AI's CNC 219 (241 castings) or PRC 2.5 ls6
12-18-2012, 10:28 AM
#42
Go back and look at the pics I posted of those heads from tsp and AI. Besides the heads not performing like they should have my beef was also with the cnc work. If u look at the intake and exhaust ports u will see the d ports on the ai look like d ports and the intake ports are cnc but still look like the factory design. the prc heads dports dont look like dports and the intake side looks nothing like the factory design. To me the ai heads are more detailed when it comes to their cnc program. To me that shows they took the time to get as much out of the heads as possible. I really feel the ai heads are the best being there heads with smaller valves they will out perform at the track and out perform on the flow bench The PRC cnc head.
However, they both put down similar numbers on a dyno.
Last edited by 427LS7HCI; 12-18-2012 at 10:44 AM.
12-18-2012, 11:21 AM
#43
11 Second Club
12-19-2012, 02:09 PM
#47
12-19-2012, 02:35 PM
#48
When I switched from factory 241s to TSP stage 1 243s it made a HUGE difference also, I picked up 5 mph.
Last edited by 427LS7HCI; 12-19-2012 at 04:36 PM.
12-19-2012, 05:05 PM
#49
Just saw the difference between the stage 1 and 2.5 from TSP seems like the only difference in price is from the larger valves in the stage 2.5 and the springs... And the flow #'s actually look better on the stage one on the intake side, and a bit better on exhaust on the 2.5's.
Is there any pros to running a larger valve as opposed to running the OEM valves?
Is there any pros to running a larger valve as opposed to running the OEM valves?
12-19-2012, 07:41 PM
#50
Just saw the difference between the stage 1 and 2.5 from TSP seems like the only difference in price is from the larger valves in the stage 2.5 and the springs... And the flow #'s actually look better on the stage one on the intake side, and a bit better on exhaust on the 2.5's.
Is there any pros to running a larger valve as opposed to running the OEM valves?
Is there any pros to running a larger valve as opposed to running the OEM valves?
I can tell you it puts more $$ in AIs pocket by re-grinding the stock valves and the customer doesn't really suffer from it and actually has better PTV clearance.
Customer preference....
12-19-2012, 09:17 PM
#51
Larger valves always tend to increase flow. However some will argue if the price and labor is worth the small if any noticeable gain. Comparing the TSP stage 1 to the stage 2, looks like the flow is greater with larger valves.
I can tell you it puts more $$ in AIs pocket by re-grinding the stock valves and the customer doesn't really suffer from it and actually has better PTV clearance.
Customer preference....
I can tell you it puts more $$ in AIs pocket by re-grinding the stock valves and the customer doesn't really suffer from it and actually has better PTV clearance.
Customer preference....
12-20-2012, 04:47 PM
#52
Larger valves always tend to increase flow. However some will argue if the price and labor is worth the small if any noticeable gain. Comparing the TSP stage 1 to the stage 2, looks like the flow is greater with larger valves.
I can tell you it puts more $$ in AIs pocket by re-grinding the stock valves and the customer doesn't really suffer from it and actually has better PTV clearance.
Customer preference....
I can tell you it puts more $$ in AIs pocket by re-grinding the stock valves and the customer doesn't really suffer from it and actually has better PTV clearance.
Customer preference....
We have excellent results for both the PRC stage 1.0 and stage 2.5 LS6 cylinder heads. You're right in that the added money for the stage 2.5's comes down to personal preference.
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