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Because they aren't stock rockers. Even if they are stock replacement, it's not the same. That would account for the grinding some people are having to do. Which is pretty common with aftermarket rockers anyway.
Also, if you look at T&D or Crower products for the LS3, they do show the offset as different on the intake side between the GM LS3 and TFS LS3. Point is, the TFS LS3 head is not stock either.
In that thread, neither company had actually tested it. It's a known practice that you're an R&D guinea pig for everything you buy--especially low volume custom stuff. If somebody is having issues with something, it's probably the first time anybody has heard of it. And this isn't a bash on any vendor. But this is common knowledge for this type of stuff. It's just the way hot rodding works. They don't have the time or resources or financial investment to test all combinations.
I'm just stating that other rockers typically have a different part number for TFS heads as the offset is usually slightly different from a GM casting. Take it for what it's worth.
In that thread, neither company had actually tested it. It's a known practice that you're an R&D guinea pig for everything you buy--especially low volume custom stuff. If somebody is having issues with something, it's probably the first time anybody has heard of it. And this isn't a bash on any vendor. But this is common knowledge for this type of stuff. It's just the way hot rodding works. They don't have the time or resources or financial investment to test all combinations.
I'm just stating that other rockers typically have a different part number for TFS heads as the offset is usually slightly different from a GM casting. Take it for what it's worth.
Ehh.... I've not seen nor heard of any issues with them.
I've run them in my daily driven 2010 SS with no issues for over 10k miles, so all is good as far as I'm concerned.
Is the valve tip wipe pattern less critical with these than with stock rockers? I was kind of amazed that thunderstruck507 managed to get both lash and wipe correct with solid lifters and using shims to adjust stock rockers... so I wonder if you could use these with solid lifters, use shims to dial in the lash, and not worry much about the tip wipe. Or would that just be asking for trouble?
I've got them in my SBE LS2 with TFS225's & G6X3. they work great.
What is the part number on them TSP rockers? What kind of push rods are you running?
I was thinking of pairing these rocker arms with some .660" BTR springs and Morel 5206 linkbar lifters in those TFS225's. LQ9 408 with an S485 turbo. BTR 3 cam or custom grind.
I know you need rocker arm pedestals 12552203 with stock GM rockers W0133-1763277 but I'm told these won't work with TFS225 heads. Do the TSP rockers come with everything needed?
I'm shooting for 10:1 compression. Can go 61cc with 20cc dish pistons or 64cc with 15 dish pistons, but I think the 64cc are factory casting on these heads?
What is the part number on them TSP rockers? What kind of push rods are you running?
I was thinking of pairing these rocker arms with some .660" BTR springs and Morel 5206 linkbar lifters in those TFS225's. LQ9 408 with an S485 turbo. BTR 3 cam or custom grind.
I know you need rocker arm pedestals 12552203 with stock GM rockers W0133-1763277 but I'm told these won't work with TFS225 heads. Do the TSP rockers come with everything needed?
I'm shooting for 10:1 compression. Can go 61cc with 20cc dish pistons or 64cc with 15 dish pistons, but I think the 64cc are factory casting on these heads?
Here's the part number on the rockers:
25-TSP172RR-CATH-CHE - Texas Speed & Perfromance Steel 1.72 Ratio Roller Rocker Package With CHE Bushings for Cathedral Port Cylinder Heads
I also used manton 11/32 pushrods, and morel link-bars. I used the stock LS2 rocker pedestals with the tabs removed. We milled the heads to 61cc and used .040 cometics... I did not need to fly-cut. These heads are/were 64cc stock, if I recall correctly. My TFS 225's are using the stock valves, and bronze guides, with upgraded springs and titanium retainers.
More pics of TSP Steele Roller Tips (in Darton Sleeved Forged 427ci etc)
I’m nearing first run of new 427ci using my PRC heads with Fuuuul work done - the slight variation in rocker ratio was considered during parts list to include cam specs and valve events / timing...
Soldiered up in a row... on top of PAC polished springs, fancy valves, PRC work, etc...
Last edited by MUL8NO1; 09-19-2018 at 09:31 PM.
Reason: Trying to add pics for you all...
This was the caption on the picture; "Some 3d printed prototypes we use to help us out through some of the later stages of development! Next stop finished product!"
This was the caption on the picture; "Some 3d printed prototypes we use to help us out through some of the later stages of development! Next stop finished product!"
Thanks! The caption didn't make the cut to here, I guess..
08-26-2018, 07:37 PM
