Jason 98 TA

iTrader: (4)

Guys we're proud to announce we have finalized the PRC 255 & 260cc LS3 aftermarket casting cylinder heads. These new runners are smaller than stock runners for improved velocity & move unmatched amounts of air! The 260cc runner moves right at 380cfm & the 255cc moves 370cfm!

255cc Heads Features:

260cc Heads Features:

Initial testing has shown the 255cc head to be capable of producing 600 flywheel horsepower through a stock intake LS3 engine on the TSP Superflow 902 engine dyno!

look for dyno data from strokers using the 260cc version very soon as we have several builds going together with them right now!

http://www.texas-speed.com/p-4008-pr...der-heads.aspx

http://www.texas-speed.com/p-4010-pr...der-heads.aspx

venom ws7

iTrader: (13)

Another amazing product from TSP Crew..
Great work I'm sure I'll be doing an order very soon with a set

Jason does it have 6bolt option?

Sam

Tainted

iTrader: (9)

nice id love a set of the 255cc but I dont have 2k+ for a set of heads. and at that point id prolly look at TFS or AFRs

Jason 98 TA

iTrader: (4)

These are LS3 castings & move considerable more air than every major competitors cathedral head. If your looking for the ultimate LS cathedral head checkout the PRC 237 & 247 cylinder heads. I think you'll find they're the ultimate in LS cathedral technology.

Tainted

iTrader: (9)

So lets say stock ls3 shortblock, moderate cam. Cathedral, or ls3 style? This would be for a street car roughly 2800lbs

Sales4@Texas-Speed

iTrader: (4)

I would do a cathedral head in that build. The mid range and low end power would be much better and it will still make great top end because those heads flow big air up top as well.

xdanny510x

would the 260 ccheads be suitable for a tsp 408?

Sales4@Texas-Speed

iTrader: (4)

Absolutely. With the smaller runner but big air should make great power. People have been putting ported LS3 heads on 408s for awhile, these should do pretty well considering they are moving more air then most ported stock LS3 casting but with a smaller runner still!

backdraft408

i have a set of your 250cc heads and want to know how much better your new heads are compared to mine?

Sales@Tick

iTrader: (3)

These look very promising, it will be nice to finally have a rectangle port head with a suitable sized intake runner for the 4.0-4.07" bore stuff.

blackls1ta00

iTrader: (27)

im gona go with the 247s on my 408 monster!!

XpEdItIoUs

iTrader: (44)

What set would you recommend for a boosted 370? I'm really considering getting a set how much bigger is the deck on these compared to stock castings?

Tainted

iTrader: (9)

Deck tgickness is .750" or 3/4 its real hefty.


Also since this is bumped...

408 (4.030 bore) stroker, street car
250, 255, or 260cc? Im thinking the 255 looks the most appealing and my ported ls3 intake wouldnt see the benefit of the 260 to make it worth it..

Jimbo1367

Jason,
Glad to see these look so promising. Did you guys ever get those builds finished that you mentioned in your first post? Dyno #s.........??????

XpEdItIoUs

iTrader: (44)

bump for these heads.

bmxer8699

iTrader: (16)

bump for results

Tainted

iTrader: (9)

FYI guys my 260cc heads will be here wednesday. It wont be till around xmas till im on the road though. But I can post up some pics

bmxer8699

iTrader: (16)

how long did it take for them to come in? I've tried calling their shop 3 times today and the line is busy.

Tainted

iTrader: (9)

I ordered them december 20th and was told 2-3 weeks. Well its been well over a month so good luck.

LSXHawk

iTrader: (27)

When u flow tested the heads what was ur bore size u used to test the heads? If u have a graph can u post it up and show us what all bore sizes u used?