Red12secZ28

iTrader: (2)

I just got my new summit magazine and they have the new trickflow heads in them. Just wondering if anyone knows flow numbers or anything else about them other than that they have a 13.5 degree valve angle.

Okie5.3

iTrader: (1)

from there site

During the development stage, engineers determined that the valve angles needed to change from 15° to 13.5°. This change decreased valve shrouding, increased mid-lift airflow, and increased rocker arm-to-valve cover rail clearance. Testing also proved that relocating the spark plug position in the combustion chamber further enhanced mid-lift airflow and increased the rigidity of the casting to prevent cracking in the chamber area. Furthermore, additional material was added to the rocker arm mounting points for high-rpm valvetrain stability.
These new fully CNC-ported LS1 performance cylinder heads feature 215cc intake runners, 80cc exhaust runners, 64cc combustion chambers, 2.04" intake valves, 1.575" exhaust valves, bronze valve guides, and ductile iron intake and exhaust valve seat inserts.

Assembled CNC-ported LS1 heads come equipped with 1.300" dual valve springs (for hydraulic roller camshafts up to .600" of valve lift), Viton canister-style valve seals, 7° machined steel valve locks, and 7° titanium retainers.

I------E
68----55--.100
142--115--.200
215--185--.300
260--230--.400
300--251--.500
320--259--.600

NOTE:
Tests conducted at 28" of water (pressure) on a 3.900" bore fixture.
CNC-profiled chambers; exhaust with 1 7/8" pipe.

rufretic

iTrader: (37)

Sounds interesting, how much?

Red12secZ28

iTrader: (2)

Summit has them for around $2300. They come cnc ported.

ShevrolayZ28

iTrader: (4)

INteresting. 13.5 valve angle. Kind of like the ET heads

Leo@GMRSPEED

iTrader: (2)

If you are looking to purchase these get ahold of us at GMR and we can get you hooked up, we are lucky to have the awsome guys at Trickflow right in our backyard

2001 Pewter WS6

iTrader: (43)

The part I don't understand is that they are worried about max P/V ratio yet they only put a spring on that is good to .600 lift . The majority of the people out there that are going to put these heads on their car are also going to be running a decent size cam. Why not have it come with a set of springs that are good to .625 or .650 lift?

PREDATOR-Z

Because lifts have almost nothing to do with PTV clearance issues.
PTV is relative to size of valves, angle of valves and Valve Events of the cam.
215 head is obviously with stock cubes in mind, and staying < or @ .600 lifts is able to make plenty of power, when attention to details is duly paid .
Most poeple tend to overcam, but a few listen

2001 Pewter WS6

iTrader: (43)

I understand but there are more and more people going with larger cid motors like myself. Bigger motors and bigger cams. I don't see many cams out there in the 240 range with less than .600 lift.

PREDATOR-Z

215 cc intake runner, not a head for big cubes. Maybe a 382/383...
And BTW if you just want to run a .620 lifts with those springs, you can; all you have to do is shim them.