Unless I'm misunderstanding the issue, both the POP and the T&D aluminum rocker stands work just fine.
Precision Oil Pumps does not make any form of an end support stand for the H.R.; at one time he was attempting engineering that utilized the cylinder head retention bolt but has surrendered further efforts thus far.
T & D claims to be making a rocker arm/shaft/stand system (components not being interchangeable with anything else) so although it might be a "bolt-on" it's not just a matter of acquiring some end-stands and popping them on.
The only concern I have with the T & D product, as I have not used this system (Part #7024 for the H.R.), is that as described to me these stands place the shaft center-line at something of about .450" +/- (T & D refrained from providing exact measurements
) higher than the O.E. production units!
So how does one move the rocker arm pivot trunnion up that much, this with as stated by T & D "intended for stock-length valves" and end up with something reasonably correct in geometry? I have done a few H.R.'s and have not noted in these instances and in my perspective that Ford Motor Co. had mispositioned the shafts that greatly? With insistent inquiry of T & D, the final statement was "We know what we are doing, with great study we move the fulcrum lengths and trunnion positions until we establish the ideal geometry for each application, after all we are..................." And of course the "We've sold hundreds of these (for H.R.'s?
) and nobody else complained"! And with greater effort on my part for an understanding of how this was accomplished including perhaps some specific dimensional values of the stands, suggesting perhaps even simply e-mail me an engineering print (many manufactures over the years have done this) so perhaps I could better understand the execution, I was told: 'We don't send out prints anymore"; "to many knock-off efforts encountered"
, and "we don't just spell-out such values over the phone either"; "because I (T & D) don't have that information in front of me
". And then: "you just need to have 'faith' in the fact that we know what we're doing" and .............................. "your just way 'over-thinking' this"!
I don't generally feel that 'leaps-of-faith' should be mixed with practical mechanical engineering discussions.
So, as I have not utilized this product (I have used T & D products on other engine applications; and they still sell S.B.C. rockers for the S.B.F. applications even though we have repeatedly explained it 'is less than ideal'
) has anyone here worked with this T & D system; and is/was it as has been described to me dimensionally; and did it 'work-out'.............O.K.?
Scott.
