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Ok , I have searched for all this on here but, I must suck at searching. I have a 11 rt 5.7 vvt non mds motor installing a 6.4 non mds motor cam . my question is this i bought a kit the guy told me he got from mmx attached will be the pictures of what i got . My question is do these parts look correct and my real concern is the valve springs hhp shows it takes 1515 springs not 1511 springs or am i misunderstanding what they are saying. Also i am looking for upgraded pushrods are manley 26640 pushrods correct. Thanks for any and all help this is my first build .
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The 1511 springs will work as long as you install them according to the instructions sheet you are showing. The 4683-16 spring seats are .205 thick and .031 shims to make up for the differences in the install spring height on the Eagle heads, and still give you enough spring for .600 to .625 lift. The installed height of the 1511 spring should come out to 1.800 give or take a few thousands. I've been running the 1511 springs on my 2012 5.7 since 2013, first with the 6.4 non MDS cam and the last two years with a custom ground cam, with no problems. The 1511 are with in a few pounds of spring rate of the 6.4 springs, so push rods are optional, 5.7 Eagles and 6.4 use the same push rod. The 5.7 has a higher spring rate then a 6.4.
 
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