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Just follow the directions that come with them and you will be fine, no need to piss your hard earned $$ away to have them checked. They run fine outta the box!



Yes they do... I clearanced the push rods myself, checked to make sure all was seated properly, springs were symmetrical, keepers and locks were on properly, and bolted them up. They work fantastically right out of the box. As mentioned, save your bucks on having your machinist look at them. That is of course unless you are building a race motor then by all means as the tolerances are much more finite. By the way, here is how a 383 sounds with the 440 Source Heads on my 1966 Plymouth Satellite that I just got up and running...

https://www.youtube.com/watch?v=AAs5NqGnUTw

Enjoy....