New TFS 245cc heads..Questions..
09-03-2007, 04:25 PM
#21
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I have 1 7/8 kooks on mine. Car pulls to 7700rpms if I let it. Bad thing is my 4l60e doesn`t like it and the valve train isn`t set-up to do that all the time. So I shift at 6800 right now! What comes in has to come out! 
09-05-2007, 10:46 PM
#23
The ET heads will work with stock rockers and their rocker stands, that is what I'm running myself
I didnn't buy the TFS 245's, because I remember Brian saying of a similar issue when using stock rockers with them.
09-06-2007, 07:16 AM
#24
Originally Posted by bifster
so let me get this right.... the LS& heads still flow more then these ported heads? what about portin an LS7 head what would happen then???
09-06-2007, 12:42 PM
#26
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I have heard/read about quite a few instaces where the ET's can NOT run stock rockers at all. You have to run aftermarkets..
As a matter of fact, the member "69TA" has a set of brand new ET265's for sale right now, and they came with Jesel rockers for this exact reason.
I was also speaking to someone yesterday and they said its the same problem with the TFS 235/245's. Can anyone "Confirm" this for a fact?
As a matter of fact, the member "69TA" has a set of brand new ET265's for sale right now, and they came with Jesel rockers for this exact reason.
I was also speaking to someone yesterday and they said its the same problem with the TFS 235/245's. Can anyone "Confirm" this for a fact?
Originally Posted by Jimmy P
No trying to hijack the thread..but how well did the stock rockers line up on the valve when you used the rockerstand(pedestal). I have a set of 240 ET heads,and using the stock rockers, the rocker arm tip barely touches the valve. After a full rotation, the contact patch covers about a third of the valve.
I didnn't buy the TFS 245's, because I remember Brian saying of a similar issue when using stock rockers with them.
I didnn't buy the TFS 245's, because I remember Brian saying of a similar issue when using stock rockers with them.
09-06-2007, 01:08 PM
#27
I have ET 225's and I had to shim the rocker stand up to get the stock rockers to work.
My car has seen 7800 rpms with no signs of valve float.
Ashley's car has ET 255's with stock rockers and hers has been over 8,000 rpms with no valve float.
I have yet to see a set of TFS do any better than ETP's or AFR's.
All 3 are very good heads .... its all in what you want.
My car has seen 7800 rpms with no signs of valve float.
Ashley's car has ET 255's with stock rockers and hers has been over 8,000 rpms with no valve float.
I have yet to see a set of TFS do any better than ETP's or AFR's.
All 3 are very good heads .... its all in what you want.
09-06-2007, 01:40 PM
#28
My valves and whatnot are perfect with stock rockers, and they were also shimmed slightly. I've had mine to 7600 with no problems, carries power right to it too.
With the 265's you have to run a differnt rocker I do believe, as well as a custom intake. But, if you need those heads, you're probably running all custom anyway.
With the 265's you have to run a differnt rocker I do believe, as well as a custom intake. But, if you need those heads, you're probably running all custom anyway.
09-07-2007, 01:42 PM
#30
Originally Posted by AMERICAN_HP
I was also speaking to someone yesterday and they said its the same problem with the TFS 235/245's. Can anyone "Confirm" this for a fact?
Last edited by Brian Tooley Racing; 09-07-2007 at 01:47 PM.
09-08-2007, 12:50 AM
#31
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Well......
I heard it from the horses mouth.. I ordered some new Yella Terra rockers today.
Thanks for the info.
I heard it from the horses mouth.. I ordered some new Yella Terra rockers today.
Thanks for the info.
Originally Posted by Brian Tooley
The first TFS heads that were released had geometry optimized for roller rockers and used 7.700” long pushrods, which made the head incompatible with stock rockers. TFS eventually changed their geometry to be like stock GM and now uses 7.500” long pushrods. TFS did a ton of durability testing and found that no matter what geometry was used that stock rockers caused considerable wear on bronze guides. So if you have a stock GM head, or an ET head, or an AFR head, and use stock rockers, they will eventually cause significant wear on the bronze guides. I know one other aftermarket head manufacturer knows about this problem but has not yet to post anything about it.
09-08-2007, 01:13 AM
#32
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Originally Posted by Brian Tooley
The first TFS heads that were released had geometry optimized for roller rockers and used 7.700” long pushrods, which made the head incompatible with stock rockers. TFS eventually changed their geometry to be like stock GM and now uses 7.500” long pushrods. TFS did a ton of durability testing and found that no matter what geometry was used that stock rockers caused considerable wear on bronze guides. So if you have a stock GM head, or an ET head, or an AFR head, and use stock rockers, they will eventually cause significant wear on the bronze guides. I know one other aftermarket head manufacturer knows about this problem but has not yet to post anything about it.
This is why I am going with yella terra light weight rockers with my setup.
09-08-2007, 05:50 AM
#34
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Originally Posted by Jimmy P
So basically, its a design flaw straight from GM. If we use stock rockers with the stock heads, we are going to cause significant wear on the broze guide?
How long till the wear is bad?
How long till the wear is bad?
i would like to know too-????
09-10-2007, 04:21 PM
#37
Originally Posted by Jimmy P
So basically, its a design flaw straight from GM. If we use stock rockers with the stock heads, we are going to cause significant wear on the broze guide?
How long till the wear is bad?
How long till the wear is bad?
If you put bronze guides in a GM head the guides will wear if you run over .550" lift, you will probably see wear within 10,000 miles, and you will eventully see oil consumption. It depends on what oil is used, how often it is changed, etc but it is just a matter of time before you see oil consumption with ANY head that uses bronze guides and stock rockers over .550" lift.