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Factory 6.1 Valve Spring Specs

Success...got the info from another site - FWIW, the ID of the bottom end is .81 and the OD is .125

 

This makes the PAC 1535 suitable for use - using appropriate shimming.  :D

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Thx for chiming in Erik.......Why cant we use the factory cages as locators....if the inner diameter is the same as the factory spring?

You can if it fits. Also make sure spring is installed at 1.800".

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OK....so walk me through this...if the OD and ID are the same as the factory spring....why are locaters needed?

 

The factory ones should work...yes?

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OK....so walk me through this...if the OD and ID are the same as the factory spring....why are locaters needed?

 

The factory ones should work...yes?

If the spring fits inside the cage and is located well, use them. They will still need shims on intake more than likely.

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Ok thx - I think the confusion is because the 1518 has a larger ID and would require a locater - this seems to be the one a lot of guys use.

 

The 1535 is more of a direct replacement - but isnt as well known.....maybe its new on the market?

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