Here is an ad from 1981-1983 for HKS Camshafts which is an after market distributor of performance products. Depending on popularity, limited numbers of that particular series were sold or a hidden treasure if found in any vehicle that had been modified during the 3TG's limited production run. The Unicorn cam series.
This information was new then and may or may not apply to todays performance standards. Remember that the 2tg camshafts fit that particular head, except for the distributor drive gear. Cams can be re-ground to what ever duration the user request.
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