Pushrod sizing for smith bros form - 4.0 V6 OHV

[OX644]

Hi there, Im building a 4.0 with the comp cam 422 and 988 springs

On the forums and the "building the OHV for power" post there is conflicting information about pushrod sizing

The stock Pushrod ballends are closer to 5/16 than 3/16, but why is it recommended to use 3/16? and what would the tube diameter be?

Isn't this the correct size for a engine without milling the head using stock rockers and lifters.

5.550 inch overall length
Straight wall
tube diameter: ???
5/16 ballend and not 3/16

Please correct me if Im wrong, I really just don't have to order twice.

The smithbros form is in attached files

 

[Angie]

hi, if memory is correct here... you can email them directly and ask them giving them all your specs. When i did a 410 cam i emailed them with what i needed and they supplied the information. it was years ago, however they should have a email contact us section. cheers

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[gaz]

@OX644 ,

Since you desire the correct length, I recommend using a pushrod measuring kit or simple have them build you adjustable pushrods for a couple dollars more;. This will guarantee the most accurate preload adjustments and afford you the ability to maintain it. Either way, the Smith Brothers can definitely help you with this ..)