Jason 98 TA

iTrader: (4)

We're pleased to announce the PRC casting is just about complete & here's a teaser pic of the all new 237cc casting cnc ported & ready for install on a customers 408 iron block!

The 237cc port is a supersized version of the 215cc cylinder head that recently claimed the quickest heads cam record!! The 237cc port is designed for customers with 4"+ bore applications looking for a max effort cathedral port cylinder head!

The 237cc cylinder head ships with the following:

• 2.100" Stainless Intake Valves
• 1.600" Stainless Exhaust Valves
• PRC Double Spring Kit (.650" Lift)
• 68cc CNC Machined Chambers
• Provisions for Stock Rocker Arms or Aftermarket Rockers
• Increased valve cover clearance for aftermarket rocker systems
• Thick Deck for better sealing in power adder applications
• 6 bolt option standard for LSx blocks!
• .700" Valve Spring Upgrade Available!!

Flow Data:

Lift Intake Exhaust
.100" 66 cfm 57 cfm
.200" 147 cfm 117 cfm
.300" 225 cfm 170 cfm
.400" 284 cfm 206 cfm
.500" 325 cfm 227 cfm
.600" 334 cfm 235 cfm
.650" 339 cfm 241 cfm

More info available at:
http://www.texas-speed.com/shop/item...d=992&catid=20

Preordering for 215, 227 & 237cc versions available with estimated ship time of mid Jan.

itsjustaSB

iTrader: (13)

sweet they look great i know what my next set of heads will be when im looking for more power out of the 370 u guys are building for me right now this addiction never ends

TXZ28LS1

iTrader: (5)

man jason, those definitely look like a good piece!!!

Shawn MacAnanny

iTrader: (12)

Wow! cant wait to see some numbers on them

LS1-NAVY

iTrader: (1)

man makes me want a 408


good work guys

RJB01camaross

They look awesome!!! Like Shawn said cant wait to see some results out of them.

Beaflag VonRathburg

iTrader: (176)

That's a great price for a 6 bolt head. Are these 15* heads or are the valve angles altered? On the .700 lift springs are they still a 1.290-1.300ish spring diameter? What springs are they?

EDIT: I also noticed that you have the 215cc head on your site twice. I'm guessing that one of them was meant to be the 227cc since you have the 237cc head on there.

Double Edit: If I wanted to set these up with adjustable rockers would they necesitate a special rocker or could I use an off the shelf T&D, Jesel, Comp, etc...?

Jason 98 TA

iTrader: (4)

Working on checking several different aftermarket rockers, I'll let you know. I would seriously doubt the standard aftermarket rockers wouldn't fit. The new valve spring is a little bit larger than the standard 1.29" springs we're use to seeing, but it's big heavy valve friendly so the LS7/LS3 guys should be really happy!!

5.3LJimmy

iTrader: (10)

I'm guessing that since it's possible(though not recommended) to use the stock rocker arms that the valve angle has not been changed from stock. I'm curious to see the answer of this question myself.

Sales2@Texas-speed

iTrader: (5)

These are 13º valve angle.

Jason 98 TA

iTrader: (4)

ET 11 degree heads also can use stock rockers. The thing is valve guide wear is increased with stock rockers. The reason we went closer 13 degrees is it still allows us a reasonable valve length for weight issues, yet it helped to free up needed p/v so we can offer smaller chambers to those big camshaft guys!!

The cylinder head isn't limited to 13 degrees though, we have options to change this up down the road if we decide to go a different direction.

ZFSix

iTrader: (14)

Cathedral port = LS3/L92 right? So the FAST intakes won't work on these..

Jason 98 TA

iTrader: (4)

Not it's a traditional style port.

Sales2@Texas-speed

iTrader: (5)

Cathedral is the "old style" ports that you can use the FAST intakes on. LS3/LS7 and such are rectangular/square ports.

These heads work very well with a ported FAST

Super Speed

iTrader: (8)

Do you guys have a small bore version of these heads?

CalSpeedPerformance

iTrader: (64)

Yes they do, its the 215cc version.

CalSpeedPerformance

iTrader: (64)

Texas Speed: I tried asking a few questions on the phone earlier but didnt have all the info I was looking for.

A few questions:

1) Flow sheet for the 215cc and 227cc heads?

2) Alot of people looking to run the 237cc version will be doing so on a 4.125"+ bore builds. Can you flow these on a larger bore and put out a flow sheet?

3) Can you give the open/close seat pressure and spring diameter on the .700 lift spring setup?

4) Whats the valve diameter/specs standard? Will these accept only your valves or will they work with a standard LS1 spec intake/exhaust valve in the correct diameter. (If I am wanting to source custom valves for say an Inconel setup etc)

Sales2@Texas-speed

iTrader: (5)

Hope that helps you, Jim!

CalSpeedPerformance

iTrader: (64)

Thanks Matt for the quick info. I'll be ordering up a few sets shortly...ive got a few people on board.

Sales2@Texas-speed

iTrader: (5)

Sound good. Give me a call when you're ready!