What is the differrence between a 427 chevy bb and a 427 chevy tall deck - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-25-2005, 07:42 PM
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What is the differrence between a 427 chevy bb and a 427 chevy tall deck

As far as i know both had the same bore and stroke (4.250" x 3.76") but did the taller deck cause a lesser compression ratio than the regular 427 big block? Are there any other differrences? thanks bf

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Old 04-25-2005, 08:02 PM
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they were truck motors if I'm not mistaken. Most guys get them and just hack them down to normal deck height.

K
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Old 04-25-2005, 08:34 PM
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The compression was less mainly because it was a truck engine (burned cheaper fuel)... But also the deck was .400 taller which allowed for a 3rd compression ring on a of course taller piston... The trick to use this block in an HP application is to use a longer rod (hence a 6.535) to allow for better rod angles but also their are combinations of a longer stroke and shorter rod to make the difference... The most common combo comes out at 540 cui but the larger bore with the longer stroke in aftermarket blocks and later Gen 6 blocks was found to be the real HP makers...


Primary difference is the deck height which is .400 more than a std. deck BBC
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Old 04-26-2005, 09:19 AM
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Quote:
Originally Posted by killerformula
they were truck motors if I'm not mistaken. Most guys get them and just hack them down to normal deck height.

K
Killer they cannot be milled the .400" needed to make them the 9.8" standard height. The deck is not thick enough.....

Brian12c

The big problem with the tall decks is all the problems with intakes, headers, distributors. etc....... They are just not a good combo to start with...

Don't believe all the hyp about longer rods giving more HP, It really does not work that way.....Plus then you have all that extra bob weight swining around in there......The extra deck height messes up the intake runner shot at the valve and there is more power there to be lost then gained by a longer rod.......

Keith
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Old 04-26-2005, 01:46 PM
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Quote:
Originally Posted by k-star
Killer they cannot be milled the .400" needed to make them the 9.8" standard height. The deck is not thick enough.....

Oops, my bad. I was certain I read that, but who knows with all the deck chopping and head milling folks do. Probably heard it about some other motor!

K
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Old 04-26-2005, 01:53 PM
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No problem..... I got your back brother!!!!!!

Keith
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Old 04-26-2005, 02:35 PM
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Just send that block to uncle Marks machine shop/cabinet shop and I"ll run that bad boy through my new sander!
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Old 01-22-2006, 08:01 PM
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427 tall block

is the heads and crank the same as a car motor
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Old 01-22-2006, 09:34 PM
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The crank is the same, but the heads are different. They can be identified by the word "TRUCK" cast on the bottom of the runners. If I remember correctly the chambers and the valves are different.
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Old 01-29-2007, 08:54 AM
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427 Tall

I have a 427 Tall Deck, 4.290 bore & 3.760 stroke. 13 to 1 comp, comp cam 629 / 605. Holley Intake & 454 car heads. oval from 68-69 ported, 1000 cmf carb, had to buy spacers for the intake. has Steel crank. steel rods. puts out a guess 700 hp........runs 5.7s in the 1 8th mile Texas Weather!
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Old 01-29-2007, 09:42 AM
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Quote:
Originally Posted by Keith817
I have a 427 Tall Deck, 4.290 bore & 3.760 stroke. 13 to 1 comp, comp cam 629 / 605. Holley Intake & 454 car heads. oval from 68-69 ported, 1000 cmf carb, had to buy spacers for the intake. has Steel crank. steel rods. puts out a guess 700 hp........runs 5.7s in the 1 8th mile Texas Weather!
i had heard you can get 500+ hp out of a tall deck 427. i guess there worth doing something with afterall. never really knew for sure though.
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Old 01-29-2007, 09:58 AM
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I think stock hp w/ peanut heads & 2 bbl was 260 w/ A hell of TQ like 400 lbs
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