cheap 427
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Instructor
Joined: May 2004
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From: Fort Drum New York
cheap 427
Stupid question time. I am looking for an internally balanced BBC. I don’t care about any numbers matching anything. Is a 454 block the same as a 427? I can get the rotating assembly after market, just wonder where I can find a cheap BBC core. (Cheap is relative I know) Thanks for any advice. Oh and......
I’m back in the states!!!!!!!!!!
Isky
I’m back in the states!!!!!!!!!!
Isky
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Real cheap can be a 366 truck crank, stock rods and some decent forged pistons. Do a balance job and you're in business.
If you are going to buy an aftermarket rotating assy, I'd get a 4.250 crank and make a 489 or a 496 out of it. They rev 7000 rpm too!
JIM
If you are going to buy an aftermarket rotating assy, I'd get a 4.250 crank and make a 489 or a 496 out of it. They rev 7000 rpm too!
JIM
Melting Slicks
Joined: Nov 2003
Posts: 2,362
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From: San Antonio TX
Originally Posted by VetteLS6
not to steal this thread, but does anyone have experience with a short stroke BBC?....I mean like 3.5" or less?
Larry
Larry
Yes on Short Stroke Big Blocks but why in this day and age?
They were popular in some forms of drag racing 20 or more years ago. Had to do with weight VS displacement. Also the fact that even if it was small in CI with the heads and other components you would rev them to the moon of say 9 to 9500rpm since they had the heads that with that displacement would flow like crazy at that time. But then again gas porting pistons and knife edging cranks along with other things that were done along with Turbo Clutches are things of the past and was just a nitch at the time.
Not something you should even think about doing for a street car. But that is just MHO.
In this day and age you want as many CI as you can get. One is you can run lower compression to be able to run pump fuel. Also with the increased CI you do not need to run the high rpm's to get power from the power plant thus the engine will live a much longer and happier life.
It is possible and relatively cheap to build a 550HP plus 454 with not much more than a few modified stock GM components.
Last edited by SHAKERATTLEROLL; Jul 27, 2006 at 02:00 AM.
Race Director
Joined: Jan 2000
Posts: 13,017
Likes: 2,261
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
There's a lot of folks using 4.500 and 4.600 bores with 3.76 strokes these days...but it's mainly in classes where you have a cubic inch/weight restriction. They build as many cubes as they can and then spin it to the moon. The ones I know of are in the 9000+ rpm range.
I do know of one of the above type motors in a street Vette. 8100 rpm at peak HP (840) and 8600 rpm shift points. This takes titanium valves, killer rollers etc etc. But he does run low 9's/high 140'smph in the 1/4 with no power adders! RPM is fun!!
In the early 80's they used to build the destrokers for Pro Stock. They used 348 cranks out of the old "W" motors I believe. Apparently they can go in without too much extra machine work.
Just how high do you want to rev?
JIM
I do know of one of the above type motors in a street Vette. 8100 rpm at peak HP (840) and 8600 rpm shift points. This takes titanium valves, killer rollers etc etc. But he does run low 9's/high 140'smph in the 1/4 with no power adders! RPM is fun!!
In the early 80's they used to build the destrokers for Pro Stock. They used 348 cranks out of the old "W" motors I believe. Apparently they can go in without too much extra machine work.
Just how high do you want to rev?
JIM
Instructor
Joined: Dec 2002
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From: Leander TX
Originally Posted by Iskenderian
Stupid question time. I am looking for an internally balanced BBC. I don’t care about any numbers matching anything. Is a 454 block the same as a 427? I can get the rotating assembly after market, just wonder where I can find a cheap BBC core. (Cheap is relative I know) Thanks for any advice. Oh and......
-Frank
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
To answer your question, a 454 and 427 share the same block. 366/396/402/427 share a crankshaft.
I have a 74 2-bolt 454 from a pickup. Apart, but complete long-block (forgot-I lost the rods when I moved). What's it worth? Standard bore, should easily go .030, timing chain broke and bent some valves. I have had it since '92. I also have a standard 427 steel crank to go with it.
I have a 74 2-bolt 454 from a pickup. Apart, but complete long-block (forgot-I lost the rods when I moved). What's it worth? Standard bore, should easily go .030, timing chain broke and bent some valves. I have had it since '92. I also have a standard 427 steel crank to go with it.
Heel & Toe
Joined: Jun 2005
Posts: 19
Likes: 0
Originally Posted by 427Hotrod
Real cheap can be a 366 truck crank, stock rods and some decent forged pistons. Do a balance job and you're in business.
If you are going to buy an aftermarket rotating assy, I'd get a 4.250 crank and make a 489 or a 496 out of it. They rev 7000 rpm too!
JIM
If you are going to buy an aftermarket rotating assy, I'd get a 4.250 crank and make a 489 or a 496 out of it. They rev 7000 rpm too!
JIM
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Melting Slicks
Joined: Jan 2006
Posts: 3,028
Likes: 2
From: North NJ
Yup, 427 & 454 same block. Diff stroke and bore changes the displacement.
I have a 454 block from a late 80's pickup.
I'd yell "junkyard here you come" but its a lot of work to pull a block, pay for it and then find out its warped/cracked/ no good at a machine shop. Spend a bit more and get one thats already been checked out.
You need a solid foundation.
Good luck.
I have a 454 block from a late 80's pickup.
I'd yell "junkyard here you come" but its a lot of work to pull a block, pay for it and then find out its warped/cracked/ no good at a machine shop. Spend a bit more and get one thats already been checked out.
You need a solid foundation.
Good luck.