Thanks

 

so if you flycut or go smaller than 59cc with a cometic .040 it is a wash...

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.

 

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.

 

Bang for your buck......how can TFS 220 As Casts be beat?

 

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.

 

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.

 

Texas speed uses 13.5 degree valve angles? If so why can you run stock rockers with the tsp heads and Tfs recomends roller rockers? I ask this question because I have a tsp torquer 2 cam (595/598 lift) and I'm second guessing running roller rockers with all the breakages that have been happening. I prefer to run the stock rockers with the trunion upgrade and .090" shims. Opinions needed !!!!!

 

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...

 

What are the valve guides made of on the PRC heads? Bronze or Iron?

 

Should i upgrade the guides to powdered metal? Tea will change the guides for $120.
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

 

So i would just need pushrods .100 longer than stock? 7.5 pushrods?
Thanks for that info.

 

Yep, 7.500" long, I have some that I used in my 427 that length that are the larger 3/8", as opposed to the standard 5/16", I'll take $60 shipped for em.

 

Sold, You take paypal?
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.

 

Money is sent. Thanks for the product and thanks for the education.