I am running some 5.3 heads, that may be milled, .040 to raise the compression. I was wondering if I could use this cam, and not have to worrie about valve releifing the pistons. Cam specs are as follows

Cam is a 232/234 .595/.598 114LSA

I am going to go to a larger valves also, 1 step up on both. I will be using the graphite style head gaskets also. Thanks for the info.

 

The only way to know for sure is to check. Clay is probably the easiest if you don't have a dial indicator and light-tension checking springs.

You're looking for a minimum of .080 intake and .100 exhaust.

-Mindgame

 

Well, we are going against what we wanted to do, and are not milling the heads. 11.x:1 is well for the motor we are going to run. I am still worried about clearances, with the larger 2.05 valves.

 

with the setup you are talking about in the first post you would have PtoV issues no question. we ran our stage 2 5.3L heads milled .040 using 2.02/1.57 valves and a 232/238 .575/.585 cam and had to flycut the pistons.
we rent the flycutting tool setup if you decide to go that route.

 

What if i keep the heads the stock size, ie not milling them? Think I could use it then? How much do you charge for renting the tool? does it come with both intake, and exaust cutters/shafts? Thanks

 

if the heads are unmilled you will be fine, the tool is rented for $270.00 plus shipping, $150.00 for which is a refundable deposit. the tool setup comes with both intake and exhaust cutters, shaft, 90* adapter for getting to the back cylinders and a junk head to use so you don't damage your heads. shipping is about $25.00. there is a write up on our site on the process.

 

If you have P-to-V clearance problems with a head milled .040 (as suggested here in this thread) and decide not to remove the .040 after all, your clearance is still going to be inadequate. It's going to be .040 or less and that's no where near enough.

As I suggested earlier, the clearance needs to be at least .080/.100 (intake/exhaust) respectively. So do yourself a favor and forget about cutters right now. Mock the assembly up as mentioned before, and check the clearance. You need to account for compressed gasket thickness in your calculations. You are also looking for a radial clearance (edge of valve circumference to piston relief) of .040+.

-Mindgame

 

the cam in question with stock heads will give you about .080 clearance, even the T-Rex cam is safe with unmilled heads and the GM gaskets giving about .070 clearance. the problems with P to V clearance results from the milling and the larger valve not just from the milling, but even without the larger valves milling .040 would reduce tolerance to a mear .040ish
Mindgame- you are correct, the only way to be 100% sure is to mock up and use the clay test, though I am basing my answers on having done similar setups