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Which head is worth porting

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Old Oct 30, 2010 | 07:36 PM
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Default Which head is worth porting

I have a set of 5.3 and a set of 843s wich one's would be better to port i know there are Better heads out there but doin this on a budget what's the biggest cubic inch I could go with and still make good power with either of these heads
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Old Oct 30, 2010 | 09:12 PM
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Are you planning to change the valves or mill them? I think stock for stock, the 5.3 head has smaller valves, but also has smaller combustion chambers...
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Old Oct 30, 2010 | 10:22 PM
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Port and polished and valve job
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Old Oct 30, 2010 | 10:54 PM
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853s or 243s ?
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Old Oct 31, 2010 | 12:05 AM
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Originally Posted by garygnu
853s or 243s ?
I don't think he is referring to 243/799s however he could be.

OP whats your casting number on your 5.3 heads?
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Old Oct 31, 2010 | 09:23 AM
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If you are not going to mill the larger heads I would port the 5.3 heads and maybe slip in a larger intake valve.
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Old Oct 31, 2010 | 04:35 PM
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The 5.3 heads are casting number 862. The other heads are 853 of a 99 trans am a buddy gave me
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Old Oct 31, 2010 | 08:37 PM
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Kind of wondering the same thing. Subscribing...
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Old Nov 1, 2010 | 09:20 PM
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Any body got any input?
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Old Nov 1, 2010 | 09:25 PM
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you could port the 853s and then mill them down,best of both worlds.
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Old Nov 2, 2010 | 05:13 PM
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subscribing........i can get a set of 5.3 heads for next to nothing and have 853's on the car now with an ms3 cam and 90/90 setup. im curious to see what would be the better choice port the 853's or get the 5.3s and have those ported........decisions
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