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As DionR said, the Eagle heads have a .040 steal spring seat under the spring( but no shims under that). The spring seat must be reused between the aluminum head and valve spring with the new 68277306AA spring, plus the original retainers and locks.

RSM, If you are not going to use the factory ECM and use a carbureted intake with a throttle body injector and some other means of running the ignition and timing. Then the 6.4 cam is the wrong one for for what you are doing, the 6.4 cam makes its best power when set up with its full timing...

I have not changed the push rods in my 5.7 for ether cam change, my resigning for this is the stock factory valve springs for the 5.7 Eagle have over 400 pounds per inch of spring pressure. The stock 6.4 along with the Mopar performance and the PSI 1511ml springs that I used all have spring...

Okay, I will try and answer your questions in order. I have changed cams in my 5.7 Eagle 2012 R/T Classic 6 spd. twice now, the first time to the 392(6.4) non MDS cam and the second to a larger custom cam for more power. The 392 cam was the better all around cam, the custom cam was good for more...

All 5.7 from 09 to present are designated Eagle engines and 6.4 are Apache in cars and Jeeps and BGE(or big gas engines) in trucks are VVT engines. The heads on these engines along with the 6.1SRT all have ruffly the same intake ports and the intake manifolds will all bolt up. The 03 to 08 5.7...

Its already been proven that the 6.4 cam in a 5.7 makes more power if you leave the full VVT cam timing curve in it. If you lock it out or use a limiter there is a substantial power lose. Just need a new tune that adjust the cam timing a few degrees to step up the low and mid range torque.

Took the hose and spark plug end off an old compression tester and put a male end on it so I could plug it into my air compressor hose and turned the regulator down to around 70 to 80 pounds if I remember right.

I used the one from Crane cams, it was the list expensive one for doing the springs with the heads still on the engine.

I am assuming the MP springs would be set to the stock height(1.99 Inches installed height)on the 5.7 Eagle heads and need to be shimmed for the 6.4 Apache head(2.051 inches installed height) to put them back to the 5.7 installed height of 1.99 inches. Yes use the factory shims, retainers, and...

It is not very easy to come up with spec for Mopar Performance parts for gen 3 Hemi's. But that being said, the springs are the ones that come in the stage 2 scat pack kit with the Comp 270 cam(spec's, Comp 201-426-17 270/283 advertise 222/[email protected] .615/.609 lift lsa 115*) this is a larger cam...

That is why I used the PSI 1511 springs, they are good for up to .625 lift and have enough spring tension for most of the after market shelf cams made for the 5.7 and 6.4 VVT Hemis. I put a 6.4 cam in my 2012 Challenger R/T in 2014 with these valve springs and than in 2019 I put in a custom...

I have seen dyno pulls other guys on the internet with this cam an similar mods pull 60 hp or more at the rear wheels.

Okay you have the MDS auto cam, all you need to do is change valve springs. Easy to do with engine out of car, intake are easy and exhaust are a little tougher with the engine in the car. Be very careful when reinstalling the push rods if the engine is in the car(hard to see the right holes in...

Ronald C. The 6.4 works great in the 5.7, the best cam to use is the one for the 6 spd Manual trans(non MDS cam) part# 05037379BC. The cam smooths out the power curve of the 5.7 Eagle and really pulls hard from 3000 to past 6000 RPM's. If your engine came out of a manual 6 spd car all you have...