Links and How To’s

Usefull information:

Calculate engine displacement

Calculate engine compression ratio

Calculate fuel injector duty cycle

Calculate fuel injector size needed based of HP

Calculate tire height vs rear end gears and MPH

Calculate 1/8 mile to 1/4 mile ET

Lots of good LT1/4 and GM Fbody information

LTX Tech your #1 forum for the LTX platform

 

 

How to:

Measure for the correct legnth pushrod

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The following is a method of verifying proper pushrod legnth and valve train geometry. After you have estimated the required pushrod length using a Pushrod Length Checker, use this method to verify that the valve train geometry is correct (using the rockers you are using in your engine).

 

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1. The first step is to install a solid lifter or light weight valve spring and adjustable pushrod. Mark the tip of the valve with a marker

 

 

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2. Install your rocker arm and set it up with zero lash.

 

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3. Rotate the crankshaft clockwise several times. Remove the rocker arm. The contact pattern of the rocker tip will be where the marker has been wiped away from the valve tip. The pattern should be centered on the valve tip, and as narrow as possible. If it is not, experiment with varying the pushrod length to yield the best pattern.

 

 

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4. Pushrod Too Long: Notice how the pattern is wide, and shifted to the exhaust side of the valve tip.

 

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5. Pushrod Too Short: Notice how the pattern is wide, and shifted to the intake side of the valve tip.

 

 

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6. Pushrod Length Correct: Notice how the pattern is narrow and is centered on the valve tip.

 

Set valve lash

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