4.1 compatability

[camcclure]

I have an 85 hot air car and ran across a rebuilt 4.1 shortblock with some good parts in it. Will my 3.8 stuff interchange with the 4.1 and would it be advisable? thanks I have got alot of good information from your site

 

[GNeric]

Make sure your water ports that are along the lifter valley are correct and everything else should swap over. We did a 4.1 into a Vega wagon and the heads were wrong for the block and it filled the block completely with water when we were ready to fire it up. Your 85 should have a 20 bolt oil pan and the 4.1 will have a 14 bolt. The timing cover and pan will be different in those respects and the 4.1 oil pan won't have an oil baffle in it.

 

[camcclure]

Thanks, So if I can come up with the tins and the 4.1 heads ,my intake and other parts will work?and should I use the 3.8 heads if they line up versus the 4.1s

 

[Ttype6]

Should I use the 3.8 heads if they line up versus the 4.1s

Yes.