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Old 12-04-2005, 04:09 PM
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tall deck motor question

Does anybody know what is the maximum bored on a 427 tall deck motor?

I know marine block can be bored up to 125 thousand and have still have thick cylinder wall. But does it the same thing on a 427 bbc tall deck?

What will be the best bored without any overheating problem with a block like that. Any advice.

Stephane

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Old 12-04-2005, 04:39 PM
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The only way to be sure what a block can be bored is by sonic testing the cylinder walls. From my experience, the older 427 TD blocks do have a bit thicker cylinder walls. An over bore of .100 should be no problem and .125 should be possible. I have done both. I prefer boring .100 because this leaves additional material in case you have a failure of some type you can bore again without finding another block. I hope this helps.
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Old 12-04-2005, 04:42 PM
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They will vary...from block to block......Sonic testing is the best bet.

I bored mine 90 thousands.....years ago.
The tall deck creates a whole new series of issues..as they are .440 taller decks. This messes up the intake/head fit. I made a set of spacer plates.....( I was in the tool and die business then )...but now they are available over the counter. Push rods are another issue.......and the distributor....

Back then..it was about the only way to get big inch displacement.... NOW......no problem ...GM sells better and bigger stuff now.....

.
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Old 12-04-2005, 07:45 PM
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Quote:
Originally Posted by Deuce
They will vary...from block to block......Sonic testing is the best bet.

I bored mine 90 thousands.....years ago.
The tall deck creates a whole new series of issues..as they are .440 taller decks. This messes up the intake/head fit. I made a set of spacer plates.....( I was in the tool and die business then )...but now they are available over the counter. Push rods are another issue.......and the distributor....

Back then..it was about the only way to get big inch displacement.... NOW......no problem ...GM sells better and bigger stuff now.....

.
What is the total lenght of a stock rod from a tall deck? ...Do you think it will be better to upgrade a tall deck motor for high performance street and drag race applicaton, I mean...with the rod ratio, 4.250 crank and 100 thousand overbored, and a big cam and aluminum head...what HP I can expect from a 11.0:1 cr motor, around what???

Stephane
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Old 12-04-2005, 07:52 PM
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Rod length is the same as all other 366-454 engines. The extra deck height is from the piston having 4 ring lands.
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Old 12-05-2005, 02:06 PM
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Originally Posted by BOBCRMAN@aol.com
Rod length is the same as all other 366-454 engines. The extra deck height is from the piston having 4 ring lands.
So it's mean that the piston is taller than a 454 stock piston?

This piston have 6.135 Rod?

Or the piston pin are lower to compense the deck?

A normal piston have 3 ring, and this tall deck have 4, sorry I dont understand!
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Old 12-05-2005, 02:25 PM
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The distance from the pin center to the crown is the compression height. You can increase the compression height to make up for deck height's but he piston get's heavier.
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