alright, i have a stock cubed LS1 with 11.5 CR and TSP MS3 112LSA with supporting mods. basically everything has been touched except the crank, which was polished, chamferd and balanced.

the MS3 is rated at 603/609 now i have the TSP PRC2.56.0 heads in mind


i picked this one out cause at maximum lift it flows 316 cfm at .600(intake) which the MS3 is .603/.609 im lead to believe that with these heads i would be nearly maximizing the flow of the heads, given that i would lose around .010+/- through the lifters. although i know that maximum flow is not always the best and that the golden area would be velocity and volume.

 

Trick flow as cast 220 heads

 

How does your engine have 11.5:1 compression ? What heads does it have on it now ?

What is the combustion chamber size of the 6.0l heads your looking at. Most 6.0l heads have a 71-72cc combustion chamber witch would drop your compression down in the 9.5:1 range with flat top pistons. Which would be good in a forced induction application but not for N/A.

 

my pistons are 4.8cc domed. i sold the stock heads 853 casting, as stated on tsp the chambers come 65-72cc. the heads im looking at are new 317's the plan is N/A and further down the line nitrous/race gas direct port.

 

Don't buy heads based on max flow. You're only seeing that flow for a fraction of the combustion cycle. More important flow is .200"-.500" as your engine lives there even at WOT. The TFS As-Cast 220s are a good head for similar cash and will outflow the ported stockers in many cases.

And as far as maxing them out, where do the PRC heads stall? Is it at .600, .650, .700" lift? You don't want heads that stall out significantly before peak lift is achieved, but in this case, you don't have to worry about that. And by significant, I mean a stall in airflow at around .500" for a cam with .600" lift.

 

Lift Intake Flow Exhaust Flow
.200" 147 cfm 114 cfm
.300" 209 cfm 152 cfm
.400" 258 cfm 191 cfm
.500" 294 cfm 207 cfm
.600" 316 cfm 226 cfm

these are the numbers for the PRC2.56.0, ive compared these heads to others in that one sticky thread, although i see that these are comparable, everyones flow bench numbers are different. i compared the numbers to some higher end heads and the flow numbers where about 12cfm off per .100" in of lift and all the way to .600" they were 12cfm difference.

you may have to enlighten me on stall.....do you mean where the head starts to show less gain after so many in of lift? or where the heads max out based what they are rated for lift?

 

flow numbers are very deceiving. some are flowed on a 4.0 bore, other 4.030+

bigger bores will flow better, so when youre looking at those charts make sure it matches your combo.

 

The PRC ported GM casting heads don't go turbulent/stall until .700"+ for anyone curious.

 

Not only that, but bigger flow #s don't always equate to more power/torque.

 

yea your right, overlooked that

yea true, i suppose being slightly smaller cubic inch with a 3.903 bore i couldnt tell how much more airflow there is, with .097 difference, i can imagine it would negligible amount.....maybe?

they are 6.0 heads i guess maybe a standard 4in bore...where i have a 3.903 bore...it doesnt say what bore they were flowed on so i assume a 4in bore since they are 6.0 heads. PRC2.56.0



im guessing im trying to pick the right head for the cam. id thought those would be a good choice based on CFM vs lift. they are matched...the cam is not to big and the heads dont overly flow a **** load more than my engine can put out.

 

what this is going to boil down to is how much do you want to spend

 

CORRECTION, the heads where flowed with a 3.910 flow plate. so these heads sound good.

 

after a lot reading, and wanting to make as close too 500whp as possible, i think some AFR 205 or 215s are in order. i pm'd Mr. Mamo and he said they should work great.

opinions?

 

Afr 210s which are v2 205s are a great out of the box head and you really cannot go wrong with them another proven head is the tfs 215s which will make great power as well. I have seen many results yet but the prc aftermarket casting heads look like they could make power if setup right.

 

Atleast I'm getting pointed in the right direction.

 

with prc 2.5 5.3 heads TSP can sink the valves deeper into the valve seat for extra PTV.the trick flow heads have a 13.5 valve angle ,which helps with PTV.

 

Afr 210 or TFS 215 either one of those will be your top two performers.

 

Mamofied AFR 215 V2 with a little cam making 450whp SAE through an A4 and a 9" right here.

https://ls1tech.com/forums/dynamometer-results-comparisons/1601398-my-450whp-mamofied-1le-ss.html

Sick, sick, sick throttle response and the best tech support youll ever get. The other heads are surely good, but my experience with Tony from the support to on-time delivery, dealing with problems to results that will flip your lid were easily worth the price paid. I hate spending thousands with folks that dont even bother to answer your questions or return your calls.

It was a cold day at sea level here and my car was putting down 475whp STD.

 

how bout those PRC 215's? i did my research on those and liked what i read. Plus the PRC heads provide better PTV clearance, and use the same machines as AFR.

One thing i really like was they cater only to LSX based heads, among other things.

 

I have seen first hand what the TFS215 head can do. The heads flow great on the intake and exhaust. I made 462hp through an auto and 9", then put them on the current 402 and made 531hp.

Call TEA/TFS and talk to them.