Revised trickflow LS1 heads?
Thread Starter
Melting Slicks
Joined: Jan 2004
Posts: 2,746
Likes: 2
From: St. james NY
Revised trickflow LS1 heads?
Whats the deal with these revised trickflow heads. I see that they use diff pushrod lengths. Different head valve geometry? Why for the change?
I dont think mine are the revised heads... they use 7.70
I dont think mine are the revised heads... they use 7.70
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Are you saying the "revised" version uses standard pushrods lengths? There was a rumor circulating they were modifying them because the stock rockers didn't work and I think they were losing sales because people had to add in rocker arms to the cost of the heads and this effectively made them the most expensive head out there except possibly for the ETP's that required alternator bracket modifications. Longer pushrods can also lead to valve train instability with ETP being the prime example since their pushrods are over 8" long. With the benchmark being the AFR's that bolt right on and have a CARB number, I would understand if they revised them it would be to better compete in the market.
Last edited by vettenuts; Jul 25, 2007 at 06:44 AM.
Pro
Joined: Feb 2003
Posts: 623
Likes: 11
From: Ankeny IA
I have the revised heads. I'm not sure what was done. Just guessing, they probably changed the rocker positioning to accomodate different rocker/pushrod combos. They do still require roller rockers though.
Pro
Joined: Feb 2003
Posts: 623
Likes: 11
From: Ankeny IA
I didn't hear anything about using stock rockers. I posted a lengthy thread on LS1Tech about why these heads made no power over my previous ported 241 castings. The valvetrain geometry was where the experts seemed to think the problem was. In that thread everyone still cautioned against the stock rockers on these revised heads. In the end switching rockers did vastly improve the driving characteristics of the car, though I haven't dyno'd it to see where the power is at now.
7.5" is the correct pushrod length for heads milled to 61cc (which is common). On non milled heads you will need to measure or ask someone like TEA for the correct length.
7.5" is the correct pushrod length for heads milled to 61cc (which is common). On non milled heads you will need to measure or ask someone like TEA for the correct length.
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