AFR, Trick Flow, or Texas Speed?
As Jason mentioned above, the most significant advantage the PRC 215's have over the TrickFlow on a large cam combo like that is that we can get you a smaller chamber (more compression) without sacrificing your piston to valve clearance on flat-top pistons! On that extra large camshaft, that extra clearance and peace of mind is always welcomed!
Do you guys have anyone else out there with a street car that runs your prc 215 heads...with track results
all I ever see is the shop car mentioned which is great but would love to see some customer cars running low 10s or high 9s with those heads...
I don't see anyother cars on the lists with them?
There are alot of these heads out there already, and I expect to see more and more results very soon. Just remember they are a relative "new guy" as compared to AFR and TrickFlow, so they of course haven't had as much time to make all the lists yet.
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
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I loved my Trickflow as casts! I had them milled to 60cc's for a vrx5 cam, a FAST, UD pulley, and pace headers and it made 457hp on a mustang dyno. It has different valve angles and has alot of more meat than the other castings IMO. Its a tried and true with all the results to back it up. TFS hands down.
I would love to see some prc heads at the track. I keep hearing about them,would like to see what they can do for myself. My afr heads car was stomping on gtp,rgr and patriot head cars back in the day.. most of us all had fast intakes and simular boltons.
I have trick flow 235's now and went 10.63 at 130mph at 3,680lbs,m6 car granny shifting.
I have trick flow 235's now and went 10.63 at 130mph at 3,680lbs,m6 car granny shifting.
Last edited by mike c.; Nov 10, 2010 at 08:13 PM.
If the TFS heads are milled .015" or to about 61cc they have the same P to V clearance as a stock head.
If the PRC heads achieve this at 59cc, this means there is a .012" difference in P to V between the two, which is very little difference.
It only makes sense that there is little difference in the two since the PRC heads copied the 13.5 degree valve angle of the TFS heads.
If the PRC heads achieve this at 59cc, this means there is a .012" difference in P to V between the two, which is very little difference.
It only makes sense that there is little difference in the two since the PRC heads copied the 13.5 degree valve angle of the TFS heads.
Staging Lane
Joined: Aug 2007
Posts: 80
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If the TFS heads are milled .015" or to about 61cc they have the same P to V clearance as a stock head.
If the PRC heads achieve this at 59cc, this means there is a .012" difference in P to V between the two, which is very little difference.
It only makes sense that there is little difference in the two since the PRC heads copied the 13.5 degree valve angle of the TFS heads.
If the PRC heads achieve this at 59cc, this means there is a .012" difference in P to V between the two, which is very little difference.
It only makes sense that there is little difference in the two since the PRC heads copied the 13.5 degree valve angle of the TFS heads.
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Verdad Gallardo run the shims and stock rockers then...also all aftermarket bronze guide heads should have roller rockers...which is about every set besides ls6 worked heads...TFS recommends it while the others don't say anything...funny how when they recommend it, which others should too, catch the association you have to run roller rockers with TFS heads or your engine will blow up,ha 
...and 13.5* vs 15* is not the reason...
...and 13.5* vs 15* is not the reason... 
Staging Lane
Joined: Aug 2007
Posts: 80
Likes: 0
run the shims and stock rockers then...also all aftermarket bronze guide heads should have roller rockers...which is about every set besides ls6 worked heads...TFS recommends it while the others don't say anything...funny how when they recommend it, which others should too, catch the association you have to run roller rockers with TFS heads or your engine will blow up,ha ...and 13.5* vs 15* is not the reason...
...and 13.5* vs 15* is not the reason...Bronze, Since i havnt heard much about these, i will have to go with the tfs 225. Tfs 225's are actually cheaper than the prc's.
Any head using bronze guides should use roller rockers, if you use stock rockers DON'T SHIM THEM, that simply accelerates the guide and valve tip wear.
If TEA will install powdered metal guides for you, then run stock rockers with the trunion upgrade. I run powdered metal guides with stock rockers on my TFS heads
If TEA will install powdered metal guides for you, then run stock rockers with the trunion upgrade. I run powdered metal guides with stock rockers on my TFS heads
Staging Lane
Joined: Aug 2007
Posts: 80
Likes: 0
So i would just need pushrods .100 longer than stock? 7.5 pushrods?
Staging Lane
Joined: Aug 2007
Posts: 80
Likes: 0
Thanks for the great advice. I was stuck between a rock and a hard space. I dont trust the aluminum rockers and was not 100% on the shim/push rod method. I feel good about this installation.
You should also have TEA install the "Platinum" springs instead of the standard "Max Pressure" springs. The "Platinum" are 400 lbs open and work great with the stock rockers, the "Max Pressure" are 450 lbs open and are made for the heavier roller rockers. The higher open pressure with the stock rocker increases the possibility of valve tip wear.
