xdanny510x

Lookin to upgrade my current l92/ls3 heads from prc the first batch of em to either the new tfs or the prc 260cc. Which would be better suited for a 408...has anyone seen comparison sheets between these too? Pros and cons?

lil john

With all these heads LS3/LS7 style heads there is no more than a 5 to 20 hp difference, it all up to your preference and budget.

Sales2@Texas-speed

iTrader: (5)

I would definitely recommend the PRC 260s for a 408 stroker like that. The bigger runner and valve will make great power up top while the efficiency of our port will maintain strong low end numbers. We have a number of strong combos running around using these heads now.

xdanny510x

I currently have ur first l92/ls3 heads from prc how much power do u think ill have over these.. the current ones were milled .030 if im correct and have 64cc ...

lil john

It' won't be no more than 5 to 20 hp max with same cam and comp.

bww3588

iTrader: (49)

The ls7 head it a totally different animal. You cannot put the two in the same comparison.

lil john

If you take mast ls3 vs tsp ls3....TFS ls3 what kind of diff are you talking bout. All these heads are basically the same. He may have the old TSP heads but i wouldn't Jump out on a limb and SAY some stupid **** like OH you're gonna get 50 extra out of a .3 degree diff in the heads he does have a 408 this ain't the 468 in that mag you may or may not have read.

Jason 98 TA

iTrader: (4)

I expect the TFS heads will be very nice. The PRC heads are proven performers & I've spent tons of engine dyno time with them so I'm very confident I'll put them against any LS3 head in the world. The PRC head has relocated valves which help a lot keeping the valves from being shrouded even on smaller bores, as well as altered valve angles. The PRC head uses a shorter valve compared to the TFS which will help with valvetrain control & spring life.

Both move right about 380 cfm.

checkout some of the prc dyno results, we've seen over 525rwhp on LS3 cars.

Good news is we are finishing up the as cast version of our 255cc PRC head. Look for pricing similar to the as cast cathedrals and airflow around 370cfm.

snowman47

Sweet! How long before the as-cast version will be available?

BoostedLT5

iTrader: (1)

Do the PRC heads have a thicker deck than stock? I am looking at building a boosted 370 ls2 and am trying to decide which heads to go with.

Jimbo1367

IIRC. the PRC heads have .750" deck.

Jimbo1367

LOL> WHere are these? I seen one post showing aftermarket PRC LS3 head dyno data. This was after someone at TSP promised it and only produced it about 6 months after the constant nagging from LS1 etchers. It would seem the results aren't as great as you'd hoped for. I know If I was part of a aftermarket head and thought it was a good product, I'd be sure to post it all over the forums AS SOON AS THE DYNO DATA became available.

YES.. I beat a dead horse with sharing dyno data, but common. You guys post here saying how it will outperform any other head, but don't offer any hard evidence ( even after a timeline you set) WITHOUT being called out on stand harped for 6 months. Kinda pathetic if you ask me (and yes you did. remember that e/m?)

TSP, why not post detailed dyno data in a link when someone is viewing a PRC head? Food for thought.

jlrz28

iTrader: (7)

My little 402 does good with my TFS215s...

lil john

I like the idea of a as cast LS3: version will pricing be as statedRC As-Cast 225cc LS1/LS2 Cathedral Heads Regular Price: $1,699.99 On Sale For: $1,599.99
I'm down with that idea just sell me the hollow valves No springs and we could discuss future Business. I have a thought of some one prepping the heads for me.

mike c.

iTrader: (1)

The T.F.S will be nice Texas speed? I say they would be. They are one of the best heads out next to AFR heads. I have had five sets of heads on different combos. I believe in what I have seen from what my money has got me. Buy the best once and never look back. I recall many sponsors telling me their head is as good or better than an AFR head. But, when I bought AFR, I gained 3 tenths alone. I have a 235 TFS head from TEA. I have a 10.4 car n/a still with power everything, heat, leather, heavy rear and steel shaft. They just perform...Period. Another thing...I had ported l92 heads on this 402ci. made killer numbers, 535hp . It was a lazy head and when going to a tfs head, I didn't gain a lot of power, but the car gained 3.5 tenths in the 1/4mi. I also don't believe sponsors dynoing their own product, if another shop or gm tech did it to see what all the heads do against one another, thats how it should be. Have gm tech put your product against others and let them get some real word data.

lil john

I'll say this Hot Rod also did a Cathedral port comparison on a 408 and:
The 237cc Texas Speed heads were dedicated castings that offered not only exceptional flow numbers but also additional head boltholes for use on the aftermarket LSX blocks. If you go looking to make a serious turbo motor with a set of cathedral-port heads, the extra clamping force offered by these extra bolts might be just what you need. The TS heads combined a 2.10/1.60 valve package with a 238/85cc port volume package to maximize airflow. Next to the AFR 245 heads, the TS heads offered the highest 0.500-lift flow numbers. Power production was every bit as impressive, and the average numbers were bettered only by the Trick Flow GenX head.

All these heads will be in the same ball park on LS3 sytle ports, THE intake will kill you before different head types TFS & TSP,AFR....WCCH..etc... if you step up to a larger port LS7 head design then it would be worth considering this is all 5 to 20 hp max difference between the top cylinder head manufacturers. I'll take a set of those TSP as cast LS3 heads for cheap $1500 and have Lets say Greg G. set them up for springs, valve job..port work and etc.......

BMF_Racing

iTrader: (6)

I'll have dyno #'s on a FI setup (101mm turbo) using the PRC 255 6-bolt heads in the next couple weeks. Build link in my sig. Installing Holley Dom Efi this weekend. I'll post all my numbers for what thats worth to everyone.

blake b

iTrader: (11)

I made 1026rwhp/861rwtq @ 22# with PRC 260 heads on a 377 with a ysi. I realize with FI heads aren't as important but it sure helped.

xdanny510x

Im really debating now on mast and tsp heads tho... been hearing great reviews about both... but im leaning towards one now... ..

blake b

iTrader: (11)

The PRC heads were around $2500 shipped. I also speced out a set of MAST heads and the retail on them was $3800. I could not see $1300 worth of power in the MAST heads. I realize actual street price would be a lower but they still weren't going to come in near the PRC heads.

The flow data I saw on the PRC vs the MAST had the PRC winning slightly and the PRC heads came with 2.185 intake vs the MAST 2.165 int. The PRC heads are 13 deg vs the MAST being 12 degree. 1 degree of valve angle was a moot point for me.