Jason 98 TA

iTrader: (4)

Just thought I'd let you guys know we're working hard to finalize the PRC 247cc ports! Shortly I'll post a flow bench video for you guys to enjoy! These heads have moved over 370cfm on our SF 600 bench. We have a few days left of tweaking before we settle on the final version, but we're very close.

Did I mention it'll be priced the same as all the other PRC cathedral heads? Bottom line is you don't have to pay $3,000 for a top of the line cathedral head!

I just keep thinking it's to bad this head wasn't done before the Hot Rod magazine shootout's cylinder head comparision. The PRC 237cc head moved more air than all the other cathedral heads. (even competitors 245s) Imagine if this head would have made it to that shootout! LOL

1CAMWNDR

iTrader: (21)

Very interesting. What are the valve sizes, chamber size options, and what bores will it fit (mine is 4.07")?

Detoxx03

iTrader: (14)

How would they work with a 232/239 cam?

TXZ28LS1

iTrader: (5)

definitely cant wait to see results

Jason 98 TA

iTrader: (4)

Give me some time guys & I'll get more data for you. Will post a flow video today.

It will go on a 4.070" bore no problem, infact hopefully I'll be flowing it some on that exact plate today!

lt1773

iTrader: (1)

any dyno or information on this?

Chaos07

Ya I wanna see how well these heads do on bigger cubes like the 408

xdanny510x

Good.enuff.for.a.408??

john563

iTrader: (17)

id like to know too..i have a 232/238 6xx 6xx 111 cam..also have your 5.3 heads and been happy with them thus far

Sales1@Texas-speed

These would be an excellent choice for anyone building an aggressive larger cubic inch motor!

Slowhawk

iTrader: (12)

I just built/dyno'd a 408 with the 237cc heads. Made great power at 500rwhp for a low compression 236 cam setup. More than I expected na. Now time for the 14 lbs of boost.

Will be ordering another set soon.

Sales4@Texas-Speed

iTrader: (4)

That is not half bad! Glad to see some of these results coming out.

lt1773

iTrader: (1)

Have tested PRC 247cc heads or not yet ?

lt1773

iTrader: (1)

i AM WAITING FOR ANY UPDATE

Sales1@Texas-speed

Just had another customer of mine finish up a build consisting of a TSP built 418, PRC 247s, TSP custom cam and all other supporting mods of course. Car made 574-575rwhp through a six speed. Customer is supposed to be sending me some updated graphs that I can post up. Several other builds are currently underway using the new 247s as well so hopefully we will have several other results to share in the near future from other customers.

usmcpi

iTrader: (2)

^With what cam?

Sales1@Texas-speed

Its 251/259 camshaft. Hope to have some updated track times in the near future plus the car has a healthy dose of nitrous as well so I expect it to perform pretty good.

lt1773

iTrader: (1)

any dyno ?

Sales1@Texas-speed

He hasn't sent me any updated graphs. Ill have to remind him.

chrs1313

iTrader: (24)

Very nice that is solid!!!