It’s Winter. Let’s discuss strokers. How much faster

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pittsburghracer

pittsburghracer

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I’m curious as to why almost 80% of Mopar guys suggest strokers over stock crank builds. How much quicker do you think they are? Let’s hear your guesses.
 
Same heads, cam, intake, carb, and bore.... there is really no more HP, is there ??? :realcrazy:
 
Stroke.....&/or....bore. Both increase cubic inches which increases torque. I don't there is any 'guess' about it that more cubes makes a car quicker, all else being equal.
 
No substitution for cubic inches ?? That's the old proverb. Less stroke means more converter/gear ?? converter and gear the equalizer ??
 
pittsburghracer said:
I’m curious as to why almost 80% of Mopar guys suggest strokers over stock crank builds. How much quicker do you think they are? Let’s hear your guesses.
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Because 80% of engines built go in street cars and never see above 5500rpm where the heads begin to choke em. But if you build 408 cubes and put 280cfm heads on it vs 360 cubes and put 280cfm heads on it but never turn either one more than 5500 or so, yea the 408 will be quicker. Most people are scared to turn the rpm it takes to make power with less cubes. My opinion anyway.
 
For my example I will be comparing a 408 to a 360 with both being a .030 over 360 block. Same car, converter, and 4:10 rear gear. Same heads (ported Edelbrock) 360 with a .620 roller and 408 had a .660 roller. 6700 shift rpm for both.
 
426 Mopar 4.25 x 3.75 over a 428 Pontiac 4.00x4.00.
 
pittsburghracer said:
For my example I will be comparing a 408 to a 360 with both being a .030 over 360 block. Same car, converter, and 4:10 rear gear. Same heads (ported Edelbrock) 360 with a .620 roller and 408 had a .660 roller. 6700 shift rpm for both.
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Well....
 
There are so many trade offs with engineering. I find it hard to have a fair comparison but what PBR is doing will be fun.
 
In the power nation stroker vid that was posted here recently shows a 30 some horsepower increase in the stroker. Is that not a significant enough amount?
 
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To make 500 HP the 360 requires 1.38 Hp per CI, the 408 only 1.22 Hp per CI.

Easier to pick low hanging fruit than to build higher efficiencies.
 
If it makes more torque, it has to make SOME more horsepower. HP=torque x RPM. The most rpm limiting component on the sbm are the heads.
 
ch1ll said:
If it makes more torque, it has to make SOME more horsepower. HP=torque x RPM. The most rpm limiting component on the sbm are the heads.
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Not for this guy:

I picked up 80+ HP going from a 367 to a 418. Same junkyard heads with a little more port work and the same baby flat tappet camshaft. .590, .590, 276*, 276*. Quickest with 367 was 10.25 at 129.99 and the 418 quickest pass was 9.68 at allmost 136 mph. And it does this with the 418.
byronwheelstand.jpg
 
Most people that put them down haven't had one (stroker..)
Most people that have one couldn't imagine going back...
 
I would think a stroker in a street application would definitely shine... in a drag car, I've seen such small cubic inch engines just rip past huge cubes. I think the entire combo of the car plays such a big part.
 
Also, not a mopar but.... the LS guys often destroke the engine to go faster. Some of them turning 8500 rpms....
 
318willrun said:
I would think a stroker in a street application would definitely shine... in a drag car, I've seen such small cubic inch engines just rip past huge cubes. I think the entire combo of the car plays such a big part.
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With your experience with the 318, would you stroke a 318 to a 349? If so, is there a particular stroker kit that you would use?
 
pittsburghracer said:
I’m curious as to why almost 80% of Mopar guys suggest strokers over stock crank builds. How much quicker do you think they are? Let’s hear your guesses.
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With the right head/induction? A lot.
A head can seem big n roomy for small CID and limiting to much a larger cid... but a careful selection of parts can make them work exceptional within a parameter. ..but just having the right head to start and the right parts...gonna be winner.
Regardless...nothing can be the same ..in order to give each a fair shake.imo..otherwise we are merely testing parts capabilities/flexibilities. Jmo
 
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Dan the man said:
Something to think about
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i have, and its been done, thought bout off set grinding the 318 crank too, figure the machine shop bill and think bout it!! dollars ahead just building the 360,..now going 4 inch stroke,.thats adds up better!! but 4 inch bores only makes that better too! figure it any way you want to it dont matter,..DWB
 
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