PRC 5.3 2.5 to mill or not?

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Nov 3, 2008 | 09:38 AM

PewterMNZ

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PRC 5.3 2.5 to mill or not?

I have a full bolt on + cam M6 z28. Next step for me is to get the PRC 5.3 2.5 heads. I would like to hear the pro's and con's of milling probably 10mm.

I live in MN, drive it only in the summer, 92 octane is the highest we have in MN.

Nov 3, 2008 | 09:51 AM

Sales2@Texas-speed

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What camshaft are you running?

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Nov 3, 2008 | 09:53 AM

PewterMNZ

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TR230 reverse split.

Nov 4, 2008 | 07:34 AM

PewterMNZ

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TTT anyone?

Nov 4, 2008 | 09:11 AM

Sales2@Texas-speed

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Did you mean 10mm? Because that's ALOT of milling (about .40")! You should be able to mill those heads about .015" or so without piston to valve clearance issues. That will give a nice little bump in compression which will help your throttle response and mid-range numbers.

I personally would go with a .040" gasket instead of milling. You'll achieve roughly the same compression results, but with a better/tighter quench which helps ward off detonation issues.

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Nov 4, 2008 | 09:31 AM

PewterMNZ

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sorry, yes i meant .010" . So by running a thicker gasket it does the same thing as milling?

Nov 4, 2008 | 09:38 AM

Jason 98 TA

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Typically the thinner gasket is a little bit better than the milling. The good part of milling is it costs way less than Cometic gaskets... We typically like to run the cometic .040" when there's enough room!

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Nov 4, 2008 | 04:47 PM

phoenix1987

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Quote:

Originally Posted by PewterMNZ

92 octane is the highest we have in MN.

Wrong.

Nov 4, 2008 | 05:09 PM

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PewterMNZ

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Quote:

Originally Posted by phoenix1987

Wrong.

Sorry Luke, 90% of gas stations have 92, a select few in certain areas have 93, and a few places have 110 ...

Nov 5, 2008 | 11:39 AM

#11

phoenix1987

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Quote:

Originally Posted by PewterMNZ

Sorry Luke, 90% of gas stations have 92, a select few in certain areas have 93, and a few places have 110 ...

Just making sure you knew that you can get over 92 in MN.

Nov 7, 2008 | 09:20 PM

#12

PewterMNZ

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TTT any other opinions on whether to mill or to put a thinner gasket?

Nov 7, 2008 | 09:23 PM

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ZMONSTER!

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Thinner gasket unless you want to stay with a baby cam forever

Nov 8, 2008 | 06:38 AM

#14

PewterMNZ

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Quote:

Originally Posted by ZMONSTER!

Thinner gasket unless you want to stay with a baby cam forever

Is thinner gasket = less chance of detention correct? I want to make sure they are equal to HP gain. Whatever is going to give me the most HP is what I want to do .

Nov 8, 2008 | 06:50 AM

#15

sedanman

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From: Indy

I wouldn't mill for fear that you can never run a larger camshaft without fly cutting.

Nov 8, 2008 | 06:54 AM

#16

firefighter813x

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Buy the heads already! I want to get a idea how they work with my 230/227 cam.

Nov 8, 2008 | 10:35 AM

#17

SOMbitch

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Run a .040 Cometic. The downside is they ar $150 a set. And use the copper spray even though Cometic won't mention it.

Nov 8, 2008 | 03:05 PM

#18

phoenix1987

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Quote:

Originally Posted by firefighter813x

Buy the heads already! I want to get a idea how they work with my 230/227 cam.

I had the PRC 5.3s with my TR230. Car ran great and was fast! I put a car on a H/C MS3 ls6 intake car when I had a base tune and an ls1 intake. Great combo!