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Old 07-10-2011, 08:52 AM   #1
shaulr
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What is the difference between a Stroker engine and a regular engine?

What is the defiance beet win a Stroker engine and a regular engine?
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Old 07-10-2011, 10:18 AM   #2
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A stroker engine will have more cubic inches than a "regular" engine. A stock 350 piston travel is about 3.48 inches (88.4 mm) and in a 383 cubic inch stroker crankshaft the piston travels about 3.75 inches (95.25mm). That raises the displacement of the engine from 350 to 383 cubic inches. Or about 5.7 liters to 6.3 liters. More size equals more power and especially torque.
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Old 07-11-2011, 10:39 AM   #3
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Also, stroking it requires a crankshaft with a larger distance between the rod connections and the crank shaft center, which increases the moment arm, and thus torque output. The increased stroke is an effect of this "larger" crankshaft.
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Old 07-11-2011, 02:01 PM   #4
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Cool

Good answers!
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Old 07-11-2011, 02:12 PM   #5
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A couple of good factory examples are the 327 vs 350 and the 427 vs 454.
Chevy took the 4" bore x 3.25" stroke 327 and added a 3.48" stroke crank to make the 350.
The same thing was done with 427 & 454 big blocks. Swap the 427's 3.76" stroke crank for a 4" stroke crank and you have a 454.
People dont call the 350 or 454 strokers because the factory made the change, but it is the same deal.
Common current day strokers are the 383s (4.030" bore x 3.75" stroke) mentioned above, & the 496 big blocks (4.310" bore x 4.25" stroke).
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Old 07-11-2011, 02:29 PM   #6
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Quote:
Originally Posted by Driveshaft View Post
A couple of good factory examples are the 327 vs 350 and the 427 vs 454.
Chevy took the 4" bore x 3.25" stroke 327 and added a 3.48" stroke crank to make the 350.
The same thing was done with 427 & 454 big blocks. Swap the 427's 3.76" stroke crank for a 4" stroke crank and you have a 454.
People dont call the 350 or 454 strokers because the factory made the change, but it is the same deal.
Common current day strokers are the 383s (4.030" bore x 3.75" stroke) mentioned above, & the 496 big blocks (4.310" bore x 4.25" stroke).
So, if you have let's say an L-82, (350) and you wanted to stroke it, would you also have to bore over 0.03 and increase the crank to 3.75"? Effectively a "double stroked" 327?
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Old 07-11-2011, 02:31 PM   #7
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The bore isnt required, but most engines could use the boring by the time they are rebuilt.
FYI (just for fun)
Std bore = 377
.030" over = 383
.040" over = 385
.060" over = 388"
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Old 07-11-2011, 02:57 PM   #8
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Most engines have an easy 10ci to be found by offset grinding the crank and using extra-thick bearings or a rod with a smaller bearing on the big end. That's old-school stroker dating back to the dawn of hot rodding.

A person can de-stroke an engine for higher revs, typically only useful for a rule restricted race car. Which is why the 302 chevy is often called a factory destroked 327. The street version was only offered to homologate a trans-am racer with a 5L displacement rule and never offered elsewhere in the chevy lineup.

There are many ways to skin a mule, but stroking or destroking is changing the piston stroke to something the manufacturer did not offer. A 327 stroked with a 350 crank is not a stroker. It's a 350.
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Old 07-12-2011, 11:43 AM   #9
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Quote:
Originally Posted by shaulr View Post
what is the defiance beet win a stroker engine and a regular engine?

$money$
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Old 07-12-2011, 11:55 AM   #10
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The stroking.

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Old 07-13-2011, 05:30 AM   #11
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Quote:
Originally Posted by Driveshaft View Post
The bore isnt required, but most engines could use the boring by the time they are rebuilt.
FYI (just for fun)
Std bore = 377
.030" over = 383
.040" over = 385
.060" over = 388"
I have the 385. Go for the stroker engine, you won't be disappointed. If you are rebuilding and have a 2 bolt main block, you may want to upgrade to a 4 bolt main.
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Old 07-13-2011, 06:08 AM   #12
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Quote:
A person can de-stroke an engine for higher revs, typically only useful for a rule restricted race car. Which is why the 302 chevy is often called a factory destroked 327. The street version was only offered to homologate a trans-am racer with a 5L displacement rule and never offered elsewhere in the chevy lineup.
That's one of my favorite engines. They were rated at 290 HP @ 5800 RPM. While that may have been a little low at 5800 the engine made max power somewhere north of 7000 rpm. Most dyno's back in the day had that little solid roller mouse hitting 350 to 400 horsepower at something approching 7200 RPM. It depends on whose dyno you believe.
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Old 07-14-2011, 06:32 PM   #13
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Just in case you needed more info....

http://www.corvettefaq.com/c3/dpg/part1.htm
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