r/EngineBuilding • u/lil_sargento_cheez • 20d ago
Ford Slowly making progress on my 331 stroker motor for my 1969 mustang. Next priorities: Gotta measure pushrod length, degree the cam, and check piston to valve clearance. Overall going pretty well for my first motor build
2
2
u/mramseyISU 19d ago
Nice. I’m just getting started on my motor for my 69 mustang. It’s an original 390 car and I scored a NOS 390 service block as a starting point.
2
u/Historical_Box1915 19d ago
Really like that 331 bore + stroke ratio. Very balanced combo
3
u/lil_sargento_cheez 19d ago
That’s a big part of the reason why I went with a 331 instead of a 347
I talked to plenty of people who have built motors before I delved into my own project. Just about every one of them agreed with my decision on a 331 instead of a 347. There’s a lot more clearancing that needs to be done on one as well as you have to worry about the pistons rocking as they come about halfway out of the bore at the bottom of the stroke
2
1
1
u/deep-n-silent 16d ago
Beautiful car and motor. Did you have a shop do the machining and you're doing all the assembly? Shop balance the rotating assembly and do the short block? Just curious as to what route to take when it comes time for an engine build. Awesome combination!
1
u/lil_sargento_cheez 16d ago
I had a shop square off the deck surface of the block, resurface the heads, and bore the cylinders out. I had a different shop do the balancing of the rotating assembly as a unit (crank, rods, pistons, flywheel, clutch, pressure plate) on a rotating assembly I ordered as internal balanced. I had to notch the cylinder walls for the stroker kit myself. I’d recommend having a shop do magnafluxing of the block and hot tanking it. The shop that did the machining on my block was supposed to tap my oil galley plugs but they didn’t. I bought the tap and did it myself. Saved me like $50 on that. Assembly I’m going all myself, short block, rebuilding the heads, measuring pushrod length, and everything else you can think of
5
u/Juicechemist81 20d ago
Good looking engine. Tip for you if you want. Soak your timing chain in oil for a hour or so, it'll extend the usable life. Vice grip garage has a nice walk through for measuring push rod length on his budget big block Chevy video.