Decking the 400
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More Turbo
Joined: Feb 2019
Posts: 563
Likes: 4
From: Wolfsburg
Decking the 400
How unorthodox is it to deck the block to achieve a good piston to deck distance? Also how much can safely be taken off a 400 block? Are there any drawbacks to decking more? I am aware of the need to also machine the intake manifold.
just trying to look at all available options.
Thanks in Advance
just trying to look at all available options.
Thanks in Advance
Cargo Master
Joined: Oct 2020
Posts: 2,657
Likes: 777
You could deck the block as much as you want really. The only drawbacks are like you say possible manifold fit problems as well as changing the preload in the valvetrain. From what I've seen factories don't control deck height all that closely and some blocks might be significantly taller than other ones. If you cut too far you'd have to use a gasket from Cometic to jack the heads back up again.
More Turbo
Joined: Sep 2003
Posts: 514
Likes: 27
Decking the block to get the deck square with the crank centerline and at 90 degrees from the other deck is a great idea.
Detroit machine work wasn't intended for race engines, rather for grocery getters and family vacation haulers.
Decking the block to get the piston closer to the deck will cost you surprising amounts of money, unless you own the shop.
I'd suggest keeping the stock or blueprint deck and spending the $$$ on Tim Meyer's pistons. UNLESS YOU ARE INSTALLING CLOSED CHAMBER HEADS!
R.
Detroit machine work wasn't intended for race engines, rather for grocery getters and family vacation haulers.
Decking the block to get the piston closer to the deck will cost you surprising amounts of money, unless you own the shop.
I'd suggest keeping the stock or blueprint deck and spending the $$$ on Tim Meyer's pistons. UNLESS YOU ARE INSTALLING CLOSED CHAMBER HEADS!
R.
Cargo Master
Joined: Oct 2020
Posts: 2,657
Likes: 777
Decking the block to get the deck square with the crank centerline and at 90 degrees from the other deck is a great idea.
Detroit machine work wasn't intended for race engines, rather for grocery getters and family vacation haulers.
Decking the block to get the piston closer to the deck will cost you surprising amounts of money, unless you own the shop.
I'd suggest keeping the stock or blueprint deck and spending the $$$ on Tim Meyer's pistons. UNLESS YOU ARE INSTALLING CLOSED CHAMBER HEADS!
R.
Detroit machine work wasn't intended for race engines, rather for grocery getters and family vacation haulers.
Decking the block to get the piston closer to the deck will cost you surprising amounts of money, unless you own the shop.
I'd suggest keeping the stock or blueprint deck and spending the $$$ on Tim Meyer's pistons. UNLESS YOU ARE INSTALLING CLOSED CHAMBER HEADS!
R.
Hotshot
Joined: Jul 2020
Posts: 10,363
Likes: 2,595
From: Near Salt Lake City
A good machinist is always going to want to deck the block about 10 thou at least
If you go much more than that is when you run into manifold bolts not fitting and lifter preload being incorrect
The lifter plunger will no longer be in the center of the bore
Do it
More compression
More power
If you go much more than that is when you run into manifold bolts not fitting and lifter preload being incorrect
The lifter plunger will no longer be in the center of the bore
Do it
More compression
More power
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