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Push Rod Length for 383 Stroker...Help!!

This is a discussion on Push Rod Length for 383 Stroker...Help!! within the Internal Engine forums, part of the LSx Technical Help Section category; Just got my 383 running and after 90 miles of break in I had about 4 push rods bend.. Talked ...

  1. #1
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    1998 Trans Am

    Exclamation Push Rod Length for 383 Stroker...Help!!

    Just got my 383 running and after 90 miles of break in I had about 4 push rods bend.. Talked to the guy that built my motor and he gave me the wrong size.( stock Ls1 7.400). I checked the gap under one of the good pushrods rocker arms to the top of a released vavle and it was not even .010 and the guy said it needed to be between .040 and .065. What pushrod do I need to go with to solve the issue..? 7.325 or 7.50? I can do the math but was going to see what others thought.

    98 Trans Am
    383 Stroker-Eagle Crank, Pistons, Custom Ground Cam, Z06 valve springs
    6-speed

  2. #2
    Veteran Hi-Po's Avatar
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    off hand i dont know. you can buy/borrow/ rent an adjustable length pushrod and find out pretty easy.

  3. #3
    Slow'er'Ass Mr. Luos's Avatar
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    2008 Trailblazer SS

    You used stock pushrods? Not hardened ones??
    What valvesprings?

    What heads? What cam? Heads milled?? What lifters?
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
    Lowered, HID's, tinted.

    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

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    Veteran Hi-Po's Avatar
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    oh no... gotta get get some good chrome molly hardened pushrods or something.

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    Mag Red
    2002 Vette

    Are you running solids or hydraulics? It sounds like you are measuring clearance between the rocker tip and the valve stem like a solid roller setup.

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    Nitrous Tuner LS2Tuner's Avatar
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    At least a 0.80" WALL

    You need to get a adj. pushrod to figure out what length you really need!!!!!
    You have to spin the motor over and watch what the rocker is doing compared to he valve tip.....You don't want it to walk all the way off the edge and you don't want it to start on the edge.......
    NO ONE WILL BE ABLE TO TELL YOU WITH OUT DOING THIS!!!!
    EVERY MOTOR IS DIFFERENT....HEAD GASKET THICKNESS,HEAD MILLING,AND CAM WEAR ALL EFFECT CORRECT LENGTH.

    I ALWAYS RUN SMITH BROTHERS.....AWSOME PRODUCT AND SAME DAY TURN AROUND!!!
    Hope I helped.
    Last edited by mrr23; 11-03-2006 at 07:47 PM.
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

  7. #7
    Veteran Hi-Po's Avatar
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    Quote Originally Posted by LS2Tuner View Post
    You need to get a adj. pushrod to figure out what length you really need!!!!!
    You have to spin the motor over and watch what the rocker is doing compared to he valve tip.....You don't want it to walk all the way off the edge and you don't want it to start on the edge.......
    NO ONE WILL BE ABLE TO TELL YOU WITH OUT DOING THIS!!!!

    EVERY MOTOR IS DIFFERENT....HEAD GASKET THICKNESS,HEAD MILLING,AND CAM WEAR ALL EFFECT CORRECT LENGTH.

    I ALWAYS RUN SMITH BROTHERS.....AWSOME PRODUCT AND SAME DAY TURN AROUND!!!
    Hope I helped.
    Listen.
    Last edited by mrr23; 11-03-2006 at 07:47 PM.

  8. #8
    Nitrous Tuner LS2Tuner's Avatar
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    O'h Whatta.....

    Quote Originally Posted by Hi-Po View Post
    Listen.
    Couldn't hear you........

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