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Ron1 · 12-21-2002, 12:41 AM

I picked this up on one of the other sites...maybe even here...

Originally posted by George Klass, CHP
"This rod/stroke ratio stuff is really not that big a deal for high end street racer type engines. How many of you older guys remember the old Ford 292 inch Y-Block engine? Generally considered a piece of crap; not much performance and not a very long lasting beast, either. Rod/stroke ratio? 1.91:1. Here are a few engines with their rod/stroke ratios: 454 Chevy - 1.53:1, 455 Pontiac - 1.58:1, 428 Ford Cobra Jet - 1.63:1, Ford SB 331 Stroker - 1.60:1, Ford SB 347 Stroker - 1.58:1, etc. The most important rod/stroke ratio to be concerned with for most street/strip racers is 8:1. Eight rods to one crank. As far as displacement is concerned, here is something to contemplate. NHRA penalizes displacement in all Comp Eliminator classes (weight to cubic inches). Now, why do you think that is? If bigger inch engines didn't have more HP potential, somebody needs to tell NHRA. There is nothing wrong with a 331 OR a 347. Take your pick. But don't get stuck with all this "theory" (side loads, rod/stroke, rod angles, etc.)"

(Quote)
Originally posted by George Klass
What follows is not an opinion, however. A CHP 347 Street Fighter will last as long or longer than a 331 or a 302. This is because of the exclusive oil control feature (discussed elsewhere on this board). Does anyone really think that a 260 or 289 will last longer than a 302?

(Quote)
Originally posted by George Klass
I have read all of the interesting and logical (and not so logical) reasons for choosing a 331 over a 347, and everyone of those reasons could apply to choosing a 289 over a 302. Which would you choose?

Just FYI

Ron

12-21-2002, 12:41 AM	#46
Ron1 Registered Member Join Date: Sep 1999 Location: Vancouver, WA USA Posts: 439	I picked this up on one of the other sites...maybe even here... Originally posted by George Klass, CHP "This rod/stroke ratio stuff is really not that big a deal for high end street racer type engines. How many of you older guys remember the old Ford 292 inch Y-Block engine? Generally considered a piece of crap; not much performance and not a very long lasting beast, either. Rod/stroke ratio? 1.91:1. Here are a few engines with their rod/stroke ratios: 454 Chevy - 1.53:1, 455 Pontiac - 1.58:1, 428 Ford Cobra Jet - 1.63:1, Ford SB 331 Stroker - 1.60:1, Ford SB 347 Stroker - 1.58:1, etc. The most important rod/stroke ratio to be concerned with for most street/strip racers is 8:1. Eight rods to one crank. As far as displacement is concerned, here is something to contemplate. NHRA penalizes displacement in all Comp Eliminator classes (weight to cubic inches). Now, why do you think that is? If bigger inch engines didn't have more HP potential, somebody needs to tell NHRA. There is nothing wrong with a 331 OR a 347. Take your pick. But don't get stuck with all this "theory" (side loads, rod/stroke, rod angles, etc.)" (Quote) Originally posted by George Klass What follows is not an opinion, however. A CHP 347 Street Fighter will last as long or longer than a 331 or a 302. This is because of the exclusive oil control feature (discussed elsewhere on this board). Does anyone really think that a 260 or 289 will last longer than a 302? (Quote) Originally posted by George Klass I have read all of the interesting and logical (and not so logical) reasons for choosing a 331 over a 347, and everyone of those reasons could apply to choosing a 289 over a 302. Which would you choose? Just FYI Ron