|06-10-2013 06:39 AM|
It looks like interesting.
|01-26-2013 06:59 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 03:31 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 03:20 PM|
|01-26-2013 03:14 PM|
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 02:59 PM|
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 10:32 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 10:24 AM|
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 09:57 AM|
|gamedawg03||The guy at the machine shop said do a 377 instead of a 406 any info on 377|
|01-25-2013 01:03 PM|
|01-25-2013 03:29 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 09:34 AM|
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 10:56 PM|
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 10:49 PM|
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 10:45 PM|
|1Gary||Well they changed their advise.|
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