i have a head gasket thats about to blow its in the early stages so i was thinking fo taking care of t right away soo im thinkin to my self why not port and polish the heads since thier gonna be off already.. but the thing is that i want to know if yall could help me and that is to what specs should i port and polish the heads to and also because im going to drop my cam in at the same time... the cam is a 224,224*568,114lsa would i be gaining anything from the port and polishing with the cam?



MOds: pacesetter long tubes, custom synergy tune, aem intake , airraid throttle body spacer, corsa exhaust, 3in pipe, no cats..

btw its a 2005 chevy silverado 5.3L

 

Definitely port the heads, install larger valves and have them milled to gain compression. That cam is going to need at least 10:1 to make torque and carry it into the upper rpm ranges.

Good luck,

Richard

 

YOu will want as much compresion as possible on that stock converter!

 

so to what specs should i mill them too and polish them to get the right compression ? im gonna be running a 3000 stall sooner or later ... how much gain should i see with the cam and polished milled heads? im pushing 310 rwhp and 316 rwtq

 

Mill the heads .030". That will get the c/r over 10:1 and yet leave some thickness left for future milling if needed.

Richard

 

Richard,
How much does the geometry change when milling heads .030, i.e intake, headers, pushrods? What kind of gain can be expected? And the price for your 5.3 small bore heads milled .030?

 

About the only thing to be concerned about when milling is the pushrod lengths. When we service and mill Gen 3 heads at least .030" we prefer to use 7.350" pushrods to compensate for the the slightly long tip length and head milling. The intake and exhaust manifolds don't seem to have a problem with head milling.

Richard

 

how bout the 7.4oo length pushrods would they still work if i get the heads milled and polished? as far as in horsepower with a good retune with the cam and head work how much should i expect? should i changed the rocker arms as well?

 

Keep the stock rocker arms and change to the shorter pushrods if you mill the heads. Your hp increase is going to depend on exactly what cam you choose, but an increase of 75rwhp is achievable.

Richard

 

im going with a 224/224 .568* 114lsa cam
custom cam
so intstead of getting the 7.400s go wit the 7.350?
should i run a 3000 stall? cause i was planning on hold off on the stall