Another MS4 what head Qs

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Nov 19, 2010 | 08:14 PM

223HAWK

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From: Lake of the Ozarks, MO

Another MS4 what head Qs

Iv talked to my local speedshop about doing a headswap and I think I know what I want..but I just like to see everyones thoughts. My plan is to have my 243s CNCd. Reuse my valves to not worry about PVC. Im guessing Ill pick up 35-45 to the tire.

But Iv ready about the PRC 215s and 227s. They are pricey and dont flow much different than a CNCd LS6 head? Iv seen good dyno numbers with the 215s but I wonder if the same or close to the same numbers could be had with just a nicely CNCd 243? Would it be worth teh trouble of flycutting to make the 215s work or save a lot of $$ and get my 243s ported?

Any imput from others would be great but Im thinking porting my heads is too wallet friendly to pass up..

Nov 19, 2010 | 08:42 PM

180ls1

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I would suggest having the valves sunk in the head when getting them worked to improve ptv and also flycut. You are going to want to increase compression, or at least i sure would otherwise i dont believe it would be worth the cost.

I believe Catech made 511rwhp with worked 243's and a 242/242 duration cam just to show the potential that 243's have.

Nov 19, 2010 | 09:34 PM

408Maro

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I had a ms4 with 243s and made 450rwhp

Nov 19, 2010 | 10:02 PM

Dirty Vegas

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Quote:

Originally Posted by 180ls1

I would suggest having the valves sunk in the head when getting them worked to improve ptv and also flycut.

This doesn't make sense. You would still retain the same amount of downward travel.

Nov 19, 2010 | 10:15 PM

180ls1

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From: San Diego

Quote:

Originally Posted by Dirty Vegas

This doesn't make sense. You would still retain the same amount of downward travel.

why does TSP suggest doing this then when people order 2.5 243's and the ms3 cam?

Nov 19, 2010 | 10:35 PM

ls6firebird

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From: lee's summit, mo

id like to know how the 243s compare to the 215s too. i was planning on going with 215s. never really thought about whether or not porting my 243s would be comparable

Nov 19, 2010 | 10:41 PM

LSxWS.6

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Quote:

Originally Posted by 408Maro

I had a ms4 with 243s and made 450rwhp

i run a ms4 also and heard porting 241's can make close to the 450whp if not more with a ported fast 92, were you 243 ported or stock?

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Nov 20, 2010 | 01:18 AM

Squirts11

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From: OKC, OK

Quote:

Originally Posted by 180ls1

I would suggest having the valves sunk in the head when getting them worked to improve ptv and also flycut. You are going to want to increase compression, or at least i sure would otherwise i dont believe it would be worth the cost.

I believe Catech made 511rwhp with worked 243's and a 242/242 duration cam just to show the potential that 243's have.

Couldn't agree more. You'll really want to increase compression (gasket thickness and head cc) to bump your DCR, otherwise that cam really won't wake up until at least 4.5-5k rpms. Whether it's your daily driver or track car, if you're going to spend the money on an aggressive head/cam build, it'll be worth your while to do so (even if that means flycutting....