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Unread 06-08-2013   #1 (permalink)
Happytrack 44 is offline PONY Member


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Default Pushrod length for GT40 heads.

I'm building an 85 roller block for my 89 lx.
I have an E303 cam, 3 bar GT40 heads, and will square the block and heads.
Will the stock length pusrods be right for this using either stock rockers or 1.6 aftermarket rockers?
Thanks, Rob
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Unread 06-08-2013   #2 (permalink)
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You will have to measure push rod length, so get yourself a push rod checker and upgrade the springs on the heads and get harden pushrods. Stock length worked for me with that set up, but when I swtched to 1.7 rockers I had to get longer push rods
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Unread 06-08-2013   #3 (permalink)
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Agreed upgrade to 1.7 rockers. Thats what originally came on the 93 cobra with gt40s


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Unread 12-27-2013   #4 (permalink)
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I know guys who ran that same set up with stock valve springs and stock pushrod length. They had no issues with clearence. But if you can check to double check. good luck with your build
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Unread 12-28-2013   #5 (permalink)
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E303 is a decent mild cam and guys have used stock pushrods with it. What is the casting number on those gt40's?(on the underside that bolts to the block...f1ze, f2ze or f3ze? There are different 3 bar gt40's. Also are there rockers still on the heads?
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Unread 01-01-2014   #6 (permalink)
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I used stock ones both with stock rockers and 1.7 rr

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Unread 01-01-2014   #7 (permalink)
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Quote:
Originally Posted by Lt mac View Post
You will have to measure push rod length, so get yourself a push rod checker.....

Agreed. The stock pushrods might physically work, but the length may not be optimal. It's worth the time to buy a pushrod checker and make sure you get it right.
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Unread 01-01-2014   #8 (permalink)
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Well youll know when u torque them..if they dont tighten within spec..follow the half turn rule

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