H/C Install help
Originally Posted by 1999ssls1
so i can reuse my headbolts and felpro gaskets on my 6.0
Thanks for the all the info. I will contact TSP tomorrow regardingin the pushrods before I pull the head (last resort) and clay it, I do have the ARP bolts so I can reuse them. To the question where is the resistance is occuring, I start with TDC on #1 and it starts to resist just a bit after i begin to start to turn the motor.
if that is the case then you need to clay the nember 6 cylinder if i think right. anyways also the statement about the .012 clearence not enough, when you install a big cam and 243 heads non milled .012 has to be fine because if you use a bigger gasket the compression goes down. no use with a MS4 with 9.2 compression on a NA car. are these your first set of good springs that you have experienced because the extra pring rate could be messin with your head. a good spring could make it a little harder by hand to rotate.
This is my first experience with double springs, so I have thought it can be because of them. But there is more resistance with the intake valve then the exhauset valve, can this be attribute to the cam lift specs?
when you pull the head off ,look at the piston for valve marks in it.sounds like you might have a clearance problem.maybe those heads have been milled too much by mistake. im only guessing,call tsp .they will help ou out.
Hey I just got the same set-up and texas speed told me to go with the 7.4 pushrods. Talk to them at least twice a week. If they're the stock head gaskets they're .052 just to let ya know. Should clear just fine
Originally Posted by 1999ssls1
so i can reuse my headbolts and felpro gaskets on my 6.0
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Will the crank rotate past the point you are at? If so you are building compression. Rotate the crank one full revolution and post back up with results. The rotation will get tense then release once you hit exhuast.
http://www.gmhightechperformance.com...onclusion.html
Not to argue about the milling or the pushrod length, just so you all see where I got my info. I don't know what may be causing this, but I would want a definite answer before firing it up.
Not to argue about the milling or the pushrod length, just so you all see where I got my info. I don't know what may be causing this, but I would want a definite answer before firing it up.
I spoke to TSP and confirmed that 7.40 pushrods are good and that these heads actually have a tiny bit more PTV clearance then stock. So shouldn't be a problem. I double checked my dot to dot and everything is good. I think I was just a little paranoid since this is my first H/C swap. Couple of other reasons I am going forward:
1. Researching same combo does not indicate others had same issue
2. Can not hear any metallic touching
3. Can continue crank rotation past point of resistance.
4. Resistance begins just a bit after TDC of #1, piston on way down and intake valve opening and resistance stops once hitting exhaust.
You might be saying to check to ensure, but I feel very confident and in the end its my call. I will let you know what happens.
1. Researching same combo does not indicate others had same issue
2. Can not hear any metallic touching
3. Can continue crank rotation past point of resistance.
4. Resistance begins just a bit after TDC of #1, piston on way down and intake valve opening and resistance stops once hitting exhaust.
You might be saying to check to ensure, but I feel very confident and in the end its my call. I will let you know what happens.
Originally Posted by cjh
i went to rotate the engine over with 2 rockers installed
Mine did the same exact thing with only a couple rockers installed.
I was worried I screwed something up, ALOT of resistence in only one part of the rotation.
Installed all rockers, smooth as butter all the way around.
There's mechanics involved that tell me this makes sense but I'd have to stop and think about why.
I think it has something with the concept of why stronger springs don't make it harder for the cam to spin, something about when one's compressing another is expanding.
Just a thought, or half a thought.
Last edited by DirtyJohn; Feb 20, 2007 at 11:07 AM.
Originally Posted by RZRSEDGE
I REALIZE that it's your call, you asked for help and this is what I offered. I'm not trying to tell you what to do just help! 
Originally Posted by cjh
Thanks for the all the info. I will contact TSP tomorrow regardingin the pushrods before I pull the head (last resort) and clay it, I do have the ARP bolts so I can reuse them. To the question where is the resistance is occuring, I start with TDC on #1 and it starts to resist just a bit after i begin to start to turn the motor.
Just my $0.02
update
i used checking springs and cranking the motor by to check ptv, reasoning being cause i havent seen anyone with ptv issue so i was just double checking.
started right up, oil is up to around 60 psi and left it running till operating temp. i have open headers and it sounds insanely mean
. have to take it to a shop for true duals with flowmaster single chambers and tune.
thank you everyone for you help and patience. if only you can see the grin on my face.
i used checking springs and cranking the motor by to check ptv, reasoning being cause i havent seen anyone with ptv issue so i was just double checking.
started right up, oil is up to around 60 psi and left it running till operating temp. i have open headers and it sounds insanely mean
. have to take it to a shop for true duals with flowmaster single chambers and tune.thank you everyone for you help and patience. if only you can see the grin on my face.