Ok, now you want to change your answer ? You argued that the 347 wouldn't last as long as a 331. Now you say it will, but the difference in mileage obtained doesn't concern you. You can't have it both ways. I don't need to show calculations to prove what I said. Just the piston speed difference alone tells you that the 347 will wear the bores and pistons faster, not to mention the piston rock stresses at BDC are greater. It's not only physics, but plain old common sense that will illustrate to anyone which has the shorter lifespan.
Well I'm right at this decision now. My first motor, stock, original short block. Edelbrock RPM heads,(190/160). Comp cams 280H ,650hp carb. Good C4,with kit and adjustable modulator valve. 3800 convertor and 380 spooled rear.Torque gets you outta the hole and rpm at the end. Couldn't get my 60 fts below 2.0.This was a great combo for the street, but not enough for the 1/4 mile for me. Now building a 347,main girdle,forged pistons(10.5), forged rods and crank. custom ground cam, afr heads,built C4, 4800 stall. NO POWER ADDERS. Am told once its tuned in and gettin hooked up, should be in high 10s or lower 11s. We will see. maybe not as im a big guy. car should be around 3200 with full fuel and me.
You're confused, go back and re-read the thread. I never changed anything. I stand behind my original ideas. The 347 will last just as long as a 331 if built properly w/ all the proper machining. My personal opinion is that you are over thinking and over analyzing something that doesn't deserve it. You can talk about piston speed, rod angularity and blah.. blah...blah....i'm more into the practical application.
Not down here. More stress = more heat= more wear + metal fatique. If starting with an aftermarket New block, like a Dart, Id have no argument against a 347 Zero balanced forged crank. Most of the guys Ive talked to, even my engine builder(who races) are skeptical at best about going 347 with a stock 302 block without a nice girdle and some serious aftermarket main caps with H beam rods. Why not go with a 351W? Girdles are for Fat chicks, Only Bikinis here in AZ.
I'm not confused. You are. I did reread what you've posted here. You said it was a myth, then you said there was a difference. Which is it ?
Lets see some of your work. Why is it that blowhards like you think everyone else is some kind of neophyte if they don't do this for a living ? Or they don't have standings in the record books ? I don't have anything to prove to you. I'm not the one who feels the need to constantly challenge everyone else's competency. I have no superiority complex like you obviously do. All that aside, I've seen some of the nicest work come from the shops of guys who are NOT professionals.
I didn't say there was a difference, I made a "for the sake of argument" statement that was an "attempt" to prove my point. I guess you missed that? If you are so worried about that extra 2000 miles, build the 331 stroker, I'll build the 347 and we'll both be happy. BTW, I was always very happy w/ my 347 until the block cracked. The weak point of "most" performance,stock blocked ,302 stroker motors is the block. So the "this one will last longer" argument never holds water w/ me. I guess we will just agree to disagree.
Hey daydreamer, if you haven't already bought your crank I wouldn't waste the money on a forged unit. The crank will be far stronger than the stock block and there's no point in that. The cast stroker cranks are still stronger than a stock block and much cheaper and lighter than a forged crank.
