trick flow ls1 heads
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
Do a search. There's numerous threads with results of some tuners achieving over 500 RWHP on very streetable packages. I installed mine last fall, but had to redo the install because I used the stock rocker arms, and damaged the valve tips. It's now known that these heads will require the add'l purchase of roller rocker arms. Other than this drawback, they perform exceptionally well.
Instructor
Joined: Apr 2005
Posts: 144
Likes: 0
From: Woodlands TX
Do a search. There's numerous threads with results of some tuners achieving over 500 RWHP on very streetable packages. I installed mine last fall, but had to redo the install because I used the stock rocker arms, and damaged the valve tips. It's now known that these heads will require the add'l purchase of roller rocker arms. Other than this drawback, they perform exceptionally well.
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
Uh, I already gave you the reason. The stock rockers will wear cups in the valve tips, and would eventually lead to a dropped valve. This is not as big a deal as it seems, because the stock rockers are prone to failure anyway, and it'd be a shame to build a nice high performance motor, and have it eat a bunch of those little roller bearings that the stock rockers have a tendency to crap out.
Burning Brakes
Joined: Feb 2006
Posts: 917
Likes: 0
From: 10.54 @ 129 346 N/A A4 Record 9.78 @ 139+ on 150 shot
