Measurement of stock alternator housing

[Don in VT]

Greetings to the Forum

I need a favor from someone on the forum. I need the diameter measurement of the alterator housing on a stock alterator from a 1990 ZR. If someone could measure the diameter of the rear of the housing and let me know what it is I can be sure if my new unit will fit.

Many thanks,

Don

:saluting:

[tomtom72]

5 5/8" is what I get when I measure the back side with a tape. That is not using the ears that are for the bolts that hold the front & back sides of the case though.

If I use my digital slide ruler I get 5.6".

This is a 91 alternator, it's my spare. I do think that all the LT5's use the same alternator?

:cheers:
Tom

[-=Jeff=-]

is your new unit from a LT1/4? if so it will not fit

[Don in VT]

Hi TomTom,

Thanks for the measurement. My alternator measures the same.

Regards,

Don

[Don in VT]

Hi Jeff,

Thanks for the heads up on the LT1/4 aternators. Could you get back to me with just what the difference is, in alternators, between the LT5 and the LT1/4?

Regards,

Don

[-=Jeff=-]

Case size. The LT1/5 have a larger case then the LT5 does

[GOLDCYLON]

Case size. The LT1/5 have a larger case then the LT5 does

Amps are different as well

[Don in VT]

My case appears to be the right size @ 5.6 in. I just hope the mounting ears are in the right place. The electrical seems to be OK. The pulley diameter is a bit larger so I will have to pick a longer belt but that is no big problem.

Thanks for the help

Don

:cheers:

[a1991zr1]

yo know you can reclock the alt if the ears dont line up and also change the pulley to your old pulley fyi