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Hi guys. Having a 69 427 built for my car. It has the correct casting number for the year of the car but why is Hi-Perf truck cast in the block? Any gurus have any idea? Thanks
For what it’s worth, I just saw something on Motor Trend TV that recommended staying away from the 427 truck blocks. Issues with intake manifold/ head alignment along with others. Wish I would of payed more attention but it’s definitely something to look into.
@Northwoods79 the blocks you are referring to are the 366 and 427 industrial truck blocks. They have a 1/2" taller deck height than the standard big block. They were never installed by the factory in anything less than a ton and a half truck.
Drag racers and monster motor builders like them because the added deck height means a longer stroke crank can be used.
They're also known as "tall deck" blocks.
@Northwoods79 the blocks you are referring to are the 366 and 427 industrial truck blocks. They have a 1/2" taller deck height than the standard big block. They were never installed by the factory in anything less than a ton and a half truck.
Drag racers and monster motor builders like them because the added deck height means a longer stroke crank can be used.
They're also known as "tall deck" blocks.
Great information. How can someone identify these blocks so you know what your working with ?
Actually it's really easy. Look at the block deck right at spot where the top bolt is for the water pump. If it's close(like 3/8") you have a standard passenger/ light truck block. If your thumb fits in the space (I think 5/8" or so) you have a tall deck.
when I get home next week I can photograph these.
05-19-2021, 06:43 PM
69 427 block identification
