PRC 225 "as cast heads" Feedback?
Thread Starter
Staging Lane
Joined: Jun 2013
Posts: 69
Likes: 0
PRC 225 "as cast heads" Feedback? Hello, as the title states! I searched the forum and the web and still haven't found a lot of info on these heads? I know there are a ton I people running them, just looking for some INTEL on them!
How much rwhp do you think they would make?with this set up:
2005 Gto m6
Stock ls2 short block
233/239 cam on a 111 lsa
225 heads
Fast 102
1-3/4 arh
UDP
Ported 90 tb
Hendrix power chamber
46lb inj
How much rwhp do you think they would make?with this set up:
2005 Gto m6
Stock ls2 short block
233/239 cam on a 111 lsa
225 heads
Fast 102
1-3/4 arh
UDP
Ported 90 tb
Hendrix power chamber
46lb inj
Joined: Mar 2007
Posts: 1,145
Likes: 51
From: Saskatchewan, Canada - where arguing "DA" is for the slow and weak...
I gave these heads strong consideration before going with the PRC Stage 1 CNC'd LS6 heads (doing my own BTR spring upgrade) with very similar mods to yours on an LS1.
The obvious advantage of getting the as-cast heads is the room for growth they offer if you ever choose to send them back to be CNC'd.
The obvious advantage of getting the as-cast heads is the room for growth they offer if you ever choose to send them back to be CNC'd.
TECH Enthusiast
Joined: Apr 2010
Posts: 651
Likes: 10
From: North Carolina
I gave these heads strong consideration before going with the PRC Stage 1 CNC'd LS6 heads (doing my own BTR spring upgrade) with very similar mods to yours on an LS1.
The obvious advantage of getting the as-cast heads is the room for growth they offer if you ever choose to send them back to be CNC'd.
The obvious advantage of getting the as-cast heads is the room for growth they offer if you ever choose to send them back to be CNC'd.
Flow Data:
4.00" Flow Plate - No Exhaust Pipe
LIFT INTAKE FLOW EXHAUST FLOW
.100" 68 CFM 56 CFM
.200" 145 CFM 113 CFM
.300" 210 CFM 164 CFM
.400" 257 CFM 200 CFM
.500" 300 CFM 214 CFM
.600" 318 CFM 229 CFM
.650" 321 CFM 230 CFM
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wonder why TSP has such low exhaust flow numbers on all of the heads they offer?
TECH Enthusiast
Joined: Apr 2010
Posts: 651
Likes: 10
From: North Carolina
How does "no pipe" vs a pipe or other setup affect the flow numbers ?
Does one tend to "inflate" the numbers ?
Flow numbers don't mean much. If shops would publish their wet flow numbers, that'd be a better gauge.
Either way, it's really hard to compare flow numbers across vendors. The fixture, flow machine, and how the test is conducted can all change the characteristics of the flow pretty significantly and make comparing heads by CFM pretty worthless.
Either way, it's really hard to compare flow numbers across vendors. The fixture, flow machine, and how the test is conducted can all change the characteristics of the flow pretty significantly and make comparing heads by CFM pretty worthless.
Thread Starter
Staging Lane
Joined: Jun 2013
Posts: 69
Likes: 0
Flow numbers don't mean much. If shops would publish their wet flow numbers, that'd be a better gauge. Either way, it's really hard to compare flow numbers across vendors. The fixture, flow machine, and how the test is conducted can all change the characteristics of the flow pretty significantly and make comparing heads by CFM pretty worthless.
