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  #1  
Old Jan 8th, 10, 09:48 AM
jostby jostby is offline
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jeff
 
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Question can someone explain tall vs short deck BBC?

I've been reading up on the Big Blocks but haven't found good referance to what the differance between the two are (other than deck height).
Is one a smog motor? Do the two use a differant stroke? One a farm truck block vs performance?
Thanks,
Jeff.
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  #2  
Old Jan 8th, 10, 12:37 PM
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Default Re: can someone explain tall vs short deck BBC?

Quote:
Originally Posted by jostby View Post
I've been reading up on the Big Blocks but haven't found good referance to what the differance between the two are (other than deck height).
Is one a smog motor? Do the two use a differant stroke? One a farm truck block vs performance?
Thanks,
Jeff.
Tall block BB's are sometimes categorized as "industrial" engines.This stems from the fact that they were mainly used in heavy duty trucks suitable for farm and/or fleet type work. Although their original intent is more "pedestrian" in nature....they can be built to performance standards. Performance parts can be obtained but header fitment and hood clearance becomes an issue when installing the tall deck in our beloved Camaros.

David F.
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Old Jan 8th, 10, 02:44 PM
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Default Re: can someone explain tall vs short deck BBC?

The easiest visual inspection of the difference between tall block and short block is to look at the water pump-to-cylinder head deck.

Short deck engines, the top of the w/pump bolt to the block is at the deck.
Tall deck blocks have the deck 3/4 inch higher than the top of the w/pump.
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Old Jan 8th, 10, 03:18 PM
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Quote:
Originally Posted by jostby View Post
... what the differance between the two are (other than deck height).
... Do the two use a differant stroke?
... One a farm truck block vs performance?
Thanks,
Jeff.
As stated, they were originally a truck application to allow the use of a different piston-ring package with additional ring.
- Tall deck blocks use a special intake manifold and distributor to allow for the additional height. Other than that many parts can be the same as a standard deck.
- The 'stroke' of a standard and a 'tall-deck' 427 are the same, only difference is the piston.
- Although they are/were engineered to increase engine cycle life for industrial/HD truck applications, they are also used in some factory HP applications - like the 700HP 572 Big-blocks
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Old Jan 8th, 10, 04:14 PM
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Old Jan 8th, 10, 04:22 PM
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Default Re: can someone explain tall vs short deck BBC?

Thanks for the pics illustrating the different waterpump mounting locations.


David F.
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Old Jan 8th, 10, 06:21 PM
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Default Re: can someone explain tall vs short deck BBC?

Quote:
Originally Posted by jostby View Post
I've been reading up on the Big Blocks but haven't found good referance to what the differance between the two are (other than deck height).
Is one a smog motor? Do the two use a differant stroke? One a farm truck block vs performance?
Thanks,
Jeff.
Typical oem passenger blocks circa 60,70,s measured 396/402/427/454.
The T engine(tall deck) 366/427.
All these engines shared the 3.76 stroke aside from the 4" 454 passenger.
The .400" increase in deck height with T engines allowed a 3rd compression ring to be used for heavy duty applications.
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Old Jan 9th, 10, 02:25 PM
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Default Re: can someone explain tall vs short deck BBC?

I had a TD427 irrigation engine block. It had OEM gear driven cam, block was drilled for thrustwasher plate retention. That would be a quick way to spot one if you were just eyeballing bare blocks.

The 366 had main cap side tie bolts iirc. 427TD didn't.
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Old Jan 9th, 10, 05:35 PM
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Quote:
Originally Posted by 77wolf10.85 View Post
I had a TD427 irrigation engine block. It had OEM gear driven cam, block was drilled for thrustwasher plate retention. That would be a quick way to spot one if you were just eyeballing bare blocks.

The 366 had main cap side tie bolts iirc. 427TD didn't.
If it had the gear drive and the trust plate then it was a Counter-Rotation unit
Very common set-up for them as well as Marine units.
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Old Jan 9th, 10, 06:54 PM
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Default Re: can someone explain tall vs short deck BBC?

A quich visual on the difference,The standard deck is flush with the top of the water pump.With a tall deck the distance between the top of the water pump and the deck will be about the same as the thickness of a 3/8" bolt.

With modern "3D" profiled steel connecting rods,you can probably squeeze a 4.5" stroke crank into a 427 tall deck truck block.The tall deck 427 isnt notoriously thick like some earlier engines,so it isnt a given that it will bore out to .125" over,but if you did bore that much,you could have a really big engine based on a cheap truck block.I use 3D rods in a regular 454 block with a 4.25" crank and have tons of room,so with minimal grinding I could see another 1/4 inch of stroke going in.If you tried to get a 4.5" crank in a low deck,the rods might not hit,but the pistons would have to be too short to actually work,thats were the tall deck steps in.

On a lighter note,I have seen some of the "inner city" type racers use them "4 ring boat anchor" 366 truck engines with multiple kits of nitrous to make crazy power with junkyard parts.I have seen these guys take a school bus engine out of the junkyard,put an aluminum ravcngi ntake and 3 nitrous plates on it,cram it into a gutted out Malibu or Cutlass or whatever and make a lot of money off of unsuspecting victims,and the engines last forever.
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  #11  
Old Jan 10th, 10, 05:35 PM
jostby jostby is offline
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Default Re: can someone explain tall vs short deck BBC?

Thanks guys, all excellent answers with interesting tidbits of info

I shall wonder no more!!

Jeff.
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