Ok, I have been waiting for my 350 V8 for a month now,It's a first Gen. Now I have heard from people that it will fit, and from others it won't. This is what I have been told, First of all it will fit in my 4.3 v6 Spot and bolt right up to the 4x4 trans. I also heard that it can bolt right up to my V6 Motor mouts or the other way around, The V8 mouts will fit up to the Blazer. Another thing I also heard just the other night was that it won't fit because of the Diff in the front or something like that.Also heard I have to get a new Double hump oil pan. Any one here have a 1990 Model S-10 Blazer 4x4 with a 4.3 V6 that has put a First Gen V8 with out having to replace anything or change anything?

 

Don't have any first hand experience. My brother plopped a TPI engine out of a Trans Am into his 1st Gen S10 pickup and I don't remember him getting a new oil pan. Then again that was a 2WD. Motor mounts were different, yes. Jags That Run offers some pretty in-depth info for this swap. Check them out here. They say that they put a V8 in a 4X4 Blazer using the stock transfer case, driveshafts, and front and rear axles and they held up well. Hope this helps!

 

Yup, JTR is the place for S10 v8 conversion info for sure.

 

Check out the mod section. https://blazerforum.com/m_74069/tm.htm

 

Yes it will fit, but you do have to replace/modify several things...the motor mounts are the same design, but they mount farther forward on the V8, so you have to either build your own, or buy a set made for the conversion. Also the steering shaft has to be modified to clear the left exhaust manifold/header. The radiator has to be moved forward, and they say the best radiator to use is a stock one from a C4 (1984-1996) Corvette. I believe that in order to put one in a 4x4 you do in fact need to replace the oil pan to clear the front diff, but the rest of the drivetrain will work with the new engine, but I wouldn't expect it to hold up if you abuse it at all. You can buy a conversion kit with just about anything you need to do the swap from Jegs, or so I've heard.

 

Thanks Guys this information is really usefull.