LS6 Heads, ported ,shaved, no P/V clearence
03-15-2003, 10:35 PM
#1
LS6 Heads, ported ,shaved, no P/V clearence I installed 02 LS6 Heads with 2.02/1.60 valves shaved .030.Existing TR 224 on 112 cam .There was no P/V clearence on either valve.If started valves would be toast.Thanks to Jeff(LS1derfull)he caught this by measuring P/V clearence.We will be cutting valve reliefs.
This is just a Heads up for people installing a set of LS6 Heads.I have no idea how SPDC gets away with shaving .050 <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
This is just a Heads up for people installing a set of LS6 Heads.I have no idea how SPDC gets away with shaving .050 <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
03-15-2003, 10:40 PM
#2
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Re: LS6 Heads, ported ,shaved, no P/V clearence Well, there is a big "eye opener" for some folks here.
Your post may just save somebody a LOT of grief. Unfortunatly, it won't be read by all the people that may try the same thing sometime in the future.
Your post may just save somebody a LOT of grief. Unfortunatly, it won't be read by all the people that may try the same thing sometime in the future.
03-15-2003, 10:52 PM
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Re: LS6 Heads, ported ,shaved, no P/V clearence Couldnt you just go with 7.350 pushrods instead?
My LS6 heads are decked .055 and I just went with shorter pushrods.
<small>[ March 15, 2003, 10:59 PM: Message edited by: I8COBRA ]</small>
My LS6 heads are decked .055 and I just went with shorter pushrods.
<small>[ March 15, 2003, 10:59 PM: Message edited by: I8COBRA ]</small>
03-15-2003, 11:03 PM
#4
Re: LS6 Heads, ported ,shaved, no P/V clearence </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by I8COBRA:
<strong> Couldnt you just go with 7.350 pushrods instead?
My LS6 heads are decked .055 and I just went with shorter pushrods. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">How would that change P/V clearance????? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
<strong> Couldnt you just go with 7.350 pushrods instead?
My LS6 heads are decked .055 and I just went with shorter pushrods. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">How would that change P/V clearance????? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
03-16-2003, 03:42 AM
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Re: LS6 Heads, ported ,shaved, no P/V clearence Something ain't right there man. Are you sure you checked it right? You put the rocker pedistal on before you put the test rocker on right? If you dont, it'll make it look like it wont clear.
(dont laugh, i've seen this happen before!)
(dont laugh, i've seen this happen before!)
03-16-2003, 04:55 AM
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Re: LS6 Heads, ported ,shaved, no P/V clearence <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" />
Just kidding.
Where are you? have not seen you in any street meet!
<small>[ March 16, 2003, 04:51 PM: Message edited by: RUF SS ]</small>
Just kidding.
Where are you? have not seen you in any street meet!
<small>[ March 16, 2003, 04:51 PM: Message edited by: RUF SS ]</small>
03-16-2003, 07:29 AM
#7
Re: LS6 Heads, ported ,shaved, no P/V clearence </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by jmX:
<strong> Something ain't right there man. Are you sure you checked it right? You put the rocker pedistal on before you put the test rocker on right? If you dont, it'll make it look like it wont clear.
(dont laugh, i've seen this happen before!) </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">First we checked pushrod length.Ended up ussing a 7.350 lenth.Then mounted Head with test springs,installed pushrod,rocker assem. and put a dial gauge on the spring.While spinning the motor you can push the valve down to check P/V clearence.
Believe me,there was no clearence and the valve's would be gone if I started the car!!
<strong> Something ain't right there man. Are you sure you checked it right? You put the rocker pedistal on before you put the test rocker on right? If you dont, it'll make it look like it wont clear.
(dont laugh, i've seen this happen before!) </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">First we checked pushrod length.Ended up ussing a 7.350 lenth.Then mounted Head with test springs,installed pushrod,rocker assem. and put a dial gauge on the spring.While spinning the motor you can push the valve down to check P/V clearence.
Believe me,there was no clearence and the valve's would be gone if I started the car!!
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03-16-2003, 08:05 AM
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Re: LS6 Heads, ported ,shaved, no P/V clearence what rockers are you running if you are running say like a jessel 1.7 stock ratio i picked up 80thou lift and i had no p/v clarance and then i put the stock ones on and i was good with clearance jessel says the reason is the stock is not a true 1.7 ratio plus stock has a lot of deflection i think this thery go's with all aftermarket rockers just a thought good luck <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />
03-16-2003, 08:16 AM
#9
Re: LS6 Heads, ported ,shaved, no P/V clearence </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by tuff:
<strong> what rockers are you running if you are running say like a jessel 1.7 stock ratio i picked up 80thou lift and i had no p/v clarance and then i put the stock ones on and i was good with clearance jessel says the reason is the stock is not a true 1.7 ratio plus stock has a lot of deflection i think this thery go's with all aftermarket rockers just a thought good luck <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Stock 1.7's <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong> what rockers are you running if you are running say like a jessel 1.7 stock ratio i picked up 80thou lift and i had no p/v clarance and then i put the stock ones on and i was good with clearance jessel says the reason is the stock is not a true 1.7 ratio plus stock has a lot of deflection i think this thery go's with all aftermarket rockers just a thought good luck <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Stock 1.7's <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
03-16-2003, 08:21 AM
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Re: LS6 Heads, ported ,shaved, no P/V clearence Did you use the stock lifter when checking??? If so that's your problem. You must use a solid lifter when checking piston to valve clearance.
03-16-2003, 08:37 AM
#11
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Re: LS6 Heads, ported ,shaved, no P/V clearence Joe....
Well, I finally was transferred from Korea to Huntsville, AL
I am new to this area. I see that you are from Walker county. Isn't that a little north of Birmingham? Not too far from me. What track do you run at? All they have up here is an 1/8 mile track. Someone told me that Steele was fairly close, and is a full 1/4 mile. Maybe we could get togather one of these weekends for some racing. Well, I'm not racing you....Your car would kick my ***.
My e-mail address is in my profile.
Sorry to butt-in on this thread.
Ron,
Well, I finally was transferred from Korea to Huntsville, AL
I am new to this area. I see that you are from Walker county. Isn't that a little north of Birmingham? Not too far from me. What track do you run at? All they have up here is an 1/8 mile track. Someone told me that Steele was fairly close, and is a full 1/4 mile. Maybe we could get togather one of these weekends for some racing. Well, I'm not racing you....Your car would kick my ***.
My e-mail address is in my profile.
Sorry to butt-in on this thread.
Ron,
03-16-2003, 08:52 AM
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Re: LS6 Heads, ported ,shaved, no P/V clearence Darn Ron... we were in Moulton last night racing.
If I had known you were around you could have came over. I'll email you.
If I had known you were around you could have came over. I'll email you.
03-16-2003, 08:58 AM
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Re: LS6 Heads, ported ,shaved, no P/V clearence I'm with Joe. You need to cehck P/V clearance with a solid lifter. also you will need to adjust the rocker to zero lash. Doing it the way you did will definately show low clearances. I assume that the psitons in the car are not flycut?
03-16-2003, 09:12 AM
#14
Re: LS6 Heads, ported ,shaved, no P/V clearence So your saying that ussing the stock lifter with .06 preload and checking P/V clearence is not right?Sounds fishy.I really don't see how the clearence would be more with a solid??We were checking a running hieght which with the very slightest float will result in valves hitting the pistons!!
Remember that I have 2.02/1.60 valves that had a valve job,but were not sunk into the head to far because it hurts flow.This resulted in 300 cfm around .50 lift.
Remember that I have 2.02/1.60 valves that had a valve job,but were not sunk into the head to far because it hurts flow.This resulted in 300 cfm around .50 lift.
03-16-2003, 07:21 PM
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Re: LS6 Heads, ported ,shaved, no P/V clearence </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Slowhawk:
<strong> I installed 02 LS6 Heads with 2.02/1.60 valves shaved .030.Existing TR 224 on 112 cam .There was no P/V clearence on either valve.If started valves would be toast.Thanks to Jeff(LS1derfull)he caught this by measuring P/V clearence.We will be cutting valve reliefs.
This is just a Heads up for people installing a set of LS6 Heads.I have no idea how SPDC gets away with shaving .050 <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">BOOOOOOO you only went .30 I went .50 with jeffs heads. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Didnt you get new pistons like me? I got the JE's with -2cc valve reliefs? Either way you will get it right. Good catch before it was too late
<strong> I installed 02 LS6 Heads with 2.02/1.60 valves shaved .030.Existing TR 224 on 112 cam .There was no P/V clearence on either valve.If started valves would be toast.Thanks to Jeff(LS1derfull)he caught this by measuring P/V clearence.We will be cutting valve reliefs.
This is just a Heads up for people installing a set of LS6 Heads.I have no idea how SPDC gets away with shaving .050 <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">BOOOOOOO you only went .30 I went .50 with jeffs heads. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Didnt you get new pistons like me? I got the JE's with -2cc valve reliefs? Either way you will get it right. Good catch before it was too late
03-16-2003, 08:21 PM
#16
Re: LS6 Heads, ported ,shaved, no P/V clearence I'm still running the stock short block for this year <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Big thanks to Jeff for catching this.We'll be cutting the pistons by this weekend. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
03-17-2003, 07:46 AM
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Re: LS6 Heads, ported ,shaved, no P/V clearence </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Slowhawk:
<strong> I'm still running the stock short block for this year <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Big thanks to Jeff for catching this.We'll be cutting the pistons by this weekend. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Just great, so I have a chance of getting spanked buy a stock short block, my days ruined. hey Slowhawk, will you give me a hand with some intial tuning like, timing, idle and stuff with my ls1edit, the cars gonna be done by april.
<strong> I'm still running the stock short block for this year <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Big thanks to Jeff for catching this.We'll be cutting the pistons by this weekend. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Just great, so I have a chance of getting spanked buy a stock short block, my days ruined. hey Slowhawk, will you give me a hand with some intial tuning like, timing, idle and stuff with my ls1edit, the cars gonna be done by april.
03-17-2003, 09:01 AM
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Re: LS6 Heads, ported ,shaved, no P/V clearence </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Slowhawk:
<strong> No problem <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thanks alot! I will supply the beer and food <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
<strong> No problem <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thanks alot! I will supply the beer and food <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
03-17-2003, 09:43 AM
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Re: LS6 Heads, ported ,shaved, no P/V clearence </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Slowhawk:
<strong> So your saying that ussing the stock lifter with .06 preload and checking P/V clearence is not right?Sounds fishy.I really don't see how the clearence would be more with a solid??We were checking a running hieght which with the very slightest float will result in valves hitting the pistons!!
Remember that I have 2.02/1.60 valves that had a valve job,but were not sunk into the head to far because it hurts flow.This resulted in 300 cfm around .50 lift. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You need to use either solid lifters to check it, or you can use the stockers, but you need a test spring in the stock lifter to achieve the correct result. Remember that the stock lifters are hydraulic lifters that pump up with oil when they are running - which would achieve the same effect as a solid lifter when checking P/V clearance.
<strong> So your saying that ussing the stock lifter with .06 preload and checking P/V clearence is not right?Sounds fishy.I really don't see how the clearence would be more with a solid??We were checking a running hieght which with the very slightest float will result in valves hitting the pistons!!
Remember that I have 2.02/1.60 valves that had a valve job,but were not sunk into the head to far because it hurts flow.This resulted in 300 cfm around .50 lift. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You need to use either solid lifters to check it, or you can use the stockers, but you need a test spring in the stock lifter to achieve the correct result. Remember that the stock lifters are hydraulic lifters that pump up with oil when they are running - which would achieve the same effect as a solid lifter when checking P/V clearance.