Tall Deck 427 ??? Any Good ???

[ibet55]

I'm not much of a mechanic, so I'll just ask a silly question. I found a complete tall deck 427 Chevrolet (suposedly it runs good) Anyway, are they worth anything, or are they boat anchors??? Thanks for any input. :?: :roll:

[Robert1320]

Make sure it is not a 366. The 366 is junk.

You can have some fun with the old 427.

[topsportsman1]

If thats an old truck engine I wouldn't use the pistons that are in it,they are the 4 ringed pistons,junk as far as I am concerned,the 4 ring pistons

[mcracecars]

as stated, tall deck 427s were/are truck blocks. Dont use the pistons and i seem to remember the head ports were quite small, but these blocks can make a nice street motor, or these days with all the goodies you can buy for them, an excellent race motor.
If what you found is indeed just a truck motor, then do not use it in stock form, it needs to be gone over...

[CHEVYMATT]

if it is a truck tall deck 427 then you can take and install a 4.25 stroke bbc crank and stock 454 pistons then run a 6.385 rod i think . hopefully someone will correct me if needed. a friend of mine built one with stock .30 over 454 pistons a 4.25 crank and either stock lenth rods or 6.385 rods and it worked great . it save him lots of cash to not have to buy 496 pistons. makes a nice 500 cube engine

[edvancedengines]

My opinion is that it is a great low cost base for a strong stroker engine. You can easily install a 4.250 stroke crank with not a lot of grinding. You can install a 4.375 crank with more grinding for clearances. Guys that are good have put 4.50 strokes in them but that is trickey to do.

You can use a 454 4.00 crank by grinding some and by using a set of 6.385 rods Corrected by DCarr. It is in fact the 6.535 rod. you can use a factory 454 piston.

That block is cpable of 427 - 433 - 440 - 452 - 454 - 461 - 477 - 482 - 496 - 509/510 - and up to 540 cu inches.

It was THE HARD CORE RACE block in the older days, before Dart, World etc. The block will handle a ton of hp with only minor block prep. I mean well over 1,000 hp and I have seen them live at 1,400 hp after they were fully prepped and filled.

Can you believe all the garbage I just wrote. I find it hard to believe too, but I have done it many times.

It is .400 taller than the standard block. iT was the first 10.200 block.

Ed

[dcarr511]

Are you guys sure its a 6.385 rod w/ stock piston and not a 6.535" ?

.400" taller deck would require a .400" longer rod ...........................

I recently ran one that was .125" over w/ 4.250 stroke

[edvancedengines]

Don,
You are correct. It is the .400 rod. I guess I am having brain fade.

Ed

[ultimatewarrior1]

I RUN A 427 TALL DECK IN MY MUDRACE TRUCK W/454 CRANK& PISTONS W/6.985 ALUM. RODS . THIS MOTOR IS A SCREAMER,IF I WAS YOU I WOULD GET THE MOTOR YOU CAN DO A LOT WITH THIS BLOCK. I ALSO WOULDN'T USE THE ORIGINAL HEADS ,USE SOME 990 HEADS OR SOME GOOD ALUM. HEADS.I'M USING AFR CNC HEADS AND HAVE NO COMPLAINTS.

[fastfisherman]

Make sure to buy the correct intake, one for a 10.2 tall deck block.

[buffjhsn1]

it's all i use! good old block from a dump truck. mine is .100 over (4.350) with a 4.25 stroke crank. this makes it a 505. i use 6.535 oliver rods in her. i have used these blocks for years and had no issues with them. i can't afford a "good block" :lol:

makes me feel good that my dump truck motor i put together in the back yard will run faster than a lot of guys "professionally built" pieces with the after market blocks :shock:

[Pwmax]

My buddy Bob Kisson, owner of Applied Dyno technology in Eagan,Mn, where I dyno all the engines I do, has found the limit of those blocks. He does a lot of alky tuning for many many tractor and truck pullers, alky funny cars, etc, that use injected alky, on serious blown big blocks, you know, 1500-2200+hp deals. He has a regular truck puller, that they found the limit of a truck block. It was about 1600hp, when it literaly ripped the deck surface off. Years ago, when like Ed said, basicaly all that was used, the 427 tall blocks, I know of a 4.750 crank that went in one. It worked. The motor was a total stone, with its mildly ported 990's, what were all botched, 640hp, and 670 ft/lbs, for a race gas 570. Totaly pathetic, lol. But, it ran. I personaly like the 4.375 shafts in them.

Frank
Advanced Performance
www.get-ap.com

[nekot]

Any body know the combo to make a 505ci with the 427 tall deck , and what part number to use , with SRP pistons or bigger,, i'm stuck with a 4.250 crank and 6.535 rods , any help would be nice.

[mytmouz]

Look 2 posts up from yours, buffjhsn1.

[nekot]

1st Question )Does anyone know if these blocks can be bored to a 4.500 bore , i'm aming to make a 540 ci with a 427 5-ton truck block machined downed to a 4.500 bore x 4.250 stroke with a 6.535 rod it should put me right to the top 540 ci any info would be great help
2nd question) Can i use a 502 piston in a 427 truck block bored to a 4.468 and a 4.250 crank or 4.500 with a 6.535 rod to give a 533ci or a 564ci.I had a friend pull my leg and he got 4.475 x 4.250 = 525 or 526 ci but i did not ask him what rod he used out of a 427 tall deck, i wonder how much of bore these blocks can take??????

[buffjhsn1]

if you fill the blocks, .140 is about the limit. you can put a 4.375 crank in them too and get more cubes that would make a 529, but you will hafta have custom pistons made as i don't think je stocks them that big. pretty sure they do at .125.

if you check je's website, or wiseco or whoever, they usually tell you the info that you need, bore size, rod length, stroke for the crank etc.