[DeTomaso] More valvetrain for 6143

[Tomas Gunnarsson]

Jack,

I think you're missing my point. Big block keepers are as you say 1/32" larger in ID but also somewhat (I don't have the figure but as an example, let's say they're 1/32" larger) larger in OD. The 351C 11/32" keepers have for some reason been given the big block OD to go with the small block valve stems. I have at the speed shop tried my stock keepers/valves with big block retainers and the keepers fit in those holes. They do not fit in normal aftermarket small block retainers. My aftermarket single groove keepers fit in the aftermarket retainers but not the stockers. Barry has confirmed my claims too.

Tomas
  ----- Original Message ----- 
  From: jderyke at aol.com 
  To: guson at home.se ; detomaso at realbig.com 
  Sent: Friday, January 22, 2010 4:35 AM
  Subject: Re: [DeTomaso] More valvetrain for 6143


  In a message dated 1/21/10 1:53:40 PM, guson at home.se writes:


    I was under the impression that the solution was to use Boss retainers with aftermarket keepers but if there are Boss keepers that fit the stock retainers I'd rather get that I guess. If these are stock Boss retainers they look nothing like mine anyway:


  You're right- in that article, the retainers pictured are not stock steel retainer washers. Stockers are the same for 260, 289, 302 and 351 engines, both Windsor & Cleveland. In the article, they say the valves were replaced with Pro Comp one-piece single-groove stainless valves, so I guess they also supplied the single groove keepers and aftermarket retainers.
  Big block keepers will be sized for 3/8" big block valve stems, so whether they're too big to fit 351C retainers or not is a moot point; big block valve stems won't fit in the 351-Cs' 11/32" valve guides. 429/460 stuff is very different even if the valve and port sizes are similar to the 4-V Cleveland.