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bbowerman

10-07-2014 02:13 PM

842 ls heads milling Questions.

okay for you guys who know more about head milling and such...

on an 842 5.3 head I am about to do new head gaskets that are .010 thinner
if i mill my heads .030 will I have to change pushrods or anything? and how much difference does it actually make. I am going to have them ported and polished also. any suggestions or answers appreciated.

JohnDaMan

10-07-2014 06:16 PM

A .040 gasket and .030 off the head should net you a .7 to .8 compression increase. So you'll be about 10.3ish I believe. I would say it's worth it but to others it may not be. You will have to change pushrod length with that much difference in the deck thickness

bbowerman

10-07-2014 07:57 PM

just a .030 shorter pushrod or so?

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