Thread: 427 Build what do I need
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07-10-2013 05:19 AM #1
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
calLast edited by calxen61; 07-10-2013 at 05:49 AM. Reason: added info
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07-10-2013 06:39 AM #2
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.
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07-10-2013 07:00 AM #3
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 blockLast edited by pat mccarthy; 07-10-2013 at 07:05 AM.
Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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07-10-2013 07:18 AM #4
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.Roger
Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.
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07-10-2013 07:52 AM #5
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
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07-10-2013 03:24 PM #6
bay city is past flint north by about 40 miles my shop is in kawkawlin mi that 20 miles north of bay city . the deal is the deck is really not to tall aPontiac is 10.250 .olds is 10.625 all at one time GM did stuff them in a A body car But the 427 tall bbc was never in a car so work needs to be done and you need to run a bbc A body oil pan on any bbc has the cross over is close and the drag link inner tie rods will hit at full lock if not the right oil pan . things you can use out of the 427 tall deck .is the heads . the crank. the rods. timing cover . oil pump drive . head bolts ... but i buy new.. if you used all this and if you had a 396/402 block with 396/402 pistons would end up with a 9.800 deck engine all parts would bolt up to block and fit in the car with not much work if you had a 454 block and used all your parts with 427 .9.800 piston CH of 1.765 for the 3.760 crank you have you would have a 427 car engine..... the bore on a 454 block is 4.250 same as 454 .thats how you get a 427 from a454 . the 396/402 bore was smaller but cranks is still a 3.760 .. not many blocks could be bore to 4.250 bore so just better not think about it very few would take the over bore. you will see i never said a 427 9.800 car block and just told you to look for a 454 block the 427 car blocks are $$$$ less you in the right place at the right time realy do not need the427 9.800 block to build one better save it for the number restoration guys with deep pockets but even the older 454 blocks are of value to. bbc are not as cheap as SBC round here they always costed more for good coresLast edited by pat mccarthy; 07-10-2013 at 03:31 PM.
Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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07-10-2013 02:57 PM #7
SORRY I DID NOT KNOW HOW BAD IT SUCKSif 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
Last edited by pat mccarthy; 07-10-2013 at 02:59 PM.
Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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07-10-2013 03:25 PM #8
Roger
Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.
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08-12-2013 01:40 PM #9
PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.
I saw last night on fb about John. The world sure lost a great one. I'm going to miss his humor, advice, and perspective from another portion of the world. Rest in Peace Johnboy.
John Norton aka johnboy