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largest valve size in a 5.3L head?

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Old Aug 8, 2002 | 11:16 PM
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Default largest valve size in a 5.3L head?
Does anyone know the largest valve size the stock seat in a 5.3L head can be made to accept?

Thanks, Jason
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Old Aug 9, 2002 | 12:26 AM
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Default Re: largest valve size in a 5.3L head?
Well we know mine fit.
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Old Aug 9, 2002 | 12:34 AM
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Default Re: largest valve size in a 5.3L head?
2.02 1.57
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Old Aug 9, 2002 | 08:07 AM
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Default Re: largest valve size in a 5.3L head?
The seat counter bores on the 5.3l heads measure 2.036" intake, and 1.587" exhaust. Add .006" for press fit.

Richard <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
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Old Aug 9, 2002 | 08:36 AM
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Default Re: largest valve size in a 5.3L head?
So how did I get 2.08x1.60's in there? Sounds like a magician did my heads then. If what I am hearing is true. That would explain my drivetrain issues from day one...

<small>[ August 09, 2002, 08:41 AM: Message edited by: VINCE ]</small>
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Old Aug 9, 2002 | 08:40 AM
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Default Re: largest valve size in a 5.3L head?
They put in new seats.
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Old Aug 9, 2002 | 08:43 AM
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Default Re: largest valve size in a 5.3L head?
New Seats.. You guys were scaring me for a minute there.. Thanks.. I just did not need anymore bad news..
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Old Aug 9, 2002 | 09:59 AM
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Default Re: largest valve size in a 5.3L head?
I am running 2.10" Intake and 1.60" Exhaust valves with my MMS 5.3L Stage IIIx heads <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
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Old Aug 9, 2002 | 10:06 AM
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Default Re: largest valve size in a 5.3L head?
That is big..
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Old Aug 9, 2002 | 04:46 PM
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Default Re: largest valve size in a 5.3L head?
Thanks for the replies <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Vince, I too was worried when I all of the sudden I imagined your valves ghetto'd into stock seats...man that would explain everything! But fortunatly that is not the case. I will drop you an IM later.

So it looks like 2.02/1.57's will fit in the stock 5.3L seats I guess (thanks Jantzer). Can anyone confirm this for me once more just to be sure?

Thanks again
Jason
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Old Aug 9, 2002 | 08:22 PM
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Default Re: largest valve size in a 5.3L head?
Yes, 2.02/1.57 will fit fine in the stock seats with a good valve job.

Jason
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