2010 5.3l silverado heads question....
12-06-2011, 05:08 PM
#1
Staging Lane
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2010 5.3l silverado heads question.... at work today, while I was doing the oil change, I look at the head casting number and see 243... so my question is; do they are the same thing than the ls6 heads but with rectangular port ( and provision for DOD...) or they are cathedral port??? 
12-06-2011, 06:34 PM
#2
The 243 heads are the LS6 heads as you stated. But they shouldn't be the lightweight valves the LS6 have though. They are cathedral ports. I just got the same heads a few months ago. I plan on sending them to TEA for porting. AI has stellar results too. Try a SEARCH if you are interested.
I don't think the heads have anything to do with DOD.
I don't think the heads have anything to do with DOD.
12-06-2011, 11:03 PM
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I throught that GM make the change for the rectangular when they switch for the 4th gen LS even on the small displacement... I already know for the sodium-filll valve from de ls6 243. I just use them for casting comparaison....
I just ask cuz it seem that I diidn't do my homework correctly hahaha!!!
I just ask cuz it seem that I diidn't do my homework correctly hahaha!!!
