Thread: 427 Build what do I need

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Thank you upfront for helping. I want to build a 427 for my 66 Chevelle. I would like 400 to 500 HP, but still use pump gas. I have a 427 tall deck marine block from a 75 truck, rated stock at 220HP, (apart) .40 over pistons (I may need to go .6 over)stock rods, stock crank, no cam. Heads are from a 73 454 with 113 cc heads,( heads rebuilt). I have nothing else.

Plan to use as a Sunday driver, carb over FI is Ok. Not looking to build a high dollar motor, but if I need good parts that's Ok too.

Thanks

again

cal

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.

My old prostock engine was a 427 tall deck but it wasn't in a production car---just for what it can do--stock steel 454 crank, 454 stock ch pistons, +.400 rods, alum c exhaust port heads, tunnel ram---ran 8.002/169.99----think it would have got in 7s but finished bigger motoer over that winter before we went racing the next year-- You would need spacers for intake manifold or special now available intake and a distributor with sliding base clamp-------

And I would not try to put one in an oem chassis---too tall, too wide(especially with modern day raised exhaust port heads

and its less than 1/2 taller at the valley--overall ht can be adjusted by the intake manifold--low, medium,hi riser

with custom length rods you can use stock ch pistons which saves enough money to buy the rods-----

[QUOTE=
And I would not try to put one in an oem chassis---too tall, too wide(especially with modern day raised exhaust port heads

and its less than 1/2 taller at the valley--overall ht can be adjusted by the intake manifold--low, medium,hi riser

with custom length rods you can use stock ch pistons which saves enough money to buy the rods-----[/QUOTE]

OK I will need a different block. Is the stock crank and rods still worth using in a different block. Also the heads are rebuilt from 73 corvette, 113 cc, 2.06/1.72 valves. Will the heads work with a standard 427.

thank you
cal

Originally Posted by HWORRELL

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.

all has been posted on this just look around on here as for the intake yes but are spacer plates of 400. but they make intakes that fit but not every one more intakes for big CID engines hi RPM s . then there many custom parts to get your 500 hp small engine with low CR far better to build a 9.800 deck block go as big as you can if there a buget. CID like a 496 not 427 tall deck and deal with things that will take way more time to fit then need for the same outcome with drop in parts on a 9.800 deck block

Originally Posted by pat mccarthy

....all has been posted on this just look around.

Pat, maybe it's "...all been posted.." before, but with all due respect to the forum owner the Search Engine on CHR sucks big time. It's all but impossible to find anything specific in the archives unless you're looking for posts by a specific member. The search options and key words don't support a selective process - if you ask for "bbc intake" you'll get inundated with every post that mentions "bbc", and then every post that has the word "intake". That's why we keep seeing repetitive questions, IMO.

Sorry for the rant, but seems to me Cal's just looking for a hand understanding his best path forward short of calling you for a quote on building his engine.

I really thank you guys for your help, and yes I did search the site as well as other sites and this has been the best, by the way where is Bay City. I have collected several cars over the years and now retired I want to work on them and build my first BB motor. I got the 427TD for dirt cheap, with overhauled 73 454 heads, but as I am finding out it was not the best thing to get for a chevelle. So I am trying to see what I can salvage from it and move on.

Info you guys take for granted is an education for me.

So Pat said earlier " 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 . "

Do both these builds use any of the parts I have, and if I did the first option is there and HP there?

thanks

cal

You could try an ad, maybe on your local Craigslist or other media to try to swap your tall deck for a standard deck block..... Never know what might turn up!

Originally Posted by rspears

Pat, maybe it's "...all been posted.." before, but with all due respect to the forum owner the Search Engine on CHR sucks big time. It's all but impossible to find anything specific in the archives unless you're looking for posts by a specific member. The search options and key words don't support a selective process - if you ask for "bbc intake" you'll get inundated with every post that mentions "bbc", and then every post that has the word "intake". That's why we keep seeing repetitive questions, IMO.

Sorry for the rant, but seems to me Cal's just looking for a hand understanding his best path forward short of calling you for a quote on building his engine.

SORRY I DID NOT KNOW HOW BAD IT SUCKS if he wants to call me to talk thats fine shop numbers all over the net and face book . i am not a bad guy as some think on here .i have some short blocks done or be happy to build him a lower buck 454 030 over as i have some stock crank s and some with more arm if he wants more CID