Measuring is key when putting an engine together, no matter what it is. Not something to skip out on.

2000ws6transam

iTrader: (5)

how can u tell when your at TDC???

I_eight_riceburners

I cant visually tell exactly when the motor is at TDC, but I was able to see that number 1: no compression was present in any cylinder, 2: when the intake valve was open the exhaust valve wasn't 100% closed.

2000ws6transam

iTrader: (5)

i turned the motor over by hand till the intake valve closed all the way and before the intake looked like it was moving i think that should work? that should be TDC on compression/power stroke i think..never went to school for this stuff just a shade tree guy ;p

vettenuts

iTrader: (4)

After the intake closes, its about 1/3 turn to TDC. You can use a straw to feel for the piston. Other option is to wait until exhaust is opening then measure intake.