Loss of HP

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Mar 11, 2003 | 03:10 PM

CamM

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From: Sachse, TX

Loss of HP

I bought my 6.0L heads from a local head porter in Houston. I took the heads back off to investigate why I wasn't making the HP numbers like I should. Found out the valves weren't seating properly and I could see light through the bottom of the valves. Anyway, I was basically told by him this is normal for a street/strip head and that valves seal better when hot. I don't want to flame this guy, just wanted to hear un-biased opinions. Any thoughts?

Mar 11, 2003 | 03:28 PM

a1s2d3f4

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From: cypress

Re: Loss of HP

The way to check that is with a leak down test. If you get 0 to 2 hot(If you check it cold it will be about 3 to 5) it will be ok. If you get more you might need to get it check out.

Mar 11, 2003 | 03:49 PM

L4m3r

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From: San Antonio TX

Re: Loss of HP

why would this be any different from stock heads? I have never seen light from them <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> can you explain that?

Mar 11, 2003 | 04:02 PM

CamM

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From: Sachse, TX

Re: Loss of HP

<blockquote>quote:<hr />Originally posted by a1s2d3f4:
 The way to check that is with a leak down test. If you get 0 to 2 hot(If you check it cold it will be about 3 to 5) it will be ok. If you get more you might need to get it check out. <hr /></blockquote>Also, the valves are not seating flush in the combustion chamber and I was already told I need a valve job by a third party. It just doesn't seem normal. They are 2.02/1.57 Ferrera valves..btw

Mar 11, 2003 | 04:22 PM

TEA Brent

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From: Bowling Green, KY

Re: Loss of HP

Those are the valves that I use and they seal perfect when cold and hot. I assure you if done right those valves will not have any light. The valve job must be really out of shape. I vaccum check every chamber upon completion, I think it should be a manditory step for everyone to use otherwise stuff like your situation happens.

Mar 11, 2003 | 05:11 PM

a1s2d3f4

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From: cypress

Re: Loss of HP

<blockquote>quote:<hr />Originally posted by TEA Brent:
 Those are the valves that I use and they seal perfect when cold and hot. I assure you if done right those valves will not have any light. The valve job must be really out of shape. I vaccum check every chamber upon completion, I think it should be a manditory step for everyone to use otherwise stuff like your situation happens. <hr /></blockquote>This set of heads has been run already

[ March 11, 2003, 05:16 PM: Message edited by: a1s2d3f4 ]

Mar 11, 2003 | 05:26 PM

L4m3r

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From: San Antonio TX

Re: Loss of HP

funny i had a set that were never run and he told me this problem would go away after they were run.... <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

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Mar 11, 2003 | 05:39 PM

a1s2d3f4

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From: cypress

Re: Loss of HP

<blockquote>quote:<hr />Originally posted by L4m3r:
 correct me if im wrong... but if your using 2.02/1.57 valves wouldnt that be the stock seat? and if that is true... shouldnt every set of s <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> tock "run" heads have this same problem???? <hr /></blockquote>Yes you are correct, they should use the same seats. But with aother valve job.

Mar 11, 2003 | 05:40 PM

#10

JPR

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From: New Jersey

Re: Loss of HP

Anyone here should never see light between the seat and valve ever in any head performance or stock. there is a specific seat to valve contact area, if that has been established and your still seeing light then you have either bent valves or a cockeyed seat.
Joe.

[ March 11, 2003, 05:42 PM: Message edited by: JPR ]

Mar 11, 2003 | 06:52 PM

#11

JS12

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From: north dallas

Re: Loss of HP

<blockquote>quote:<hr />Originally posted by a1s2d3f4:
 <blockquote>quote:<hr />Originally posted by L4m3r:
 correct me if im wrong... but if your using 2.02/1.57 valves wouldnt that be the stock seat? and if that is true... shouldnt every set of s <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> tock "run" heads have this same problem???? <hr /></blockquote>Yes you are correct, they should use the same seats. But with aother valve job. <hr /></blockquote>can you explain this "valve job" <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
i was told that you would have to cut down the seat to fit the 1.57 valve....

Mar 11, 2003 | 08:13 PM

#12

JordonMusser

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Re: Loss of HP

you should not see ANY LIGHT, period. you need to do a fresh valve job on them.. and check to make sure the valves arent bent

Mar 11, 2003 | 09:10 PM

#13

DaleMX

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From: Atlanta, Georgia!

Re: Loss of HP

Upon having a ASA valve job done on my heads, I had to shim the rockers up .030 just to get mine to close. Hope this helps. (assuming that the head is on the car still).

Mar 11, 2003 | 10:25 PM

#14

Texas Terminator

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From: Beaver Falls, PA

Re: Loss of HP

THROW THE HEADS THROUGH HIS FRONT WINDOW!!

JUST KIDDING!! EXCELLENT VALVES, CRAPPY JOB. SOMETHING IS DEFINATELY WRONG. YOU SHOULD NEVER SEE ANY LIGHT THROUGH THE VALVES, HOT OR COLD.

Mar 11, 2003 | 10:26 PM

#15

Texas Terminator

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From: Beaver Falls, PA

Re: Loss of HP

THROW THE HEADS THROUGH HIS FRONT WINDOW!!

JUST KIDDING!! EXCELLENT VALVES, CRAPPY JOB. SOMETHING IS DEFINATELY WRONG. YOU SHOULD NEVER SEE ANY LIGHT THROUGH THE VALVES, HOT OR COLD.

Mar 11, 2003 | 11:58 PM

#16

Louis

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From: Frisco/Wylie

Re: Loss of HP

Cameron, What are your plans now? feel free to PM or email me. Ill be in town saturday, for an entire week, you should stop by <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Mar 12, 2003 | 07:08 AM

#17

CamM

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From: Sachse, TX

Re: Loss of HP

Thanks for the responses. Apparently this head porter thinks all of us are wrong and he is right. I now know of 3 heads from this porter that have had the same problem. Buyer beware.

Sent you a PM, Louis.

Mar 12, 2003 | 08:26 AM

#18

BigTex

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From: East of Dallas

Re: Loss of HP

<blockquote>quote:<hr />Originally posted by CamM:
 ...I now know of 3 heads from this porter that have had the same problem. Buyer beware.
<hr /></blockquote>Might be helpful to know who ported your heads. Send me a PM if you don't want to post it. Thanks

Mar 12, 2003 | 10:23 AM

#19

FreakZ

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From: Coppell, TX

Re: Loss of HP

<blockquote>quote:<hr />Originally posted by CamM:
 Anyway, I was basically told by him this is normal for a street/strip head and that valves seal better when hot. <hr /></blockquote>That does not sound like something he would say?

Mar 12, 2003 | 10:33 AM

#20

L4m3r

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From: San Antonio TX

Re: Loss of HP

<blockquote>quote:<hr />Originally posted by Silver99LS1:
 <blockquote>quote:<hr />Originally posted by CamM:
 Anyway, I was basically told by him this is normal for a street/strip head and that valves seal better when hot. <hr /></blockquote>That does not sound like something he would say? <hr /></blockquote><img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

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