The add and install instructions say they will fit my 57 Gen 1 Chevy 283 heads but they are 58 years old. I had to order 4 more longer screws. , as Gen 1 SBC heads do not use 4 standoffs. The short screws were ok. The chat line did it their way. I think I got extra screws as a result of the deal. You could save a lot of money and time by simply removing the 4 intermediate sizes and replacing them with 4 longer screws. The set will then fit pre 1958 Small Block Chevy V8. Would have given 5 stars if the websites hadn't said they would fit as is. The bolts fit well.
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