cam choices

[alvarez1112]

I have a 3.4 that Im swapping the 3400 top end to and I want to which cams can be used with the stock 00' + 3400 valve springs, or do I need to upgrade the springs no matter what?

[SappySE107]

You should upgrade the springs. The flat tappet cams call for some pretty stiff springs if I remember correctly. That is, any cam worth installing anyway. I take it this is an iron head engine you are putting the aluminum heads and intakes on? Any other mods to the motor?

[alvarez1112]

yep iron head to alum and intake... all the FI stuff as well. Getting run via megasquirt and either boosting it or sprayin a little, so I should probably upgrade anyways.... I understand the 34oo has roller rockers, any idea as to which push rod should be used to retain factory rollers?

[SappySE107]

You will need custom pushrods for this setup.

[geoffinbc]

Crane and Comp sell straight springs for the 660 but I would rather use the beehive springs. They are a much better spring. Use LS6 springs or the Comp springs.