Hey, i'm changing the oil in my old blazer, and i'm curious how much oil i need to get. I have a mobil 1 extended filter (about 2.5 times larger than stock) holley carb, and edelbrock intake. idk if it has an aftermarket pan or not.

5-6 quarts

Like finch said 5-6 quarts will get you close but you will want to verify the level on your dipstick after filling the crankcase and starting the engine to fill the oil filter and passages completely.

with stock pan and the filter you are going to be around 6 or 7 can't remember what my 87 with a napa extra capacity oil filter held.

Stock is 5 quarts with stock oil pan and filter. Long filter usually adds 1 quart.

it's a crate motor. all i know is i've put 7 quarts in, and it's still showing a quart low on the dipstick

Do you have the correct dipstick installed in the motor.

it's a crate motor. all i know is i've put 7 quarts in, and it's still showing a quart low on the dipstick

Which crate motor?

sounds like a deep or wide pan to me. or a short dipstick. lol

sounds like a deep or wide pan to me. or a short dipstick. lol

I bet you have heard that before huh!?!? :D

Just Kidding

I used to swap quite a few 350's in the old days. A few crate engines, but most were good ,low mileage ones from the bone yard. Chevy used a lot of different shaped oil pans so I'd often have to swap out pans. Depending upon what year chassis it was out of, sometimes the deepest part of the sump was in the front, sometimes in the rear and sometimes in the middle. It wasn't unusual to have to change the oil pick-up along with the pan. They also used 2 types of dipstick configurations. One went into the block and the other into the oil pan. To make a short story long, Chevy had a zillion different lengths of dip-sticks for their 350's. As I remember, they all held the same amount of oil. 5 quarts including the standard filter. The optional long filter held 2 qts. which, if my math is correct would be a total of 6qts. Unless you have an aftermarket or modified pan, 6 qts should be enough. Get a dipstick that will read with 6 qts. and on a level surface either file or paint a line to indicate full. If you have a dip-stick tube, make sure it is pressed in all the way. Sometimes they were hard to get fully seated. The ones in the pan are brazed in. I suppose you could trim the tube until the stick reads right.

I used to swap quite a few 350's in the old days. A few crate engines, but most were good ,low mileage ones from the bone yard. Chevy used a lot of different shaped oil pans so I'd often have to swap out pans. Depending upon what year chassis it was out of, sometimes the deepest part of the sump was in the front, sometimes in the rear and sometimes in the middle. It wasn't unusual to have to change the oil pick-up along with the pan. They also used 2 types of dipstick configurations. One went into the block and the other into the oil pan. To make a short story long, Chevy had a zillion different lengths of dip-sticks for their 350's. As I remember, they all held the same amount of oil. 5 quarts including the standard filter. The optional long filter held 2 qts. which, if my math is correct would be a total of 6qts. Unless you have an aftermarket or modified pan, 6 qts should be enough. Get a dipstick that will read with 6 qts. and on a level surface either file or paint a line to indicate full. If you have a dip-stick tube, make sure it is pressed in all the way. Sometimes they were hard to get fully seated. The ones in the pan are brazed in. I suppose you could trim the tube until the stick reads right.
X2... make sure you get the right dipstick/pan configuration. Also make darn sure you don't overfill...just one quart over makes a big difference...Don't ask..