Thread: 427 Build what do I need

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the talldeck 10.200 block is not a drop in .if you only staying at 500 hp and only 427 getting the enging to fit is not worth the work . there two ways to go with this build up take all parts less pistons use a 454 block and build a 427 out of it . or start build with a 9.800 deck block with Gm 454 block you can get to 512 cid with out much work built many of the 489 to510 . i have done many of the 10.200 tall decks but we start at 572to 632 cid then it,s worth the work for things to fit .

Ok 1. Not sure what you mean by "not a drop in" 2. Can I get more than 500 hp with this, then is worth the work. 3. Is this block even worth messing with. Is it worthless?
Thanks
Cal

Originally Posted by calxen61

Ok 1. Not sure what you mean by "not a drop in" 2. Can I get more than 500 hp with this, then is worth the work. 3. Is this block even worth messing with. Is it worthless?
Thanks
Cal

well you can get 500 hp with a 454 or just about any 9.800 deck block and headers will fit and other things . i put tall deck blocks in both of my 66 GtO.s over the years.572s and 632 many 9.800 blocks from 396 to 548s i know what it takes to stick one in. know abit about bbc and getting 500hp out of a bone stock bottom end 427 tall deck will take some work on pump gas . i am building two 10.200blocks for some one that wants a street strip engine. this started life as a 427 tall deck it is now a 540 as the car its a Gm A body so he went threw the cost of getting custom headers so he has all out race only 598 tall deck i am building or may get on the street if things get to hot and the 540 can not get the job done . i am doing the same thing right now i have my donovan alumiun 632 10.5 cr engine just for the street .my race engine is a 598 14to1 roller engine so car is set up for a easy swap .thats is why i sold my 735 cid just to much work getting it to fit the old A body gm frame. just what i have now i had to do frame and front cross member work streering work to get a good oil pan to fit in the car. to swing the big crank and big header tubes. i done just about every thing you can do to a A body Gm car with both GtOs i had over 30 years

I get it now the tall deck phiscally will not fit in a chevelle and therefor a run of of the mill 454 will be better. Thats too bad cuz the tall deck was free.what can I do with it.

Thanks
Cal

Originally Posted by calxen61

I get it now the tall deck phiscally will not fit in a chevelle and therefor a run of of the mill 454 will be better. Thats too bad cuz the tall deck was free.what can I do with it.

Thanks
Cal

it can be done it,s just not a easy way to go .your block can stroked to 525 cid easy and build it but the the same can be done with the 454 can be built to 496 the bigger you go it is by far better if you looking for big power on pump gas

well I am getting an education on a tall block. I am retired now so I can play with my cars. I have build small blocks years ago but never a BB tall deck.

So the real problem is we can build the tall block but because of the tall deck stock or aftermarket headers don't fit. Does the 427 or 454 oil pan fit? Also I imagine intakes, distributer, are all different and weight must be more now that I think about it. What other issues does a tall deck create?

thanks again

cal

Originally Posted by calxen61

well I am getting an education on a tall block. I am retired now so I can play with my cars. I have build small blocks years ago but never a BB tall deck.

So the real problem is we can build the tall block but because of the tall deck stock or aftermarket headers don't fit. Does the 427 or 454 oil pan fit? Also I imagine intakes, distributer, are all different and weight must be more now that I think about it. What other issues does a tall deck create?

thanks again

cal

Because of the extra height of the block it will not clear the hood, it has to use custom headers, to get it low enough in the car the cross member and engine mountings must be modified which creates ground clearance issues. Tall decks can be used to make big inches but not worth the expense & trouble for a street car. You also have to consider that you will have to have custom long length rods and custom pistons and standard big block intake manifolds will not work without 1/2 inch spacer plates on each side.