Another MS4 what head Qs
11-19-2010, 08:14 PM
#1
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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 $$ and get my 243s ported?
Any imput from others would be great but Im thinking porting my heads is too wallet friendly to pass up..
But Iv ready about the PRC 215s and 227s. They are pricey and dont flow much different than a CNCd LS6 head? Iv seen good dyno numbers with the 215s but I wonder if the same or close to the same numbers could be had with just a nicely CNCd 243? Would it be worth teh trouble of flycutting to make the 215s work or save a lot of $$ 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..
11-19-2010, 08:42 PM
#2
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.
I believe Catech made 511rwhp with worked 243's and a 242/242 duration cam just to show the potential that 243's have.
11-19-2010, 10:35 PM
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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
11-19-2010, 10:41 PM
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11-20-2010, 01:18 AM
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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.
I believe Catech made 511rwhp with worked 243's and a 242/242 duration cam just to show the potential that 243's have.
).I'm right around 11:1, and even with a large cam/3600 stall (fairly tight FTI converter), the combo produces great low-end torque.
Last edited by Squirts11; 11-21-2010 at 08:43 PM.
