danfr
VIP MEMBER
- Joined
- Oct 17, 2012
- Messages
- 138

Maybe someone can start a new thread on this.Interesting... and the reasons being??
Maybe someone can start a new thread on this.Interesting... and the reasons being??
Thanks for the reply!Yes
Yes they are compatible
Combat increased power tune coupled that extra power being at high revs, resulting in piston tops departing and premature main bearing failure pre superblend.and the reasons being??
You are indeed mistaken. The smaller plug you refer to was used without the large filter/oil pick up plug on 200,000 series cases. So '72 only.Hi guys, I'm confused.....This 71 crankcase here has what appears to have the larger drain plug.
My 72 has the smaller plug???
Am I mistaken or is the attached photos showing later cases .. not original engine
No don't....trawl through the volumes of material on here it will have been covered, and at a guess many times....Maybe someone can start a new thread on this.
200,000 series to be avoided.....if possible....The large drain/screen was deleated for 72 & reinstated the next year. Don't know the exact date or engine number but LAB will probably know.
You are indeed mistaken. The smaller plug you refer to was used without the large filter/oil pick up plug on 200,000 series cases. So '72 only.
And the answer to the OP is nope, whilst you could fit them, you should avoid 200,000 series ('72) cases, or you give yourself a range of other issues to solve including oil pick ups and breathers, and cam bushings!
'70/'71 as noted...fine.
As hinted at by L.A.B.
Totally agree the damage shown is a candidate for a weld repair.
Why? 200,000 series. That was something like '77. The issues were well known!
Well I have a 72 too, but the thrust washers with the tabs are not being used, if the tabs break off they are the perfect size to enter the oil return gallery and jam in the unprotected oil pump return gears.I am guessing this is because the tab on the thrust washer breaks off. It looks precarious.
As long as it is a 20M3S stamped case, 70 & 71 cases should be interchangable.Oookkkkk sooooooo no one knows about compatibility between 70 and 71 crank cases?
cheers
are you sure , if you miss the timing cover and the timing gear spindle ??As long as it is a 20M3S stamped case, 70 & 71 cases should be interchangable.
A case stamped 20M3 would not be directly compatible, as it is a twin timing chain engine with the points mounted behind the cylinders and the tach drive on the end of the camshaft, bolted to the timing cover (like an Atlas)
You are correct, the timing cover and other components are different as well. I was focusing mainly on the cases themselves.are you sure , if you miss the timing cover and the timing gear spindle ??