On my 5.3L heads, I had em milled .010

Dished exhaust valves were used, and the combustion chamber is between 60cc & 61cc's.

So how do I figure my CR?

 

with a stock gasket, a volume of 60.5 cc and a stock flat top piston on a stock bore with a stock stroke i am coming upo with 10.924

steve frank

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by steve:
<strong>with a stock gasket, a volume of 60.5 cc and a stock flat top piston on a stock bore with a stock stroke i am coming upo with 10.924

steve frank</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thanks Steve!!! I'm hoping that'll be OK with 91 Octane...damn AZ gas <img border="0" alt="[fight]" title="" src="graemlins/gr_punch.gif" /> <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />

We'll find out!!! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

I get 10.96:1 with a 60.5 cc chamber.

Eric <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

what about .050 on stock 5.7 heads <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

hey verbs, you thought you have detonation problems before!
do the free ram air and use two 10" pushers to help things in the cooling dept.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 1dirtyZ:
<strong>hey verbs, you thought you have detonation problems before!
do the free ram air and use two 10" pushers to help things in the cooling dept.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I'm going to be using LS1 edit to turn my hi speed fans on at all times pretty much. If that doesn't work the FTRA is getting sent to the scrap yard.

I think I've cornered my detonation issues. My car had a TSB for bad knock sensors that have been known to give bad readings and cause detonation. I just got those fixed, and will also be keeping the car cooler with cooling fan adjustments.

If that doesn't work I'm just gonna buy a Ford <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.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 DriveATransAm:
<strong>what about .050 on stock 5.7 heads <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Stock 5.7L heads are 67.3cc, milling 0.050" will drop them to 62.3cc, for a compression level of 11.1:1 on a stock displacement motor <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />