And to prove your are right I just got this new photo in this morning... Also, here is the "lump" at the back of the engine that told the assembly line machinists that this block is a 425 and needs a larger bore. I thought it was more of a leg shaped block. Can anyone share any light or confirm that yes, this is the bump that confirms the engine. What bore size should it be? That's the only real way to tell.
Thanks Tom. I already have a B262 or 671 I can use for induction. Can't wait to let this engine do what it's been patiently waiting to do fo 45 years. This engine is as old as me.
This may be the bell housing you need. The round "425 bump" has instances that are not true. I have two 425s here and they did not have the bump (KW and KX). I think the stampings are the best key. Ultimately, the bore will tell the story if it is apart. Cheryl
A bellhousing is also avail from Bendtsens. Ted Nagel had some issues with the EELCO one.....it is deeper than the stock one. http://www.transmissionadapters.com/index.htm Bump on the block....my 66 401's have the bump in the back too. So I don't agree that it's on 425's only.
Ok, we all agree that the "bump" is not a reliable indicator. I also agree that the Bendtsens product looks like the best choice. He did however attempt to discourage the M22 choice and instead (for a few hundred more) go with the TKO600 5 speed. I'll start a thread over in the transmission section about my manual trans choices.
That would be a false assumption to make unless you have determined that it was not year-specific ... whatever it is, its freakin' cool, and even cooler what you are going to do with it :TU:
Thanks Alan, I am kind of secretly hoping it's not something really special because I not only want to use it but I'll be using all available revs - probably daily. The world needs more yellow hot rods with exposed Nailheads revving out daily or disappearing into the distance and I'm willing to do my part.
Perhaps the block may be different in some way. The only nailhead experimental/prototype parts that I know of are: *"D" cylinder heads *"D" exhaust manifolds *Aluminum 2X4 intake manifold I looked at the photos and the heads, intake & exhaust manifolds look "stock". Marty
Don't forget about the Aluminum heads A total of 47 were made cast iron Tri power intake for the 364 Also made some different rods I cant remember what they called them I'm sure they made some other stuff to I know where I can get a set of Dport heads but the guy want lots of$$$$
the tripower would be for a 322 unless there is another one out there... Buick made a fair amount of X-perimental stuff. Just not much is out in the limelight. I thought Russ Martin had an aluminum 2x4 for each the 364 and 401-425 pictured on his site. My only concern if it is an early/experimental 425 would be porus castings, thin walls in the cylinders etc...I thought I had read that somewhere (maybe here) years ago.
Getting in on this late but I may be able to shed some light on the discussion. The "LW 72" stamp looks like the correct font type used for production engines. The "look" of the stamping is what I have come to expect of a factory stamp. It decodes as a `65 425 single 4 barrel that was produced on the 72nd shift at the engine plant. The "bump" pictured is not the typical bump used to determine a 425 block. The bump normally seen is lower on the bellhousing and is indeed a "leg"...almost like a hockey stick. It`s funny that someone mentioned a porous block casting. Looks like there are some pinholes in the cylinder wall in one of the pics. Hope I`m wrong! Seems a shame to wring the hell out an "X" motor just like any old Nail....not passing judgement here, to each his own. Really a rare chunk of iron, though. BTW, I remember way back when Buick issued a "sale flyer" to their dealers trying to empty the warehouses of their old Nailheads, probably around 1985-86. They`re still around. Sometimes a crated motor pops up but they are usually 401`s. Nice find and great thread! Not too often one finds something this unusual. Tom Mooney
donut364........... Yes, you are correct about the other nailhead stuff. Who has the d port heads, I'm assuming 2 heads, and how much? Marty
