307olds or 403olds

[81KiddCutty]

I am wondering who has a 403 olds in good condition because the 403 I got sucked it has 2 cracked cylinders and a small crack on the bottom of the block which is what I was told from the shop where it was gona get machined

So, your saying that your buddy (one hell of a buddy) traded you your 260 for a POS 403 and you didn't get your original motor back and tell him to use the 403 for a boat anchor? WOW, wanna buy some beach front property in Arizona?

Haha naw I got my 260 back and gave his pos 403 back so now I'm gona work on the 260 until I find a good 403

 

[Fox80]

You got out of that one lucky could have been stuck with a junk motor, you said you already had an exhaust on the 260 while it was in the car? What did you use for headers? I have an 80' Cutlass with a 260 that the previous owner did a horrible job scabbing up a dual exhaust, and basically destroyed the original manifolds. I just figured I would put headers on instead of trying to source a set of manifolds. I am in the process of milling a donor intake and welding on a standard holley bolt pattern adapter to eliminate the junk 2bbl that came on these motors. I will be posting pics later in the summer of what I have done to the heads and intake. I think a lot is to be gotten out of a 260 if you just free up the exhaust and intake stream, the stock HEI with the temp retarder is junk by all accounts.

 

[81KiddCutty]

You got out of that one lucky could have been stuck with a junk motor, you said you already had an exhaust on the 260 while it was in the car? What did you use for headers? I have an 80' Cutlass with a 260 that the previous owner did a horrible job scabbing up a dual exhaust, and basically destroyed the original manifolds. I just figured I would put headers on instead of trying to source a set of manifolds. I am in the process of milling a donor intake and welding on a standard holley bolt pattern adapter to eliminate the junk 2bbl that came on these motors. I will be posting pics later in the summer of what I have done to the heads and intake. I think a lot is to be gotten out of a 260 if you just free up the exhaust and intake stream, the stock HEI with the temp retarder is junk by all accounts.

I used full-length Flowtech headers from summit racing pn- BIG-31152FLT and the exhaust is a 2 1/2" designed like a grand nationals exhaust but better with two thrush glasspacks and an x-pipe I'll post up the design of it up soon and pics