i was wondering, whats the max i can mill a set of 243 heads on a 5.3 with a tsp224 cam, before having issues with PTV clearance, and race fuel.

 

I Mill mine 0.030 , but I've seen people mill them 0.055 on a 113 lsa 224R on a flat top piston

 

i have 112 lsa, with 581 lift. i wonder if i would be okay will going .040

 

Keep in mind that if you get them milled too much you'll have to mill the intake mating side as well for proper sealing.

 

i milled mine .030 with a 222/226 596/598 111+2lsa cam with no issues.. got my compression to 10.5:1.. i think thats should b enough for that cam do act like a beast.. im on a flat top piston l33 engine if ur on a dished piston mill them .040 so u gain a bit on the compression side if not .032 will get u back to 9.5:1 which is stock

 

i wanna bump up the compression quite a bit. im thinking about milling them 50thou . what size head gaskets are you guys using ?

 

If you're wanting to bump compression go with either .045 or .051. Milling .05 on the heads I'd check and see if you'll need to take any off the intake side.

 

Mine are milled .030 and I used a .040 head gasket. My CR is right at 9.9:1

 

how do i go about measuring the intake side to see if i need them milled or not ?

 

what kind of gains am i going to see going from 706 heads to milled 243 heads