E6te heads

What do I need to do to my e6te heads to run a 4x4 extreme comp cam. 34-239-4 ?  Lift  .554 /.574, duration @50 226/234, and lobe separation 111

racinghabbit wrote:What do I need to do to my e7te heads to run a 4x4 extreme comp cam. 34-239-4 ?  Lift  .554 /.574, duration @50 226/234, and lobe separation 111

NEED?
Cut the guide tops lower and etter valve springs ...

can i use stock rockers?

racinghabbit wrote:can i use stock rockers?

Yep ... with probably slightly longer pushrods; though they are not a part of the heads.

NEED?  
Cut the guide tops lower and etter valve springs  ...[/quote]

what do you mean ?

The pushrods will probably have to get longer because the cam has more lift than stock. The way it works is that the new and old cam both stop the lifter(reach max lift) and just about the same spot but the cam with more lift starts with the lifter lower in the bore. The base circle is ground smaller and it might be enough to use up all of your lifter preload and thus need a longer pushrod.

You might be able to get enough clearance by using a silicone rubber umbrella seal from a place like Engine Tech. They are thinner than the stock seals and that might get you enough clearance between the top of the guide and the bottom of the retainers. I think .050 would be plenty.

machine .050 off the tops of the valve guide for clearance? I just don't want to make a stupid mistake

I run comp 502-16 valve seals there unbrella

also I had a cam very close to this size with a set of C9VE heads and the positive valve seals did break.. would that be the same situation?

racinghabbit wrote:also I had a cam very close to this size with a set of C9VE heads and the positive valve seals did break.. would that be the same situation?

Yes. Over a certain amount of lift, factory parts start running into each other. A little trimming prevents this.

if I have arp studs, guide plates and full roller rockers on the c9 heads do I need to worry about the top of the guide still?

Also I tore down my c9ve heads last night and I Just want to be sure that cutting .050 off the guides is what I should do?

racinghabbit wrote:

Also I tore down my E6ve heads last night and I Just want to be sure that cutting .050 off the guides is what I should do?

Maybe ... might be a little less or more; remove whatever you need to remove in order to avoid interference when having THAT amount of valve lift.
Figure it out ... that's part of what working on a NON-stock engine is all about.