It is from a 1971 C-Body or Imperial.

Were all non HP 440s in '71 LC engines?

Yea, I think I mentioned it was out of a New Yorker (or did I?). As I understand it, LC means low compression. There is no L on my pad. It has flat top pistons (no dish) at what appears to be zero deck, and the engine was a 4 bbl.

According to Allpar, the standard 4bbl 440 in 1971 had 9.5:1 compression, which may have been considered low at that time, but is fine with me today.

Mistakes happen, everything points to a LC engine.

There were two engine codes in the VINs for 1971 cars, U for HP engines & T for the non-HP cars.

I am sure someone here will know if one of the differences was in the compression ratio.

See the second half of my last post above. I think the lone C points to something else.

But there is no C by itself in the TSB I posted for 1971 cars, that & the other details make me think it may be a stamping mistake.

Well I can always rebuild it for compression, and if it's the original crankshaft, then obviously the B was wrong as well. What about the other details makes you think its low compression?

No HP.

You can have HP or LC but not both for an engine this year.

That is my theory.

I don't think it's suppose to be 'LC'?

Here is a 1968 440 (non-High Performance 350 horsepower) and T/F-727 I picked up in 2006/07 for $400.00.
It also has a 'C' stamped into it without an 'L' accompanying it. This combo was personally removed from a running station wagon by a guy I know well. He has no idea what he did the carburetor though, not that I wanted it anyways. He even threw in a set of original factory chrome valve covers!










Here is the passenger side of the engine with the head removed.

Sometimes I'm just simplistic.

The backwards "B" may only be the fact that the line worker stamping it had the punch oriented upside down or stamped it from the opposite side of the block as he normally would do. A "B" appears backwards depending on how it's orientated.

Just my

Frank

Three pistons were installed at the factory.

Flat top 66-71 All 440 350 0r 370,375 h.p. rated 10-1
440-6 w/4 valve relief-440-6 only (1/2 point higher rated 10.5)
72-78 low comp 8.5-1. (piston comp distance changed).

Rods have nothing to do with engine comp ratio.Both are the same length.

Only difference between 350h.p and 375 h.p. were cam,valve springs,dist,exh man,and carb.

OK, some new questions;
I have a block from a 71 New Yorker, it has the big rods, steel crank and flat-top pistons that are .100 in the hole at TDC.

It had 906 open chamber heads.

On the boss, G440, 1 19 HPA
Block casting #s 10-22-70 and 2536430-70 and 27143 on the pan mating surface.
The other stencilled #s on the lower boss near the pan are illegible. I'm assuming this was a 370 horse Chrysler with these components.

What was the comp. ratio with the pistons so far in the hole?? Can't be 10.0:1 can it?

Thanks Joe Latessa

Your 71 Engine was advertised as a 9.5 to 1 compression.370 horse U code.What are the date codes on the 906's ? I believe it should have 346 casting # heads.

There are 5 pistons used in 70-71...all new part #'s.
3420214
Used in 70 in the 9.7 350 horse T code C-Body engine.
Used in 71 in the 9.5 370 horse U code B/C HP eng.

3420218
70-71 V Code 6 Pak Piston.In 70 Advertised @ 10.5.In 71 advertised @ 10.3

3549426
Used in 70 U code Hp's 9.7 to 1

3549528
71 T code C-Body 440 9.0 to 1

3004539
70-71 Export Only 440 Low Compression