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427 Sbc
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
MY 2 cents is, you can build a 427ci out of a ordinary 400ci block no problem, it will most likely be a 434ci though. If you are going to go this route my advice is to go with top of line parts, do not put crappy $100 roller rockers on it. A good roller motor with heads capable of 600HP is going to cost you $10,000 minimum, forget about ebay 
C6 the C5 of tomorrow
Joined: Nov 2000
Posts: 6,665
Likes: 2
From: Twin Cities Minnesota
AFR said they don't recommend their 220 heads for street use due to the splayed valves wearing faster than something like the 210's
Keep the compression up?
I had to use 9cc dishes and 76cc chamber to keep the compression down to 10.5:1. Flat tops were like 12:1.
But with the compression I do have and the 108 degree LSA cam the ricers NEVER show up!
Keep the compression up?
I had to use 9cc dishes and 76cc chamber to keep the compression down to 10.5:1. Flat tops were like 12:1.
But with the compression I do have and the 108 degree LSA cam the ricers NEVER show up!
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Originally Posted by 427V8
AFR said they don't recommend their 220 heads for street use due to the splayed valves wearing faster than something like the 210's
Just look at it another way. Look at the port size on Big Block heads. Factory heads were 255 cc on the smaller oval port heads put in trucks. It's true that the dimensions add to the larger cc and top of the line small block heads exceed the cfm of flow of much larger big block heads.
After tested Dart Pro1 heads 215cc and Dart 227cc and now using AFR. The clear winner in design features is Dart. I don't have a clear winner in the port flow catagory. Because I have not done any real life side by side bench flow comparison. Just because of the small ports on AFR 210's I would only use them on hot 350's and 383's Once you get into near 400 ci or larger, Go big. The Motown 220 cc is what is used on the Bill Mitchell hard core long blocks.
If a Motown or Dart block costs $2000 (I would never use a 400 stock block)and some company told me that i could get an assembled short block for $4400 or so. Simple math would tell you that to cover a profit margin they used some cheap crap for parts in it.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Originally Posted by gkull
If a Motown or Dart block costs $2000 (I would never use a 400 stock block)and some company told me that i could get an assembled short block for $4400 or so. Simple math would tell you that to cover a profit margin they used some cheap crap for parts in it.
BTW Ohio crank produces cranks and rods in house so that might account for how they sell an all forged 434 short block for $3800 assembled less cam.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Originally Posted by CorvetteDave01
Do you have any pictures from the rear of your vette?
http://forums.corvetteforum.com/show...ighlight=gkull
Le Mans Master
Joined: Nov 2004
Posts: 6,434
Likes: 0
St. Jude Donor '07
Originally Posted by turtlevette
If it were that easy SB 427s wouldn't be 12 grand.
To get a 4" stroke you probably need a aftermarket block with raised cam and wider oil pan rails.
To get a 4" stroke you probably need a aftermarket block with raised cam and wider oil pan rails.
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Racer
Joined: Dec 2001
Posts: 328
Likes: 0
From: Dallas County Texas
...or mebbe b'cause a BB drops right in a C3 before they
lightened the rearend at the end of the series for weight savings.
I'm glad it has become viable to really stretch the cubes on the sb format to get them well into the original BB range, with 125+# weight savings, but the same techniques on BB formats are yeilding really amazing sizes. I also like the power I'm getting out of my 413 - more than any normal BB that ever came with one of these cars, but I haven't worked out all the bugs yet to see if I have something solid or not. I have always understood the restrictions on various classes of racing, but, with all that being said...
I'll repeat it again to TORTURE you sb devotees...I like so totally WOW man wish I had not spent $10K on a silly somewhat pushed sb from a supposedly reputatable local builder when I would have had conservatively 650 hp and 700 ftlbs from a medium effort BB.
THERE'S NO SUBSTITUTE FOR CUBIC INCHES!!!!....
....NO REPLACEMENT FOR DISPLACEMENT!!!!!!
BTW, I"d sooner have a stroked B or RB mopar with modern high flow wedge type heads than some 30 year old "Wonder" head design....
(Did ya'll notice how I CAPITALIZED the REAL engines?
)
I'm glad it has become viable to really stretch the cubes on the sb format to get them well into the original BB range, with 125+# weight savings, but the same techniques on BB formats are yeilding really amazing sizes. I also like the power I'm getting out of my 413 - more than any normal BB that ever came with one of these cars, but I haven't worked out all the bugs yet to see if I have something solid or not. I have always understood the restrictions on various classes of racing, but, with all that being said...
I'll repeat it again to TORTURE you sb devotees...I like so totally WOW man wish I had not spent $10K on a silly somewhat pushed sb from a supposedly reputatable local builder when I would have had conservatively 650 hp and 700 ftlbs from a medium effort BB.
THERE'S NO SUBSTITUTE FOR CUBIC INCHES!!!!....
....NO REPLACEMENT FOR DISPLACEMENT!!!!!!
BTW, I"d sooner have a stroked B or RB mopar with modern high flow wedge type heads than some 30 year old "Wonder" head design....
(Did ya'll notice how I CAPITALIZED the REAL engines?
)
Thread Starter
Racer
Joined: Apr 2004
Posts: 293
Likes: 0
I want to stay with a SBC for the weight savings and because everything on the car is for a SB; intake, valve covers, water pump, etc.. I just thought of the 427 size for sentimental reasons but as a SB. I don't really need 600 hp since I only drive the car to shows and a little on the street.
I do plan to put Hooker side exhaust on the car and bigger cubes means better sound.
This is actually a number match '69 and I want to save the engine and trans. for posterity so another block and maybe a keisler 5 spd. are in order.
Thanks to all for the good advice. The motown block sounds like a good idea.
I usually hang out on the C-5 forum.
I do plan to put Hooker side exhaust on the car and bigger cubes means better sound.
This is actually a number match '69 and I want to save the engine and trans. for posterity so another block and maybe a keisler 5 spd. are in order.
Thanks to all for the good advice. The motown block sounds like a good idea.
I usually hang out on the C-5 forum.
