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Old 07-15-2009, 05:37 PM   #1
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Question what size pushrods are everyone using with gt40 heads?

like the title says i think i may of used the wrong size creating problems, like maybe a vacuum issue?
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Old 07-15-2009, 05:48 PM   #2
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I'd suggest getting a pushrod length checker, so you can get the right size without guessing. A good valvetrain makes or breaks a motor.
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Old 07-15-2009, 06:06 PM   #3
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I understand that, they were checked but I'm trying to find something out.
with the example of a stock 93 cobra with gt40 heads, what length pushrods are stock?
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Old 07-15-2009, 07:44 PM   #4
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I believe 6.250" is with a totally stock block, stock Cobra cam, 1.7 Crane/Cobra rocker arms, stock head gaskets and GT-40 heads. Change anything and it's time to measure.
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Old 07-15-2009, 08:06 PM   #5
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So what size did you use?
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Old 07-15-2009, 10:01 PM   #6
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With pedestal rockers its pretty easy to know if your using the correct length or not. Put the rocker on the #1, ensure both valves are closed, get to zero lash and then see how many turns it takes to get to 18-20 ft#'s. You are looking for 1/4 to 1 turn. Ideally 1/2 -3/4 turn.

Anymore more or less and you need to then measure.
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Old 07-15-2009, 10:20 PM   #7
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6.272 is factory...
I used factory pushrods with my tfs stage one cam.
hope you solve your problem
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Old 07-15-2009, 10:22 PM   #8
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i used 6.25
thanks for the help
im just trying to narrow down the problems
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Old 07-15-2009, 10:45 PM   #9
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but when you ask about pushrod lengths needed...when you ask,
all that you are doing is getting answers from others.. every setup is different and even the same parts will need a different length.

you are still just guessing if you do not actually use an adjustable pushrod to see what is needed.
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I have gone down the road that you are only now about to travel.
tires are the great equalizer
a degree wheel, EIGHT INCH dial caliper & adjustable pushrods should be just as normal as a 1/2" wrench in your toolbox
there aint no shortcuts to doing it RIGHT....
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Old 07-16-2009, 05:40 PM   #10
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I used Trick Flow 6.300" with mine. Nothing but the block and lifters are stock though. Shaved P heads, B cam, Manley valves.
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Old 07-16-2009, 10:13 PM   #11
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Quote:
Originally Posted by Trey LePark View Post
I believe 6.250" is with a totally stock block, stock Cobra cam, 1.7 Crane/Cobra rocker arms, stock head gaskets and GT-40 heads. Change anything and it's time to measure.


this was the answer I was looking for and actually what I thought it was also. However, it was done at a shop and they took a different measurement and I need reassuring that his measurement was correct.


It's my sons' car btw
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Old 07-17-2009, 12:54 AM   #12
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there is no way to know if it is right or wrong untill you actually measure it with an adjustable pushrod.


reality is....most shops do not know how to do it right!!!!!!!!
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I have gone down the road that you are only now about to travel.
tires are the great equalizer
a degree wheel, EIGHT INCH dial caliper & adjustable pushrods should be just as normal as a 1/2" wrench in your toolbox
there aint no shortcuts to doing it RIGHT....
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Old 07-17-2009, 06:45 PM   #13
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thanx Kato, I was actually wanting a comparison as I feel the guy measured wrong.
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Old 07-17-2009, 07:12 PM   #14
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Kato, they continue to ignore the words of wisdom, they are afraid to walk into the light, until then they will not be able to snatch the lifter from the master's hand !
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Old 07-17-2009, 08:00 PM   #15
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God forbid you use the stock pushrods and don't try to be a hero. Its been done a BILLION times.
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Old 07-17-2009, 09:11 PM   #16
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I was trying to throw a lighthearted reply on the subject, thought someone would get bumpy over it. But facts are with 3 different gt-40 castings, headgasket differences, rockers, etc..., why go that far and not measure yourself ? Mine with a xe270hr, scorpion rockers, etc.., measured to need 6.300 pushrods. I would have loved to not spend anymore money but measuring is doing the best you can and not a hero thing, and I'm not a engine wizard by any stretch of the imagination.
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Old 07-17-2009, 11:53 PM   #17
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Quote:
Originally Posted by Harrythegreek View Post
I was trying to throw a lighthearted reply on the subject, thought someone would get bumpy over it. But facts are with 3 different gt-40 castings, headgasket differences, rockers, etc..., why go that far and not measure yourself ? Mine with a xe270hr, scorpion rockers, etc.., measured to need 6.300 pushrods. I would have loved to not spend anymore money but measuring is doing the best you can and not a hero thing, and I'm not a engine wizard by any stretch of the imagination.


just measured mine for my new car and I got 6.296
cant wait to get them in and get rid of my TICK!
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Old 07-18-2009, 04:35 PM   #18
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not a debate for you guys, just trying to get a size for a comparison.
they were measured and I feel the car does not make the power it should. I actually think it runs a little suspect, like a vacuum leak, and the first thing I thought of was incorrect length pushrods.
When I was told the measurement I questioned it as every time I've used GT40's I've used stock with no problem (6.25) Was basicly getting opinions as I want to remeasure the push rods, I don't trust the measurement.
thanks, no further replys' needed.
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