Lx5Liter is exactly right. You can (I have) use a non-HO cam with flat tappet lifters with no problems as long as you use the non-HO firing order with the cam (1-5-4-2-6-3-7-8). If you use the HO cam and roller lifters, then you'd use the HO firing order.
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Dave 88 GT - 13.4@106 on street tires (2.2 60ft)
My Stang
RHC member #75
My stang is FOR SALE!!
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