OLDS Possible olds 425 engine purchase

[DRIVEN]

Judging by the photos alone, I'd say that engine hasn't been a runner in a good long time. You're buying it as a rebuildable core.

 

[Bitterman]

Agreed. It will need a full rebuild.

 

[DRIVEN]

Then with that being a given, yes it's worth it.

 

[DRIVEN]

One additional possibility is that if you can come up with a 455 block, you can use the 425 rotating assembly but get the advantage of the more "modern" 39* lifter bank angle. That opens up more cam options as well as better heads. It's said that you'd need to use B heads with the 45* block, but I can't personally verify that. The pushrod holes can be opened up to use later heads on earlier blocks. Aftermarket heads might be okay already, if you were to go that direction.

 

[Bitterman]

If the 425 checks out, I'm good with staying with it. Even with fewer cam options, I'm sure there is a cam i'd be happy with. I'll have to do lots more research but it sounds like it is worth 200 bucks. If I end up getting it, I'll be looking for that flexplate.

If something gets fouled up or found when getting it machined, I like that I have the option to find a 455 block and use the rotating assembly.

I have some other projects to finish up before starting this build so I have time on my side.

 

[olds307 and 403]

As said, $200 is a great price. Just pay attention to bearing clearance and quality machine work if it needs rebuilt. Cutlassefi, Mark Remmel can get nearly any grind in 45 degree.

 

[Bitterman]

Good call. My machine shop did a great job with my last engine, but it was a 383 stroker. A common engine to machine. I'll chat with him. He may even have a lead in the flexplate.

 

[81cutlass]

I gave $250 for a good 425 crank alone and felt like I got a good deal, so yeah $200 for everything is a go in my books.

 

[Cajun83HO]

To make sure you know what you're getting, look at the casting number between water pump and intake, cross reference it. That will verify cam bank angle and lifter bore.
I do not let any olds big or small block get away. Getting scarce.

 

[Bitterman]

Well, I'm ready to go get this. I will cross reference the casting number as advised. Good call! I think my goal for this engine will be somewhere around the 500 hp range.

B heads flow fairly well or will I need to get some porting done to make my 500 hp goal?