A friend of mine with a 302 comet just added a stroker crank in a standard bore 302, with no other internal upgrades, what would be the out come of the engine?
Just figure I ask , because a friend of mind just added a stroker crank alone in his 302 comet...I was telling him that it probably will do internal damage to his engine. I was posting to get conformation.
If he just put in a stroker crank, and no other changes were made, the pistons will stick out of the bores by a mile...depending on the actual stroke of the crank. If it's a 331 crank, the pistons will stick out about .125" give or take. There aren't many stroker 302 cranks left out there that don't use Chevy journals...so ask your buddy if it's got Ford rod journals or Chevy rod journals. Chances are good that he won't know and then you can either call BS or tell him that it ain't done right. If it's a 347 crank the pistons will stick out about .200". Either way, the piston will likely hit the heads before it ever makes one full revolution. Then you can kiss the heads, pistons, valves and rods goodbye. Just adding the crankshaft alone will not work. It'll probably physically fit just fine in the block but the 302 rods use different journal sizes (normally) and even if it did run, it wouldn't have any oil pressure because there would be about .025" oil clearance between the rod bearing and crankshaft journal. Also the pistons will hit everything. Ask him if he clearanced the block and what stroke length he used. They make 316", 331", 347", and 355" stroker cranks. The 316 is a 3.100 stroke, 331 is a 3.250" stroke, 347 is a 3.400" stroke and the 355 is a 3.480" stroke (usually).
A 331 stroke length, I guess I better show him this thread to give him proof that his idea was dumb with factory upgrades.
stroker pistons are usually shorter than stock so they dont stick out of the piston hole is basically the simple answer. also the block needs to be clearanced.
Now I'm asking on my behalf can I install a stroker kit in my 302 Maverick with basic auto supplies; or will it all have to be done by a professional machine shop?
Judging by your questions I assume you have never built an engine before. I strongly suggest a professional or find someone that knows what they are doing to assist you every step of the way. An engine is not something you can just slap together with no knowledge and expect it to run perfect. There are way too many things that need to be done while building it. Good luck
The bore size has absolutely nothing to do with whether or not a stroker crank will work in a block. And the statement that most stroker cranks for small block Fords have Chevy rod journals just isn't true. Better read up on your facts first. The 331 stroker kit I used has Ford sized journals as do most others. And I've never run across a "355" stroker kit for a small block Ford. That's a stock stroke Chevy crank not a small block Ford stroker crank. There's more to it than just buying a crank to building a stroker motor. Some 351W based strokers use the stock 351W rods but these are the exceptions, not the rule.
So if the 302 bottom end is just refreshed with new seals, bearings, etc., and the top end is worked over, how long could that motor last and estimating how much power could it produce?
