if you mill the head it will fix the compression problem, this still make no sence to me.
thunder racing sells heads that are cnc'd by several different people..
if you mill the head it will fix the compression problem, this still make no sence to me.
thunder racing sells heads that are cnc'd by several different people..
s10 with 4l60e and cammed 5.3 on the road!THREAD
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf.".
Originally Posted by Lsx10
* a guy named Allen.. Good friends with him.. He did the CNC on the heads I bought from Chevrolet. He works at thunder racing. They do all the "in house" stuff now.
No I didn't get the heads milled..
I don't understand what you don't get honestly..
Either W4M didn't compensate for the tune with the heads I used. Or I was supposed to upgrade fuel injectors to compensate for the heads..
Man I give up on the head situation. Obvious enough the heads was the issue and now I have a running vehicle and everybody here is happy
right?
Justin Thomas
'01 Ta(hoe)
Just went back all stock for now
[Today 08:42 PM] murdered_outgmc: Gotta run to get the wifey some coffe and see if there is any rice on the road that needs to die
the head situation is really rather simple, you had a cammed 5.3 with a 8.8 to 1 compression ratio. dynamic compression ration would be even worse...
you would want to have about 2.2 points more on your compression. even if the wiring and everything else was done right you would have lost far mor power then you would have gained.
I'm not trying to be a dick, but no you did not research this if you tried to put this setup togather. buy a book on building performance engines, it will help you alot.
also shame on your "friend" for trying to give you that setup.
this would be your engine specs if you wanted to put it into a calculator
bore 96.01mm
stroke 92mm
gasket .053 inches
cc volume 66.67cc's
and here is a calculator to plug it into
Engine Size and Compression Calculator
stock 5.3 heads are 61.1x cc volume
ls1 heads are 66.67 cc volume
keep in mind that is if they are untouched combustion chambers, and alot of port jobs will shape the combustion chamber for better flow which enlarge it even more which would lower your compression even more.
Last edited by Lsx10; 07-30-2009 at 05:47 PM.
s10 with 4l60e and cammed 5.3 on the road!THREAD
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf.".
My point too. It should have run at 6.0:1 compression. Something else was the problem...something was disconnected that got corrected during the swap back to the other heads, the seats or spring set up was off holding the valves open and killing dynamic compression....something OTHER than the cc of the chambers obviously.
+1
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Thats what I was thinking.
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4
peanut gallery agrees...
Well some of the old flat heads...not just F**ds have more like 6:1 as previously mentioned
Dum Dum Dummmm, the plot thickens.
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4
-Whatever you say
....
Justin Thomas
'01 Ta(hoe)
Just went back all stock for now
[Today 08:42 PM] murdered_outgmc: Gotta run to get the wifey some coffe and see if there is any rice on the road that needs to die
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