400 Small Block Head Numbers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Already Gone** · 06-16-2019, 03:01 PM

I got the small block 400 I am going to redo and have a question about the head casting numbers. The heads are 333882 heads and it says they are from a a 70/80 400 engine with 76 cc chamber. Just near the casting number there is the numbers 827 78 cast into the block as well. Is this when the head was cast like I'm thinking 827 is 27th of August and the 78 is for 1978. I can't seem to find any reference to these numbers seaching the web.

**The Rocknrod** · 06-16-2019, 03:31 PM

1970-80 333882 350 (or) 400 1.94 int 1.5 exh 76 cc
Does it have a letter number pad like this?

**Already Gone** · 06-16-2019, 04:40 PM

Here is pics of the stamping on mine. Its stamped differently thatn the one you posted.

68Gold/white · 06-16-2019, 08:29 PM

78 is likely the year of manufacture. Most SB 400's were make from about 1970-1974? and put in full size cars, with 2 bbl carbs only. I have seen 400's in 78-80 4X4 pickups (only seen them in 4X4's, don't know why), these all had Quadrajets on them...

882 heads are the worst large vale small block heads, period.
You need something else. The World Products SR head is excellent!!!

**Already Gone** · 06-16-2019, 09:06 PM

Quote:

Originally Posted by 68Gold/white

78 is likely the year of manufacture. Most SB 400's were make from about 1970-1974? and put in full size cars, with 2 bbl carbs only. I have seen 400's in 78-80 4X4 pickups (only seen them in 4X4's, don't know why), these all had Quadrajets on them...

882 heads are the worst large vale small block heads, period.
You need something else. The World Products SR head is excellent!!!

Wasn't planning on using those I am going to use these from Summit along with different pistons, con rods , intake and cam..

https://www.summitracing.com/int/parts/sum-152123

**Captainfab** · 06-16-2019, 11:53 PM

Even with 72cc chambers you will need to be careful with your piston choice. Otherwise you may have detonation issues. Of course that is dependent on the cam used. And don't forget that the steam holes will have to be drilled.

Quote:

Originally Posted by Already Gone

Wasn't planning on using those I am going to use these from Summit along with different pistons, con rods , intake and cam..

https://www.summitracing.com/int/parts/sum-152123

**Already Gone** · 06-17-2019, 01:20 AM

Quote:

Originally Posted by Captainfab

Even with 72cc chambers you will need to be careful with your piston choice. Otherwise you may have detonation issues. Of course that is dependent on the cam used. And don't forget that the steam holes will have to be drilled.

Thanks for the tips. I have a very knowledgeable friend who will be doing the engine and he is also a machinist and will be drilling the steam holes. Here are links to the other parts he suggested i get for the build. Its avirgin block and will get a 30 over bore as well.

https://www.summitracing.com/int/parts/sca-25700

https://www.summitracing.com/int/parts/slp-h615cp30

https://www.summitracing.com/int/parts/edl-2101

https://www.summitracing.com/int/par...make/chevrolet

https://www.summitracing.com/int/parts/lun-10120701

**Captainfab** · 06-17-2019, 10:56 PM

A 406 with that cam will produce excellent low to mid range torque. But with the cams short duration and with those pistons and heads, I would definitely suggest checking the dynamic compression.

**Already Gone** · 06-17-2019, 11:40 PM

Quote:

Originally Posted by Captainfab

A 406 with that cam will produce excellent low to mid range torque. But with the cams short duration and with those pistons and heads, I would definitely suggest checking the dynamic compression.

I was told compression should be 9.1 or 9.2 with these parts..

06-16-2019, 03:01 PM	#1
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,068	400 Small Block Head Numbers I got the small block 400 I am going to redo and have a question about the head casting numbers. The heads are 333882 heads and it says they are from a a 70/80 400 engine with 76 cc chamber. Just near the casting number there is the numbers 827 78 cast into the block as well. Is this when the head was cast like I'm thinking 827 is 27th of August and the 78 is for 1978. I can't seem to find any reference to these numbers seaching the web. __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

06-16-2019, 03:31 PM	#2
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: 400 Small Block Head Numbers 1970-80 333882 350 (or) 400 1.94 int 1.5 exh 76 cc Does it have a letter number pad like this? __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? Last edited by The Rocknrod; 06-16-2019 at 03:39 PM.

06-16-2019, 04:40 PM	#3
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,068	Re: 400 Small Block Head Numbers Here is pics of the stamping on mine. Its stamped differently thatn the one you posted. Attached Images __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

06-16-2019, 08:29 PM	#4
68Gold/white Registered User Join Date: Sep 2011 Location: Ark City, Kansas Posts: 3,280	Re: 400 Small Block Head Numbers 78 is likely the year of manufacture. Most SB 400's were make from about 1970-1974? and put in full size cars, with 2 bbl carbs only. I have seen 400's in 78-80 4X4 pickups (only seen them in 4X4's, don't know why), these all had Quadrajets on them... 882 heads are the worst large vale small block heads, period. You need something else. The World Products SR head is excellent!!!

06-17-2019, 10:56 PM	#8
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: 400 Small Block Head Numbers A 406 with that cam will produce excellent low to mid range torque. But with the cams short duration and with those pistons and heads, I would definitely suggest checking the dynamic compression. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE



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