Rich72

Almost ready to start working on the Vette. I have been drooling over the idea of a SB 427 :smiliedrool:

What have you heard about them?

Thanks.................. :chevy


[Modified by Rich72, 5:52 PM 5/16/2004]

427V8

I have a 434. It's not bad, But I'd build a 406 next time. Too hard to get pistons etc.

Course that was almost 5 years ago now...

Other than that the torque is pretty cool...

MotorHead

:withstupid: I looked into it too and decided to go with a 406 much easier on parts and pocket book :D

gkull

As a proud owner of a 427 Motown blocked motor. No way would I ever attempt to use a stock 400 block for anything ever again.

The Motown and Dart blocks are so heavy duty. They redesign out all the flaws that GM had from 30+ years ago.

I would go with the taller deck block with it's raised cam position. That way you will never have to worry about cam/rod clearance.

Mine has been put together with all quality forged parts and should make about 600 hp and 580 tq. My compression with 20 cc dished Wiseco pistons and AFR 64cc chamber heads is 10.34 and little lower than I wanted. But with 76 cc heads the compression becomes 8.4 or so which would be perfect for a blower motor. Now I wish that I had my original hood so I could cut it out if I decide to use a 2 X 4 type roots blower





[Modified by gkull, 9:04 AM 5/17/2004]

Dalannex

So what is a 406 then? A bored 400? And what is it that makes the 406 a cheaper motor to build? Is it just the fact that I won't need to buy a crank? And..... :D I had a couple of people tell me that the 400's were discontinued because they had overheating problems related to the heads that the general put on them? Is this true? I am asking all this because I have a couple of 400's and I want to build one of them into either a 427 or now possibly a 406.


-Justin

8T1-7T9 BIONIC VETTE

Be nasty :reddevil
Go with a SB 427 ci and spank everything in sight. :thumbs: :steering:

427V8

Yes a 406 is a .030" over 400.
a 427 is a stroked 400 (4 inch stroke vs 3.75)
a 434 is a stroked 406

Crank rods cam and everything else is the same $$

Pistons are (or were ) custom
Block clearancing, I suppose you can do it yourself if you want....

Another thing is it gets hard to keep the compression down with that much stroke. I have 76cc heads, 9cc dishes and I'm right at 10.5:1

With a 406 you're only loosing 27 cubic inches not that much power difference...

Also, it's not like you can tell it's not a 350. Build a 406 and tell everyone it's a 427 :smash:

I think a 406 with 6"rods would rock

Ganey

Justin

406- bored 400. The 400 had ring sealing problems. Bore w/ torque plates. Duntov was working on max. c.i. (400 C.I. GM policy). 400 was meant to be a hi perf. engine, that's why the first ones had 4 bolt mains.
Things changed. See How the Corvette Got the BB on my website.
Go w/ the 406. For 427, as GKull said or time for a BB.

:cool:

Dalannex

Hi Ganey. How have you been. You must be lurking more than posting nowadays. I know that's what I do now. :) So this ring sealing problem, is that something that is cured with the torque plates when boring? What exactly does a torque plate do? My machinist has been building dirt track race car engines (406's) for as long as I've been alive so he should be able to help me out too.

Is the block clearancing the same kind of idea as block clearancing on a 383?

-Justin

Fevre

The torq plate simulates having the heads torq down when they bore it, when torqed down the heads can cause the bore to distort and get out of round so having the torq plate on when boring allows for a more round cyl bore thus better ring seal.

gkull

For anybody that just has to use the Stock 400 block the 3.875 stroker kits are max that I would use. The 415 - 421 ci motors are much better than a 400-406.

For 4.00 - 4.125 stroker motors the aftermarket blocks are the only way to go. The cost for a 427 ci is the same as all through 441 ci The 454 - 482 ci small blocks cost big bucks and you would be better off just going with a supercharger or N2O as a power adder.

Cappy does drive around every day in his 427 power Vette with 565 hp and 550 tq in front of a 700R4 3.73 gears and a 3000 or so stall. Machines like that are hard to beat!:) So hard if fact that they won't let him come to the drag strip because it's a 11. second car. They won't let him race without a roll cage.

Dalannex

How about this one. :D You say the 415-421 stroker kits........where exactly does a guy get one of those? I actually would like to see somewhere that sells stroker kits for stock GM 400 blocks. Anybody know of a place? And, the 400 that I have (I haven't taken it apart yet), if I go with different pistons and an overhaul with some aftermaket heads or another, a cam, intake, stock block, crank, and rods, what can I get for RPM's out of this thing? 5500-6000??? I have this engine sitting there and want to use it with install plans of next winter, and am kind of feeling the waters to see what I can do on a budget and still get decent power. The on a budget part is where the 406 vs. 427 part comes in.


-Justin

gkull

Other than the 3.875 total forged kit that I have sitting in a box on the bench next to my Vette. A variety of places sells them. I've always had good luck with http://www.flatlanderracing.com You have to go online and down in the left hand pane to stroker kits for chevy's.

My kit is the small main journal size (350 type) So without a aftermarket block it's only suitable for 396 ci 4.030 bore stroker motors or 415 ci with it's existing Wiseco pistons for a 4.125 bore.





[Modified by gkull, 10:58 PM 5/18/2004]

The Money Pit

I run a 406 with a Scat 9000 crank and AFR heads.For the money I spent I could have built a 454 BB with mild hop ups.There's no way a mild 454 would catch this 406.Stroking is a great way to make power,but don't forget about the heads,or you'll end up with a tow truck motor that will roast the hides,but run out of breath upstairs where the HP is made.
Now if cash permits,by all means stroke it,but run a big cam and heads that will support it. :cheers: