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Old 12-09-2017, 10:00 PM
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ponyakr ponyakr is offline
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Join Date: Dec 2011
Location: North Louisiana
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"...the 428 will bolt in to a G body frame with the factory 301 mounts..."

Not without adapters. The 428's do not have motor mount holes in the correct locations.

https://butlerperformance.com/i-2445...tegory:1393557

"...don't know block/heads etc. Never been down this road..."

Don't buy a 500557 or 568557 casting number block. Don't buy heads with press-in rocker studs. By 1974 & later heads, such as #46, 5C, & 6X. They have screw-in studs & factory hardened valve seats, for unleaded gas. The 5C & 6X heads have larger 2.11 intake valves. The 6X heads are very popular on 455 engines, and are quite common. The '71-up D-port 455 heads have big combustion chambers & will not make enuff compression for a smaller engine. The '75-'76 6H 455 heads have 124cc chambers, and are especially low compression.


Last edited by ponyakr; 12-09-2017 at 10:25 PM.