I have a 67 Firebird 400 Convertible, 4bbl. It has the 3 speed automatic transmission, PB, PS, PW, Power Top and AC My engine code is YF, instead of the YT which I believe should be correct for that transmission. I am assured this is the original motor and have done some research and found on the Hemmings site that the YF was indeed used on the 67. I have submitted for the PHS docs and have not received them yet. I have emailed the PHS and he said it should be a YT code. Can somebody please give me some info?

Welcome to the site!

The date code off the block would be helpful.

According to Fred's Pontiac Info, in 1965 and 66 a YF block is a 4 bbl 389 with A/C.

In 1967, a YF is a 400 4bbl auto, but in a full-size car.

In 1969, a YF block was a 400 2bbl auto trans in a Grand Prix.

http://www.teufert.net/

These are now 40+ year old cars. Many strange things could have happened to them along the way. My entire rear axle was swapped out from the 3.08 ratio that PHS says it left the factory with to a 2.56 ratio.

Welcome!

This link is helpful for finding and decoding engine date codes: Year One's engine codes

This also may be helpful for decoding drivetrain codes especially the transmission.

https://firstgenfirebird.org/firebird/1967/id_numbers.html

https://firstgenfirebird.org/firebird/1969/id_numbers.html

Let us know what you find out.

According to the Wallace charts YT or YF was a 400 Automatic code.

And it mentioned AC for the YF. I just wanted to be sure this is the original motor. I wasn't sure if the YF code was put in Firebirds/

The PHS will have the correct engine unit motor number which is just below the YT/YF. No YF was used on 67 Firebirds.

SR (service replacement) would be the only other "correct" code.

The 7 digit casting number would help. But nonetheless, if YF, not correct.

Casting number is 450952

I have checked 2 sites and can't find that casting number.

Alright - Post # 3000

MArk,

That is the engine motor unit # I believe..

Thanks for all your replies and they have all been helpful. I am not trying to discredit any opinions or theories here, I am just trying to get this right. If you follow the Hemmings link on the bottom here and scroll to Pontiac, it says that the YF and YT motors were in the Firebird. However, to further validate everyone on this post, Hemmings is the ONLY site I have found this information. If anyone has time, please follow that link and tell me I'm crazy! I'm really sorry for all the posts!

Check out this article I found on Hemmings.com:
http://www.hemmings.com/mus/stories/2005/03/01/hmn_feature1.html

YE, YF, YT, WI, WQ, WZ, WU, XN Firebird optional "Ram Air" (1967)

The YE and YF are DEAD wrong. Pontiac would never, ever place a YF or YE coded engine in a Firebird when a Full sized car had the same code. There were reasons Pontiac used specific codes with specific cars. I am sure if you called PHS with the engine motor unit number and the block code, they will tell you it came from something other than a Firebird.

The YT is Auto
The WZ is manual
The WI, WQ,and XN are Firebird Ram Air

https://firstgenfirebird.org/firebird/1967/id_numbers.html

Above from this site..

From looking at the Hemmings information for maybe 2 minutes, I picked out at least 12 misprints.

I don't know if this helps

Cowl Tag:

03 D
ST 67-22667 LOR 3670 BODY
TR 257 Z o7 PAINT
EXDL 2EZGS 3JF 4F

All 67 Firebird 400 automatics came with YT coded blocks.

SR or service replacement only exception.

The cowl tag does not help. From 67-9 all 400 Firebird autos (base) were YT.

I too just looked at the Hemmings link and saw that they had all the same (but incorrect) codes for the '67 Ram Air 400 as the "base" 400. They do not differentiate between auto and manual trannys

Note they do not even HAVE a listing for either the Ram Air 1 or II for 1968 Firebirds.

Sorry, but their info is complete crap.

No need to apologize to me, I didn't write it!!!

It looks like somebody changed out your engine block along the way. Probably not the previous owner as it appears he passed on to you that the engine was original. Most likely a owner previous to that that failed to pass that information along.

http://thefirstgensite.com/html/enginecodes.htm Right from the service manual.

Hemmings and other periodicals are notoriously loose with facts. Many other printed books are not much better. And the web is full of inaccurate or sketchy information as well. So who do you trust?

1. Original factory literature
2. Reputable, acknowledged "experts"
3. Owner forums like this, where info is out in the open and the user pool is big enough and interested enough to correct misinformation.

YF is not original to your car.

Find the date code on the block. Just cusious what it is VS the car build date.
Same for the heads. Might as well decode it all.

FWIW

Y = A/T
W = M/T
X = RA

Since the block is not correct for your car, lets try'n find out what yr.
There is a casting # on top of the block(passinger side) next to the distributor. What is it?
May still have cylinder correct heads. What are the raised casting #'s on the center and/or outer exhuast ports below the valve covers?
While we'r at it, what is the casting # on the intake manifold?
Should be on top of #1 runner(drivers front).

Thanks guys. I am at the fire station today and will have numbers on here tomorrow!

Firefighter?
I'm a volunteer(lifetime retired").
They've been try to get me to come back for 2 yrs now, but i hate the political bs.

I am a career firefighter. I wont be able to get the numbers on until tomorrow. Thanks again for all the help!

OK sorry for the delay. Here are the other number from my 67 400:

3167 (in front of the carb)
GM1
9777755
9786286

Any help would be great. Also, I am trying to find the date code. I believe it is in front of the distributor, but where. I looked all over.

9777755 = LH exhaust manifold '67-'68 FB
9786286 = 1967 400 intake

Try this to find the other relevant numbers: http://www.yearone.com/updatedsinglepages/Id_info/pontiacengineid/pontengid1.html