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Old 10-16-2012, 12:09 AM
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Default 400CI truck engine?

K so here is whats going on.

A friend and i are planning on putting this engine into a second gen camaro. It wont happen for sometime because of funds but i would like to see if i can get more info on the engine. Its been at my friends shop from a while sitting on a engine stand so we are going to try and make good use of it. So what i know so far is that its been sitting for probably 15 years, its a 400 cubic inch engine, my friend says he ran the block number. There is a unknown problem with it, no one can remember exactly why it was pulled from the car. Looks to me like it was modded and raced. Here are some pictures.





Block Number


Number on the Head.


Roller Rockers which i don't think are stock for a engine this old??


Someone told me the Double hump means performance head?? Not sure if that's true or not.





Any info is appreciated thanks.
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Old 10-16-2012, 12:20 AM
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Can someone move this to the SBC/BBC section? Thanks
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Old 10-16-2012, 12:59 AM
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What do you wanna know? Ive dealt with quite a few 400+ci SBC motors, even have my 406 shortblock still, with ARP studs etc.

Those heads are pretty much junk, looks like its probably got a cam in it going off the intake and rockers.
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Old 10-16-2012, 01:22 AM
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With a google search on the block, I saw it's a small block:

3951511, 1970-1980 400 ci car & Truck, 2 & 4-Bolt, 3-freeze plugs

so nothing too out of the ordinary there, but the heads look the ones on my 69 Z/28. I have to look at the pictures closer to make sure. I just looked in Jerry M's 67-68 book and the double hump heads look very different in 67 & 68. In your top picture the left hand head is kind of far away but it looks like it matches my 69.


Here is a picture of my 69 Z/28 double hump heads:



and my casting/date code


For the date:

first letter= month where A is January, B is Feb, etc
middle numbers are 1-31 for day of the month
last number is year, where 8=1969 and 9=1969

so for my right side head, L218 = Dec 21st 1968

yours looks like, I168 = Sep 16th 1968

-----------------------------------------
The 186 casting heads could have been used on 3 different engines:

Year CI Intake Exhaust
------------------------------
1968-69 302 2.02 1.6
1968-69 327 2.02 1.6
1970-72 350 2.02 1.6

So based on the date, the heads either went on a Z/28 DZ 302 motor or a 327 (maybe a L30).

They might be worth $$$ but I'm no expert on what they might be worth. For determining value, you could either try EBay with a high reserve number or posting a question in the Team Camaro "What's it Worth" section. Those guys sometimes give a value of 1/2 what you could get on EBay though.


Roller rockers might have been out in the 1960's but as far as I know, they were not stock:
http://www.harlandsharp.com/history.htm

According to Jerry MacNeish's book "The Definitive 1969 Camaro Z/28 - SS 396 Fact Book":

1969 302 cylinder heads were resdesigned with threaded bolt holes at each end for alternator bracket installation. The combustion chamber and valve size remained identical to earlier 302 castings (2.02-inch intake valves, 1.60 -inch exhaust valves). The 1969 302 casting number is 3927186. The double hump casting marks at each end were made smaller than the '67-'68 casting. All "186" castings installed in '69 Z/28's received pressed-in rocker arm studs. Casting numbers and date codes can be found when the valve cover is removed. The SS350 is equipped with "18" cylinder head castings, however, the valves are smaller (1.94-inch intake valves, 1.50-inch exhaust valves).
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Old 10-16-2012, 02:17 AM
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Ya you got a 400 with 327 double humps, and some 1.6 roller tips rockers, cam, looks like a 7 qt pan and an old victor jr intake. Probably in optimum configuration you'll get about 350- 400 hp at the crank depending on compression, rod length, cam choice, and if there was any port work. Should have no problem getting 300 to the back tire. Hope this helps
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Old 10-16-2012, 02:55 AM
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Quote:
Originally Posted by TrickrTreat View Post
with 327 double humps
Sam,

Do you have a way to know for sure if it's they went on a 327 and not a 302?

David
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Old 10-16-2012, 05:19 AM
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Wow thats a good read David
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Old 10-16-2012, 04:45 PM
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its the same casting number. So same head?
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Old 10-16-2012, 05:06 PM
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Quote:
Originally Posted by ILuvPizzaTimes10 View Post
its the same casting number. So same head?
I think so. If he goes to sell it, he should probably advertise it as a 1969 DZ 302 Z/28 head.
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Old 10-16-2012, 09:22 PM
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Quote:
Originally Posted by DavidS View Post
With a google search on the block, I saw it's a small block:

3951511, 1970-1980 400 ci car & Truck, 2 & 4-Bolt, 3-freeze plugs

so nothing too out of the ordinary there, but the heads look the ones on my 69 Z/28. I have to look at the pictures closer to make sure. I just looked in Jerry M's 67-68 book and the double hump heads look very different in 67 & 68. In your top picture the left hand head is kind of far away but it looks like it matches my 69.
Thanks for all the information! That's a big help.

Quote:
Originally Posted by TrickrTreat View Post
Ya you got a 400 with 327 double humps, and some 1.6 roller tips rockers, cam, looks like a 7 qt pan and an old victor jr intake. Probably in optimum configuration you'll get about 350- 400 hp at the crank depending on compression, rod length, cam choice, and if there was any port work. Should have no problem getting 300 to the back tire. Hope this helps
Yeah i took a picture of the pan because it seemed pretty deep. 300 is a lot more than i expected. Thanks for the info man!
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