These are the STOCK retainers for a STOCK 5.0 cylinder head. They should NOT!!! be used on a TFS head. They were just barely good enough for a STOCK application. Not to be used in a real performance setting. Not to be used with a spring that is stiffer than a STOCK spring. DO NOT USE!!! Call Trick Flow or get a hold of a vender of Trick Flow cylinder heads and they will get you the right retainer for your application.
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No matter how much you spend, or how much you prepare, there is ALWAYS someone else faster or quicker than YOU!!!!!!!!!!
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