6090-O head

[Anonymous]

I have a 144 block and I guess that the head it´s a 170.
The code is 6090-O.
I think that because of the low compresion being obtained after a rebuilt of the engine.
Does any body can advice me on that?

Thanks

Juan
San José, Costa Rica

 

[Falcon62]

Juan - The 6090 code is the code Ford used for ALL heads no matter what engine they went on. The heads for my 428CJ have the same 6090 code.

What you need to know is the first four characters of the casting code, that will at least tell you the year of manufacture and what vehicle the part was originally designed for. The "O" is the engineering change suffix and tells you how many times the part has been changed since the original design.

Here's a good Ford part number page for you: http://www.hammar.dyndns.org/~djhamma/partnumb.htm

 

[ski4evr]

Or Doug's webpage:

http://www.geocities.com/mustang_man_1966/ford_partnumber_decoder.html

ski

 

[Anonymous]

thanks guys...i just got my 200 and the casting # on the block is... D8BE-6090-BA....according to mikes site this has the bigger valves and hardened valve seats in it, is that a good head to use then on my 250, which has a 74 head?

 

[Anonymous]

78 and newer are the better heads. better flow

slap it on there! :wow:

 

[mugsy]

Juan,

Another reason for low compression is that the new head gasket is thicker than the OEM one. I thought my engine had bad rings but when I pulled the head I found an aftermarket head gasket. There have been many posts about the 0.045 inch think Felpro gasket and what it does to an engine designed for the 0.025 inch steel OEM gasket. I would check the engine for the type of head gasket, if that is the case then you will have to remove the head, measure the combustion chamber, deck height etc and mill the head accordingly.

tanx,
Mugsy

 

[Anonymous]

Thanks every body.

My engine after rebuilt has a constant 91 psi in all 6 cylinders.
According to the information in the forum (144-250 head swap FAQ, good sticky topic by David), I know that for an old 170 head the combustion chamber should be around 52 cc. Does anybody know the figure for a 144 head?
If it is, lets say 44 cc, so if milling 0.01" equals reduction of 2cc in the volume, I should cut around 0.08", plus 0.02" for the gasket thickness diff. , that's a 0.1" total !
Is it possible or suitable?

Regards,

Juan

 

[LEROY POLL]

HELLO JAUN


.....JAUN THE EARLY HEADS WERE ALL THE SAME UNTIL THE MIDDLE OF 1962. THE 1963 HEAD WERE ALL MADE BETTER. THE 144 AND 170 HEADS WERE NOT DIFFERNT. FORD MADE AND CHANGES TO THE STROKE AND PISTON HEIGHT TO MAKE A LARGER CHAMBER TO MAKE UP FOR THE COMP. RISE.

.....THE COMPRESSION WAS ABOUT 8.7-1 ON BOTH MOTORS, WITH ABOUT A 49-52 CC HEAD. YOUR 91 READINGS SEEMS LOW BUT IT IS GOOD TO HAVE ALL YOUR READINGS THAT CLOSE.

.....AS I REMEMBER THE CHANGES THAT HAVE BEEN MADE WOULD HAVE MADE YOU LOSE COMP. THE GASKETS WERE ONLY .01 AND HAD ONLY A 3.65 DIAMETER AND DECK HEIGHTS WERE.005. COMPARE THAT TO WHAT YOU BUY TODAY WILL MAKE SOME BIG CHANGES. HEAD GASKETRS ARE FROM .045-.052 THICK, 3.81+ FOR DIAMETER AND EVEN PISTON HAVE MORE PIN HEIGHT LOSS TO AROUND .02 SO.... THAT WOULD GIVE YOU ABOUT 7.0-1 TO 7.2-1 COMPRESSION. THAT WILL GIVE YOU ABOUT THE READINGS YOU HAVE.

....THE 144 BLOCK CAN BE BORE TO ABOUT 156 CU.INS. THATS ABOUT A .150 OVER BORE. SOME WERE OVER BORED BEFORE THE 170 CU. IN. CAME OUT. I DON'T KNOW ANY WHERE YOU CAN GET THE PISTONS TODAY, BUT THEY DID DO THIS TO SOME OF THE EARLY 144'S. THEIR WERE REPORTS OF MUCH STRONGER LOW END POWER FROM THE HIGHER COMPRESSION. THEY WERE STILL UNDER-POWERED.

.....THE ONLY PROBLEM WITH THE 144 AND 170 IS ,.....THEY ARN'T 7 MAIN-BEARING MOTORS. THEY'RE GOOD BUT THE 7 MAIN IS SO MUCH BETTER!! I'M SURE THE 144 AND 170 WOULD BE EVEN GREATER AND SMOOTHER WITH 7-MAIN.

.....HOPE I'M NOT STEPPING ON YOUR FEELINGS HERE. THE RANCHREO IS STRONGER AND SMOOTHER WITH 200 7 MAIN-BEARING MOTOR.

LOTS OF LUCK....LOL

LIVE IN GRACE

LEROY POLL