Ive done so many modifications to my car.....

[Markgase2000]

the dohc 3.4 was a nightmare for tecs to work on , people werent up to par with maintenance. It had lots of jam but is not as reliable as the new 12valve 3400 , the new 3400 is capable of some good hp and can be driven hard all day long. I drove mine 1500 kms in a day and a half and i drove hard the whole time. I got over 130,000 miles on this engine and alls it knows is go go go! Plus it runs better than the day i bought it. All i do for maintenance is clean (top to bottom) the engine and tranny , oil changes every 2000 miles , engine still doesnt burn oil , Still has original tranny fluid , never been serviced other than to check fluid levels(no tranny dipstick) , its a good car as far as im concerned , easy as hell to maintain.

[Markgase2000]

it wasnt that hard to change the plugs on the dohc either , you just loosen a couple of engine mount bolts when the car is lifted in the front and lower it onto a block of wood so it tilts forward and whallah the plugs are in view.

[shark2000]

Originally Posted by urweak

no gm doesnt call it TDC, you made that up.

This article mentions the TDC (Twin Dual Cam)

http://www.3400swap.com/gto.html

So now you can officially stick your foot in your mouth. Let us know how it tastes.