This is what i was told about the motor...it could make a good rebuilder for my project, any info you could give me to shed light on this subject is greatly appreciated...

 

check to see if it has 3 freeze plugs per side if it does then its a 400 there is also something about the balance its either in the balancer or the fly wheel i think if its externally balanced its a 400 someone correct me if im wrong

 

T 06 11 C TU

T = Tonawanda, NY
06 = Month
11 = Day of Month
C = Vehicle Type (in this Case... "CAR")
TU = Engine ID Code

So its definitely not a "Truck" block.

According to two sources I checked... CTU was used for 1970 350 LT-1 "Corvette". (H.E.I., spec high perf, m/t LT1 370HP to be specific.)

However.... (see next post)

 

Alright... sorry for getting you hopes up...

CTU was also used on 1975 400 cid 175hp 4bbl LT4 .

http://www.chevy-camaro.com/chevy-ca...ffix-codes.asp

 

good lookin out. Its a 400 SBC LT4...Heh obviously not the same LT series as current...?

Something i should invest in?

Let me know...

 

CTU shows up as a 1970 Corvette LT1 engine or a 1975 400. You might want to get the casting date off the block just to be sure, but if it was in a 1974 truck then it probably is the 400.

 

However, "CTU" is not a truck block. So its definitely not the original motor. It could be a '75 replacement, but its worth checking the casting dates... just in case.

 

if possible, measure the bore and the main journal size. also, 400's have steam holes between the cylinders and yes, they are externally balanced.

 

Balancer on a 400 will have a scalloped out section on the outer ring. Check the block casting #. It is on the back of the engine on the bell housing extension, behind the oil pressure fitting.

Then check the number at mortec.com. If it ends in 509, it's a 400, like the one in my 71. But there are more 400 casting #'s.

 

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Not all 400 smallies have 3 freeze plugs per side. My 509 casting 400 has 2 per side with a provision for a 3rd.

Yes all 400's were externally balanced.

Just wanted to add that Information.

 

heres a few pics of the engine....

http://www.bgom.net/engine

 

check those pics, should help ya be sure...

 

wellm i didnt see a real good pic of the balancer and only 2 freeze plugs and the way that alternator mount is set up i would guess that its probably not a 400 theres still a chance it could be as everyone else said either measure the bore or check the other #s you didnt put on the bored

 

Woah! Are those not Corvette exhaust manifolds?

Ummm, definitely check the castings because that looks like it might be a LT1.

 

I think you can just make out the cutout portion of the balancer, but it's blurry. Not all 400's had 3 freeze plugs. The two 509 casting 400's I have built had only two.