Picking up a 400 SBC - Page 6 - Chevelle Tech
Engine General Engine Discussion.

 73Likes
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #76 of 89 (permalink) Old Dec 4th, 19, 4:31 PM
Lifetime Premium Member
Jeff
 
Join Date: Jan 2002
Location: western ma.
Posts: 599
Re: Picking up a 400 SBC

I use Dem-Kote class F red insulating enamel. I got a spray can of it at a nearby electric motor rebuilding shop. It's what they use on the insides of electric motors. I've done 3-4 engines with the same can. It covers well and I've never had any come off.

Last edited by nitrofox; Dec 4th, 19 at 4:54 PM.
nitrofox is offline  
Sponsored Links
Advertisement
 
post #77 of 89 (permalink) Old Dec 4th, 19, 4:48 PM
Team Member
Tom
 
Join Date: Sep 1998
Location: Mustang, OK USA
Posts: 12,521
Re: Picking up a 400 SBC

Quote:
Originally Posted by 427L88 View Post
Tom, Glyptol or some other paint?

Dupli Color rattle can, Chevy orange from O'Riellys.

This paint is over 20yrs old.
Attached Thumbnails
Click image for larger version

Name:	SB400headoff.jpg
Views:	14
Size:	121.7 KB
ID:	610002   Click image for larger version

Name:	dualholes.jpg
Views:	12
Size:	114.1 KB
ID:	610004  
mr 4 speed likes this.

Tom Parsons
TC# 474
#3 FOREVER!!!!!
Light travels faster than sound. That is why some people appear to be bright until you hear them speak. (unknown)
DZAUTO is offline  
post #78 of 89 (permalink) Old Dec 5th, 19, 2:30 AM
Lifetime Premium Member
 
Join Date: Jul 2000
Location: In the Shadow of GIANTS stadium,N.J.
Posts: 7,927
Garage
Re: Picking up a 400 SBC

Quote:
Originally Posted by Aaron View Post
The casting numbers on the heads I took off are 462624.
C& P'ed from link below:

462624
350
76-87
1.94/1.50 or 2.02/1.60
76cc Crack prone

Chevy Casting Number identification - Block casting numbers
good link with lots of OEM Chevy numbers

John
71 El Camino SS
406 SBC M21 3.31 12 bolt
"Quality is always remembered,long after the price is forgotten"
71350SS is online now  
 
post #79 of 89 (permalink) Old Jan 25th, 20, 2:50 PM Thread Starter
Lifetime Premium Member
 
Join Date: Oct 1998
Location: Florida
Posts: 10,910
Re: Picking up a 400 SBC

Wanted to give you my update on my 400 sbc find.

Yes, it was a virgin bore 400. Full deck height.

Everything looked real good on first inspection.

Had NO cracks in the usual spots on the 400.

The machinist sent it to the hot tank and it came back looking real good.

Upon inspection of the caps, he found that the oil pump main had cracks in it and another crack in the bolt boss.

So...its no good.....back to square one. Have less than 800 in this block, but its less than 800 down the tubes....

Should of just saved an bought an aftermarket block. Would have a good chunk of that done.

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
Aaron is offline  
post #80 of 89 (permalink) Old Jan 25th, 20, 3:37 PM
Lifetime Premium Member
Jim
 
Join Date: Nov 1999
Location: International Falls MN
Posts: 6,355
Re: Picking up a 400 SBC

Bummer.

Jim

77 Monte
421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. from Jake 200-4r w/ 3.73's
Machine work by Torvinen's machine
11.93 @ 112.7 & tuning
67 Imp.SS for the wife 275 hp 327-TH350
77 cruiser is online now  
post #81 of 89 (permalink) Old Jan 25th, 20, 3:41 PM Thread Starter
Lifetime Premium Member
 
Join Date: Oct 1998
Location: Florida
Posts: 10,910
Re: Picking up a 400 SBC

Quote:
Originally Posted by 77 cruiser View Post
Bummer.
Your right about that!

Machinist said it looked like a redneck had overtorqued some bolts......

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
Aaron is offline  
post #82 of 89 (permalink) Old Jan 25th, 20, 4:12 PM
Tech Team
 
Join Date: Feb 2019
Posts: 790
Re: Picking up a 400 SBC

I have an old 400 std. bore engine in the garage that has a 268H CC cam performer RPM and has 487X heads. Will run on 87 oct. and goes like a bat out of hell for a mostly stock 400. Was going to sell it but I am doing a 406 testing this year and I might clean it up to toss it in the race car just to see what it runs for the 1st. test then go to the good 406 next. Would make for a great youtube videos.
shovelrick likes this.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
68Chevele is offline  
post #83 of 89 (permalink) Old Jan 25th, 20, 11:31 PM
Lifetime Premium Member
Tom
 
Join Date: Oct 2017
Location: Traverse City, MI
Posts: 132
Re: Picking up a 400 SBC

I feel your pain!

As I mentioned earlier, I am done buying 400 factory blocks - I will go with a Dart SHP instead. In my area, if the block checks out ($125 for a clean and crack check) you still have another $600 in machining - add to that the cost of acquiring the block and you typically have $1,000 if not more into a factory block. If you can find a Dart blem block, the can be had for $1,300 and it is a better block.

I did acquire another 400 a couple of months ago, but it was motivating the truck I purchased. I bought the truck because it was a 1978 GMC from Arizona and has a solid body, it just happened to have a 1972 400 under the hood (original 350 truck). I am not hopeful that the engine is useful, I know it blew head gaskets twice before I got it, it has a 1973 - 350 head on one side and a 1972 - 400 head on the other, have not torn it down enough to see if steam holes were put in the 350 head. There was no antifreeze in the oil when I drained it, but there was oil in the cooling system!

I currently have a 1974 - 350 I rebuilt myself that is still on a stand ready for break-in. My current plan is to put that engine in the GMC, but there is that side of me that wants to check out the 400 before I condemn it. At this point I will not even consider selling the 400 until I have it torn down and crack checked - if it is good I can sell with confidence, if not I saved someone from being mad at me! If it does turn out good, I can see I may want to rebuild it and use it in the truck - torque is my friend in that chassis.

As for my Chevelle, I am dusting off a 427 big block I had laying around to put in my sons 1966 Caprice - he is selling the Caprice and I am not selling the 427 with it!
shovelrick likes this.
1975TypeS-3 is offline  
post #84 of 89 (permalink) Old Jan 26th, 20, 12:13 AM
Team Member
George
 
Join Date: Feb 2010
Location: Upper Sandusky, Ohio
Posts: 2,710
Re: Picking up a 400 SBC

Quote:
Originally Posted by Aaron View Post
Wanted to give you my update on my 400 sbc find.

Yes, it was a virgin bore 400. Full deck height.

Everything looked real good on first inspection.

Had NO cracks in the usual spots on the 400.

The machinist sent it to the hot tank and it came back looking real good.

Upon inspection of the caps, he found that the oil pump main had cracks in it and another crack in the bolt boss.

So...its no good.....back to square one. Have less than 800 in this block, but its less than 800 down the tubes....

Should of just saved an bought an aftermarket block. Would have a good chunk of that done.
Sorry to hear it. Thats the way my luck goes normally.

'71 Malibu
3580 #, Carbed 6.0l LS swap in process
T-350, PTC 9" converter, 12 bolt, spool, 3.90 gears, MT ET R 275/60/15

355 [email protected]
125 [email protected]
388 Mud Motor- [email protected]
100 shot [email protected]
'72 Greenbrier Wagon: 454, 700R4, 12 bolt with 3.73
Geo71 is offline  
post #85 of 89 (permalink) Old Jan 26th, 20, 12:30 AM Thread Starter
Lifetime Premium Member
 
Join Date: Oct 1998
Location: Florida
Posts: 10,910
Re: Picking up a 400 SBC

Quote:
Originally Posted by Geo71 View Post
Sorry to hear it. Thats the way my luck goes normally.
Yep! It is what it is George. I hate to say that old of the old blocks are starting to show their age....

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
Aaron is offline  
post #86 of 89 (permalink) Old Jan 26th, 20, 4:19 AM
Tech Team
 
Join Date: Oct 2019
Posts: 137
Re: Picking up a 400 SBC

Hi
yup
the old 400 blocks are showing there age now . Mainly because they have done a lot of miles [corrosion] but still many have failed due to poor repairs DOH !!! . If u don't no how to do something ask or send it to the machine shop --simple really..

Aaron
there have been many articles about block prep and u discovered why . Thankfully the issues were discovered .

The after market blocks have way way thicker bores . The articles mention bores as thin as .090 on production blocks !!!!!

Pinch point or MCSA min cross section area IS KING . Port volume follows next ,then valve size

On a 400 cuin
port size of 1206 gasket is best
2.08 valve size minimum
afr 195 competition head 1.9 pinch [street version does not flow enough] the comp version is a little small but ok for 383
afr 210 comp 2.1 pinch
Brodix 215 cc heads have a reasonable flow. MCSA?? approx. over 2.1 ?? Brodix don't tell ya

difference between 195 vs 210 head is 10-15 hp
biggest gain is inlet manifold change 20hp
biggest cam 230/236 or 236/242 HR for street mainly for brake vacuum
peak hp 5800---6100

242/248 seems to be common . Peak hp 6100---6300rpm Dart 215 heads

Afr 220cc comp heads 2.180 pinch 2.1 valve and make power to 6500rpm with 250/260 SR cam
afr227 comp 2.3 pinch ,,,,valve=2.1 shaft rockers required 260++ SR cam 6700--6800 peak 13:1 CR 640hp

Remember the chevy port must be inefficient as smaller ports can flow better in other brands .
Ford Windsor AFR 200cc head with 2.160 PINCH makes a ton of hp on a 408 240++HR
swampy 6x6 is offline  
post #87 of 89 (permalink) Old Jan 26th, 20, 7:57 PM
Team Member
George
 
Join Date: Feb 2010
Location: Upper Sandusky, Ohio
Posts: 2,710
Re: Picking up a 400 SBC

Quote:
Originally Posted by Aaron View Post
Yep! It is what it is George. I hate to say that old of the old blocks are starting to show their age....
Yeah I couldnt roll the dice on one or spend the $$$ on an aftermarket block...LS was the way for me to go. Hopefully it was a good decision in the end...

'71 Malibu
3580 #, Carbed 6.0l LS swap in process
T-350, PTC 9" converter, 12 bolt, spool, 3.90 gears, MT ET R 275/60/15

355 [email protected]
125 [email protected]
388 Mud Motor- [email protected]
100 shot [email protected]
'72 Greenbrier Wagon: 454, 700R4, 12 bolt with 3.73
Geo71 is offline  
post #88 of 89 (permalink) Old Feb 1st, 20, 1:49 PM Thread Starter
Lifetime Premium Member
 
Join Date: Oct 1998
Location: Florida
Posts: 10,910
Re: Picking up a 400 SBC

Picked up my block today and I have a question.

I didn't ask my machinist about this, but he indicated its very expensive and kind of pushed it aside, so I didn't inquire more. He doesn't have the machine to do the job anyways.

I think the block itself is ok, its just that rear main cap that has the damage and cracks to it.

I already have the studs of the block.

Can I just replace the rear main cap? Im not building a racer here. Just a stout cruiser at around 550 horse.

If so, how much would I be spending on making this repair?

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
Aaron is offline  
post #89 of 89 (permalink) Old Feb 1st, 20, 2:21 PM
Tech Team
 
Join Date: Feb 2019
Posts: 790
Re: Picking up a 400 SBC

Quote:
Originally Posted by Aaron View Post
Picked up my block today and I have a question.

I didn't ask my machinist about this, but he indicated its very expensive and kind of pushed it aside, so I didn't inquire more. He doesn't have the machine to do the job anyways.

I think the block itself is ok, its just that rear main cap that has the damage and cracks to it.

I already have the studs of the block.

Can I just replace the rear main cap? Im not building a racer here. Just a stout cruiser at around 550 horse.

If so, how much would I be spending on making this repair?
Yes you can just replace the main cap and take a chance, but it may need to be line honed. Cheaper to just get another block.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
68Chevele is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in













Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome