INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

Broke a rocker arm bolt...

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Old 03-11-2010, 03:36 PM
  #11  
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if i were you i would look into a set of 241's..
they flow about the same a 862s, but they have a 2" intake valve...
mill them a little bit so you don't loose any compression...
Old 03-11-2010, 05:19 PM
  #12  
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Thanks for the replies guys!

I found a good low milage head for 100$ , So im going to go that route, Need to get the truck running.

And i can save some money for my trans build/ stall.

After seeing a cam only turboed 5.3 put down 681 at the wheels, i think the stock heads will be ok for me !

If i were to Stat N/A i would def get some better heads, i think FI they will be ok.

I just got excited thinking, " Well, if i have to replace a head might as well upgrade" Im sure you guys know what i mean! LOL
Old 03-11-2010, 09:48 PM
  #13  
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If your budget allows, I'd give Richard at WCCH a call and tell him your plans...I know that WCCH used to offer a StageI 5.3 head that tdrumm installed on his old truck and showed some nice gains on the dyno. You could send those $100 5.3 heads right out to them...if time and budget allows.
Old 03-11-2010, 10:23 PM
  #14  
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Originally Posted by brent5631
If he does 317 heads he will drop about a full point of compression. which wouldn't be good for staying N/A.
It wouldn't be good for boost either. With compression that low you'd lose a head gasket before compression that low would be worth it. Compression below 9:1 just loses power at street boost levels. I believe the 681rwhp truck had an L33.
Old 03-12-2010, 09:00 AM
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and remember....22ft/lbs on those rocker bolts.
Old 03-12-2010, 04:48 PM
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Originally Posted by EVILGMC
and remember....22ft/lbs on those rocker bolts.
Yep !! Thanks!! I will be sure to heed this spec !!!
Old 03-12-2010, 05:17 PM
  #17  
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Make sure the torque wrench isn't messed up either. If it's old or wasn't taken care of properly it may be out of spec.
Old 03-12-2010, 05:41 PM
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speaking of torque wrenches, check out the Kobalt brand stuff at Lowes. They are supposedly made by the same people that make Snap on. My dad just got one of the 25-250ft/lb models and i really like it. much more so than the craftsman. plus it has a lifetime warranty, where the craftsman does not.

1/2" drive
3/8" drive
-patrick
Old 03-12-2010, 06:30 PM
  #19  
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Only reason I said make sure the torque wrench is good is because I sanpped a main cap bolt on a 6.5 pos. I was doing the second sequence to 65 ft/lbs and *snap* before the wrench even clicked. Turned out, the torque wrench I was using hadn't been checked out and re-calibrated in 5 years. I learned my lesson and have mine checked annually.
Old 03-12-2010, 09:20 PM
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Ouch!


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