vetteboyc5

iTrader: (9)

Texas speed released them earlier this year, Im having trouble doing my homework to see how well they work..

Im planning on using them for a 408.

Are they better than the afr 225?

BigRich954RR

iTrader: (1)

Yea you going to have to really look around for info on them,Its out there though.
Very nice heads its what im putting on my 427 boosted motor. I think there better then afr225 for a few reasons. I think the deck is thicker/ I love the fact the rail is raised a little.
come with nice springs and for 60 more very nice springs which a great for high rpms or boost. Flow very good numbers. the prc 237 heads are flowed with out a pipe. alot of heads are flowed with a pipe cause it raises the flow numbers which looks better on paper.

vetteboyc5

iTrader: (9)

does anyone have them on their car yet, any real wold results? Im about to pull the trigger in the very near future

Jason 98 TA

iTrader: (4)

We're getting ready to run another big run pretty soon. After that you'll have some results. We have dyno results on the engine dyno comparing the cylinder heads your discussing, but I don't want to post the results. Needless to say they worked very well though!!

We recently had several 418s go over 670flywheel hp with the 237cc heads.

http://www.texas-speed.com/shop/item...d=992&catid=40

Abdullah

iTrader: (2)

what is the valve angle of the PRC 237cc heads and the PRC 215cc heads?

i saw the PRC 215cc heads making very good power.

thanks.

BigRich954RR

iTrader: (1)

Info changed there on a 13.5 *

Didnt know that i love these heads the more i learn about them

black00ssFL

iTrader: (24)

I saw TSP say 13 degrees for the 215cc head in another thread. I'm really liking the little bit of info that's coming out from actual owners of these heads (215cc). It's just about swayed me from the trickflows since I can save about $700 over them and get the same, if not better, performance.

vetteboyc5

iTrader: (9)

can we get more information In terms of availability and HP numbers on a 408 with a texas giant and ported 90 90?

Sales2@Texas-speed

iTrader: (5)

The 215's and 237's are 13.5ş valve angle

Abdullah

iTrader: (2)

great, i thought they had 15* valve angle.

RAACCR

Jason or Matt,
With the larger valve size and 13.5* angle, are the PRC 237's compatible with the valve reliefs in Diamond 11576 pistons?

vetteboyc5

iTrader: (9)

bump for more information- I just purchased these heads! Waiting for them to be built

JakeFusion

iTrader: (7)

Do these require 7.5" pushrods? If any longer, are they machined to accept 3/8" to 5/16" LS7 type pushrods?

Sales2@Texas-speed

iTrader: (5)

Yes sir, they do require longer than stock pushrods (measure it to be accurate!). They work perfectly with a 3/8" pushrod!

JakeFusion

iTrader: (7)

Cool... does TSP sell them? I only see the 7.800" Comp Magnums on your site. I know you had Trend at one point - still an option?

Sales2@Texas-speed

iTrader: (5)

I got them added. Thanks for pointing that out!

http://www.texas-speed.com/shop/item...d=152&catid=51

transaman98

iTrader: (16)

I have been in the head market for awhile and both the 215's and 237's i have looked into before. How would either of these guys stack up on a stock shortblock ls1 with a 224/230 114lsa cam? Car is a weekend warrior street car that rarely sees the track.

Abdullah

iTrader: (2)

the 237cc heads will not work on the LS1 block due they have large 2.10" intake valves, these heads are for 4.010" and larger bores. the 215cc will work on LS1 block becuase they have small 2.04" intake valve which are for the LS1 block bore of 3.898".

transaman98

iTrader: (16)

good to know. it seems like there isnt too much info out there on the 237's.

driver240

i just finish to install PRC237 on my 427 LY6 and i lost 15wtq trough out the powerband and 10rwhp on top end so i removed them and re install my prc stage 2.5 heads..237 heads were 64cc and 5.3 stage 2.5 were 61cc...i was a very desapointed..!! put down 525RWHP and 506RWTQ with 2.5 and in a leaning condition of 13.5afr.. 516 and 493RWTQ with 237cc