You have early Twisted Wedge heads that were beset w/all kinds of problems.
that's why the factory used to convert them to stud mount free of charge. Summit
owns them now, so maybe there's where the $100 comes from. I'm also told that
the twisted geometry puts stress on the valve train, & the early heads used
cheap valve train parts which wore prematurely. Steel valve guides were
particularly stressed. The Mustang tech boards are full of this discussion, and
can provide detail. That's what scared me away and convinced me to buy
Edelbrocks, which have a reputation for quality. TW heads do provide lots more
HP than most of the other streetable heads, including Edelbrock, tho. By the
time you pay for stud-mounted rockers, you'll void the bargain price. And stock
length pushrods will NOT fit, so budget for them too. Be sure and check all the
threads on used heads, before mounting them, because they commonly strip out of
the aluminum. They can be drilled out and helicoiled. Try the www.corral.net 5.0
tech board for more info.
Al J.
"Ronak, TP (Timothy)" wrote:
> Listers,
> As I have said already I have managed to get some TFS Twisted Wedge Heads
> from Theo (Theo gave my Wife a great deal and I got them for my Birthday ;>)
> ). I am going to be putting them on a 350 C.I. - 1990 5.0 motor (The Lunati
> EA31 Kit best price quoted yet is $3300 in Canadian dollars from Guyon
> Racing). I have found out some rather interesting information about the
> suitability of these heads for performance applications.
> In contact with TFS I learned that the type of head that I have (Pedestal
> mounted Rocker Arms as per Stock) are not suitable to performance cam usage.
> In fact I was told that it is necessary to convert my heads to stud mount
> and I need to send them my heads and have them drilled and tapped by them to
> ensure that the geometry is correct as there is a compound angle to deal
> with. They are very accommodating in this and only want to charge $100 US
> and they include guide-plates.
> Apparently the heads work fine with stock cams and stock applications but if
> you move to a higher than stock lift cam you need to be aware that the head
> "MAY" cause side loading of the valve causing the valve tip and guide to
> fail prematurely. This is especially true if you use non-roller tip rockers
> and incorrect length pushrods.
> As far as I can tell it looks as though they are the ones to run and I am
> really looking forward to getting all of the bits together.
>
> Any Listers want to comment on what hydraulic roller cam I should run with a
> carburetor in the 350?
> Anyone want to comment on the cam to run in case I don't run the Lunati kit
> and wind up building the 302?
>
> Best Regards,
> Tim Ronak
> B382000680
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