I was reading on a website that you can stroke a 401/425 by using 364 rods. Is this true and if so stroke it to what?
Do a search, I asked the same question on here. Should be back a few pages. Might be gone to when the server barfed. This one could disappear, it seems that every time I reply, the post disappears.
in order to change the stroke in an engine you have to modify the crankshaft in some form or another. just changing rods will only change compression not stroke. Bob
I almost had that done to mine, but I got scared when they told me the oil galleries have to be cut and oil feed lines have to be installed. Also, I hear the rod bearings are scarce being so thick. At that point, it was no longer an option for me.:bglasses:
The 364 rods are 1/8" shorter than the 401/425, and use the SAME bearing. This allows you to offset grind the crank 1/8" (after welding) producing a stroke increase of 1/4", and use the stock 401 or 425 piston. I don't remember the displacement increase, but it's substantial. Thanks Tom Ivo!!!
I just did the math (yeah, I'm that bored) and if you increased the stroke by a quarter inch on the 401 it becomes a 429 and the 425 amazingly becomes a 455.
Carmen told me that you could use Pontiac rods. He is also the person who said that as opposed to having the journals welded, you would use 1/8" thick rod bearings. I wonder how much life expectancy you could get from a Nailhead stroker? That was why I decided to keep mine stock.:bglasses:
Lou, I can try, dunno if it'll work. :grin: I'm not sure he has the same username here, in fact I seriously doubt it, but there's a fellow on here that has a Paxton (I think) supercharged Rivi. His name is Terry, but I know him better on a different board as 38Chevy454. Maybe he'll respond to this post, and we can get some info on how his car's set up.
Fraz, yes I usually go by 38Chevy454, but on here I use blown nailhead since it's Buick. My engine is a 401 with actually later model Buick 455 rods, which are LONGER than stock 401 rods. My crank is stock, not stroked. Pistons of course are custom.
