How much lift is too much?

Given the only consideration is valve to pistion clearance, the heads are shaved 0.055, and all else stock.

Thanks

 

Has a lot to do with duration also....not just lift alone.

 

has MORE to do with duration.
With the heads milled .055 I'd be checking anything over a 224ish duration myself <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

with .040 off my 232 cam needed .020 cut off the piston for the intakes to have adequte clearance

 

Thanks for the replies. I was not considering going over a 224 duration cam.

The largest cams on my list are:

221/221 .558/.558 114LSA LUNATI
or
224/224 .561/.561 114LSA Thunder


Fireball, would you be concerned about the Thunder cam?

Thanks

 

Obviously one point not addressed here is hydraulic or solid roller. Since more and more people (me too soon) are trying/using solid rollers, you can go a LOT bigger on the lift. For example, the new cam I will be using will have over 0.650 lift at greater than 255 duration.

Obviously, pump up issues on hydraulic rollers and longer required duration at .001 limit this a lot more. Also, as mentioned above, milling the heads always makes things fun.

 

I had an X1, which is pretty big in my car...no P to V clearance problems at all..

230/227 .591/.571 112lsa

I was told to go no bigger than this without fly cutting.. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

WeatherGuy, hydraulic lifers.

How high will stock lifters pump up?

 

I don't *think* the thunder should have any issues...but it would be best to consult with them on the phone before you buy it <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Zeta:
<strong> WeatherGuy, hydraulic lifers.

How high will stock lifters pump up? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Probably better to ask someone who has pushed the RPMs/lift/duration to the limits. The so called S1 cam 244/244 @0.050 with 0.610 lift has no problems to 7000. But milled heads can always change things a little.