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Don't have exhaust manifold bolts to put 2 1/2 inch ram horns on 327. Can I use grade 8 bolts or should I buy specific exhaust manifold bolts?

Fuzz
 

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I used Grade 8 bolts on my rebuild, 700 + miles on it and working great!
 

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Little reminder,once you get the bolts for the exh. manifold, use anti-seize on the threads and torque them to 25 ft.lbs. :anim_25::bowtier:
Big Bob:flag4::bowtieb:
 

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Used grade 8 bolts from Lowe's on my '57 with 2 1/2" inch ram horns on a 327........no issues at all. I bought my ram horns used for $40, they were in great shape. Didn't come with bolts or washers, though. Had them blasted and flat-planed........shot them with light gray VHT, works like a champ. No gaskets, just bolted them straight on. No issues.
 

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