89formula maybe you should stick to pontiacs or whatever your into, cuz you've been wrong in every reply.

 

Rookie Question
What's the downside to stroking up the motor to 3.875 or 4.0? Will you start having clearance problems w/ values or what? All you see is the standard 3.75 cranks so there must be some downside. Just cost of the crank? I saw a 4.0 Lutani that was close to $1k.

Thanks for the education...

 

Check GregP's thread on stroking small blocks.

 

korvetkeith,
all i stated was if you want to make good power with a 400sb you need to invest $$ in heads and if i was in the market i'd be looking at brodix's, not afr's.
as for what i'm into, it's not going 14.5 in the 1/4 mile :p:

 

I'm sorry I'm only 16 with no money and I forgot that you know everything. I geuss I won't be building a 400 now because it would cost $6000 for heads.:rolleyes:

You may not like AFRs for some reason, but after all the research I've done you won't find any heads that will flow as much for a given intake cc's as the AFRs will. I would however put Brodix's as the next best and if they cost less for a comparable head I would say go with them (I don't think they would though.)


[Modified by korvetkeith, 9:09 AM 10/27/2001]

 

Keith,

You don't need to spend "$6000" on a set off heads.

I like AFR heads, I agree with what you said, for the money and the port size, they are very good heads.

Here's a post form GregP's thread I made about the Brodix 18x heads, if you're going to build a 400, I'd recommend considering them:

I was looking at the Brodix catalog and the 18x heads do require 18* pistons, but they don't cost any more than regular custom pistions really. I ordered a set of custom JE 18* pistons for my motor and they were $74 each. The 18x heads require ARP head studs for 18* heads which feature a 3/8" stud between the two center exhuast springs, but that's no big deal either. You can use standard lifters and standard 7/16" roller rockers or you can use Jesel/T&D shaft mounted 40/60 spaced shaft mounted if you want. You will need custom length pushrods as well, but that's not a big deal either. Just mock it up with an adjustable pushrod to determine your required length and then just order what you need. Also, Brodix says that the heads use a standard 10* intake face angle.
Here's Brodix's out of the box flow chart (cfm @ 28")

LIFT----------Intake--------Exhaust
.200-----------157.0---------122.3
.300-----------212.4---------164.2
.400-----------259.6---------199.6
.500-----------302.6---------217.3
.600-----------318.9---------226.0
.650-----------321.6---------229.9
.700-----------325.2---------232.5

Those are kickass numbers. For comparison, my Dart CNC ported 18* heads were flow tested and made:

Lift--------------- Intake---------Exhaust
.200-----------------132----------111
.300-----------------197----------188
.400-----------------258----------224
.500-----------------309----------242
.600-----------------346----------253
.700-----------------355----------260

As you can see, those Brodix heads flow extremely well at low lifts and flow 300+ cfm from .500" up. The exhaust ports are pretty good too. For $2200 complete, they are a very good deal.

As for being 16 and running 14.5 in the 1/4 - I woulda loved to have had a Corvette when I was 16...and at least you have enough integrity to post your real times rather than some BS times. I'd bet half the times posted on these forums are pure BS. Judging by what you read on the internet, everyone is running low 11 second street cars. I sure don't see that many of them out out there...




[Modified by Monty, 12:23 PM 10/27/2001]

 

all you have to to is buy the same heads for a 400 that you would a 350. drill the holes and your ready to go. a good set of 202 camals would work fine. what kind of times are you looking to run? my friend had a 72 chevelle with a 400 sb that was running in the 12's with cam intake and headers with stock heads. coverter and 3:73 posi . i see guys looking way to much into the miths of the 400. and the last time i looked a 454 was exteraly balinced


[Modified by Chev-Hell, 2:16 PM 10/28/2001]

 

Hey Monty, could you give a few more details of your freinds Allpro 227 427? Are you near Chicago? I'm right outside STL here.

 

Keith,

He used AFR 227 heads, not Allpro's. A Motown 427 shortblock, AFR heads, and a Comp roller cam. What ever specifics you want, I can find out or already know, what do you want to know?

I am in a NW suburb of Chicago, if you're ever in the area let me know.

 

My bad, for some reason I recalled my old catalog calling the 227s Allpros. Was the cam mechanical or hydraulic, what size were the headers, and what was the compression? I'm assuming from the high torque a hydaulic cam was used and it wasn't revved very high.


[Modified by korvetkeith, 1:39 PM 10/29/2001]

 

Yes, it was a hydraulic roller - 238/246 if I remember correctly. The headers wer 1 7/8", and around 10.7:1 CR.