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Topic Review (Newest First)
06-10-2013 07:39 AM
Coolrider
Steam holes???

Quote:
Originally Posted by gamedawg03 View Post
I am about to get my 406 built. I have brodix ik 200 heads from my 383 do i need to get steam holes drilled in them thanks
Hi! I was looking for the same investigation and i've found the following:
http://www.brodix.com/instructions/i...hevy_heads.pdf.

It looks like interesting.
01-26-2013 07:59 PM
vinniekq2 I went the other way. I built a 434 using a dart block.Way more horse power than I need,not as much as I want,lol. a very mild 434 can make north of 500 horse power and have a fairly smooth idle.They can also make 650 horse power and be very street able using a mild gear.
01-26-2013 04:31 PM
gamedawg03 Thanks for all the info. I just wanna do all my homework before i spend alot of money because its to easy to spend to hard to make back
01-26-2013 04:20 PM
cobalt327
Quote:
Originally Posted by cobalt327 View Post
Unless you use a custom crank having the 350 sbc stroke and 400 main journal diameter, you'll have to use thick spacer bearings or spacers behind regular 400 bearings.
Should read: "Unless you use a custom crank having the 350 sbc stroke and 400 main journal diameter, you'll have to use thick spacer bearings or spacers behind regular 350 bearings."
01-26-2013 04:14 PM
techinspector1 7cc flat-tops with a 76cc chamber will make 10.0:1 SCR.
18cc D-cups with a 76cc chamber will make 9.0:1 SCR
30cc D-cups with a 76cc chamber will make 8.3:1 SCR
7cc flat-tops with a 64cc chamber will make 11.4:1 SCR
18cc D-cups with a 64cc chamber will make 10.2:1 SCR (This is where I'd go for pump gas and 64cc aluminum heads)
30cc D-cups with a 64cc chamber will make 9.1:1 SCR
01-26-2013 03:59 PM
F-BIRD'88 If you got a 400block build a 406cid street engine. 377 is good for a blower motor using the 400 block.
You're not building a blower motor.

Get a 400 crank and some 5.7" rods.

64cc heads use a dished 400 piston on your 406.

70+cc heads can use a flat top 400 piston. Don't get it mixed up.
01-26-2013 11:32 AM
gamedawg03 Someone told me a 377 just a high rpm motor but u can make more power with less rpm on 406 or 421
01-26-2013 11:24 AM
cobalt327 Forget the 377. If you have a good 400 sbc block, build a 400.

The shorter stroke of the 350 crank in a 400 block looks good on paper, and can make a good displacement limited race engine. But for a street vehicle there's just no point in giving up ~25 ci.

Unless you use a custom crank having the 350 sbc stroke and 400 main journal diameter, you'll have to use thick spacer bearings or spacers behind regular 400 bearings. Neither of which are as as good as using a normal insert and the correct journal size that matches the main saddles of the block IMO.
01-26-2013 10:57 AM
gamedawg03 The guy at the machine shop said do a 377 instead of a 406 any info on 377
01-25-2013 02:03 PM
gamedawg03
Quote:
Originally Posted by Deathmunchy View Post
Since this topic is here. Let me know how your engine runs. I'm getting these heads as well and I've seen a few reviews of them but no ongoing discussions.
I really liked them on my 383 straight out the box vey well
01-25-2013 04:29 AM
Deathmunchy Since this topic is here. Let me know how your engine runs. I'm getting these heads as well and I've seen a few reviews of them but no ongoing discussions.
01-23-2013 10:34 AM
F-BIRD'88
Quote:
Originally Posted by cobalt327 View Post
Brodix says no steam holes. Period. That was confirmed to me some time ago. What is being talked about are the head gasket/block coolant passages, in some cases they don't line up as well as they could and need to be located better. There are also things to look out for on the head gaskets, as shown here: Small Block 400 Cooling Tricks.

FWIW, Joe Sherman doesn't use them. But he'll gladly do them for others. For a fee, of course.

As far as a 325 hp 10.25:1 sbc LS3 2bbl 400, I'll have to pass on that one. lol Except to say the only engine I know of that comes close to that was a 402 BBC. Another odd engine was the 265 hp bbc 396/2bbl.
This 400sbc was not a 2bbl engine. It was a factory 4bbl engine with factory flat top pistons and the 487X heads with factory 1.94x 1.60 valves.
The 487X head had a slightly larger intake port and probabily the best exhaust port of the like heads. It was factory rated at 330HP and was a true 10.25:1cr
It was only offered in the 1970 Impala. (I had seen these 400's in the Impala before and when the opportunity came up to buy one, I did. I bought the whole car. I knew exactly what it was, when I bought it.)

if you search a bit you will find mention of it.
It is mentioned in the larger versions of the Motors Manual and in the book Fix your Chevrolet. I got this stock 400 -330hp 10.25:1cr motor out of a used 1970 Impala. It made real good power in my 68 chevelle. Only the 454 I built and ran back then ran faster.
This was no 265Hp 2bbl motor. I installed Z/28 valve springs to get more rpm butr never cammed it.
I disassembled it after the block froze up. All stock GM internal parts. As stated.
I had a stock intake-and Qjet and a Edelbrock street master-750VS on it and headers and GM Z/28 valve springs. All else was stock GM. The stock GM springs were tired and it would not rev over 4500rpm with them.
It would rattle like a pig if you tried to use regular gas. Was not a big rever (stock cam) but pulled like a freight train.

These factory high compression ratio OEM 400 4bbl engines existed, just not widely known of especially by those that were not there at the time.

A friend here had one of those factory odd ball 2bbl 396 motors a 1969 chevelle w powerglide.
01-22-2013 11:56 PM
malc I have a 350 so steamholes are not an issue.
These are my IK200 heads check them out for steamholes.
Click the pic to enlarge it.

01-22-2013 11:49 PM
malc
Quote:
Originally Posted by techinspector1 View Post
Your statement is misleading. Looks like to me what they are actually saying is that the heads are manufactured with holes that match up with the holes in the block and that you must make sure the holes are drilled in the gaskets. Read it for yourself......

Q. Do you recommend steam holes on BRODIX heads?
A. No, the BRODIX water jacket is more efficient than previous heads. Just make sure all holes are properly lined up and drilled in head gaskets to efficiently pass water.
My statement is not misleading, they say no steamholes.
They do not say the heads already have steamholes, I read it that all the regular holes for water are checked to be lined up and clear.
Nowhere does it say there are steamholes in existence.

Q. Do you recommend steam holes on BRODIX heads?
A. No, the BRODIX water jacket is more efficient than previous heads. Just make sure all holes are properly lined up and drilled in head gaskets to efficiently pass water.

Anyway the original poster completely ignored my post so what do I care how you read it ?
01-22-2013 11:45 PM
1Gary Well they changed their advise.
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