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APE valve spring retainers
are machined from aircraft quality titanium bar stock in the
APE plant on the latest state of the art computerized CNC machinery.CNC
machining allows us to offer such advantages as bored taper keeper
holes for exact keeper fit. Special gauging fixtures allow dimensions
to be held close to provide exact installed heights when assembling
the cylinder head.
The stock retainers for
the 'Busa are aluminum - not nearly as strong as titanium. Although
they seem to work fine in stock motors, as soon as you increase
the spring load above what the factory designed the stock retainers,
for you run the risk of pulling the valve keepers through the
aluminum retainer and dropping the valve in the motor. Also -
the bottom of the stock retainer will contact the valve stem
seal at about .380" cam lift. Removing material from the
bottom of the stock aluminum retainer will only further weaken
the stock retainer. APE retainers are .030 shorter than stock.
For cam lifts over .410" we recommend APE short valve guides.
TVSR1300-PRO - Set of
16 -- $229.95
NO MATTER WHO BUILDS YOUR CYLINDER HEAD, INSIST THAT THEY USE
APE TITANIUM RETAINERS.
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