383/388 Chevy stroker
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==Overview== | ==Overview== | ||
A 383 is a 350 block bored +0.030" with a 3.750" crank. A 388 is a 350 block bored +0.060" with a 3.750" crank. The 383/388 SBC stroker has become one of the most popular engines in the history of the small block Chevy. The only engine that surpasses it in volume is the production 305 and 350 SBC. | A 383 is a 350 block bored +0.030" with a 3.750" crank. A 388 is a 350 block bored +0.060" with a 3.750" crank. The 383/388 SBC stroker has become one of the most popular engines in the history of the small block Chevy. The only engine that surpasses it in volume is the production 305 and 350 SBC. | ||
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===Differences=== | ===Differences=== | ||
While the HT383 is not that different than many SBC engines, the differences are important ones: | While the HT383 is not that different than many SBC engines, the differences are important ones: | ||
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| + | ====Rods==== | ||
*[http://www.gmpartsdirect.com/performance_parts/2012/ChevroletPerformance_Catalog_2012193.html '''Rods'''] are powdered metal with a pressed pin, but are clearanced for a stroker application. The retaining hardware consists of a threaded tapered stud in the rod (giving added clearance between the rods and the cam, etc.). This is different than the usual bolt and nut used on most other engines. Said to be good to 550 HP. | *[http://www.gmpartsdirect.com/performance_parts/2012/ChevroletPerformance_Catalog_2012193.html '''Rods'''] are powdered metal with a pressed pin, but are clearanced for a stroker application. The retaining hardware consists of a threaded tapered stud in the rod (giving added clearance between the rods and the cam, etc.). This is different than the usual bolt and nut used on most other engines. Said to be good to 550 HP. | ||
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| + | ====Crankshaft==== | ||
*[http://www.summitracing.com/parts/nal-12489436 '''Crankshaft'''] is a quality, forged 4140 steel unit made for the 1-piece rear main seal configuration. Instead of the usual 3.75" stroke, it is a 3.8" stroke, so the displacement will still be 383 ci, but with a 4" bore block. Chevy saw no reason to bore out a new block just so a 3.75" crank could be used. | *[http://www.summitracing.com/parts/nal-12489436 '''Crankshaft'''] is a quality, forged 4140 steel unit made for the 1-piece rear main seal configuration. Instead of the usual 3.75" stroke, it is a 3.8" stroke, so the displacement will still be 383 ci, but with a 4" bore block. Chevy saw no reason to bore out a new block just so a 3.75" crank could be used. | ||
**This crank in a 0.030" over block gives a displacement of 388ci. | **This crank in a 0.030" over block gives a displacement of 388ci. | ||
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| + | ====Pistons==== | ||
*[http://www.summitracing.com/parts/nal-12499103 '''Pistons'''] are a letdown. They're the same old tired, cheap-to-make 4 valve relief, pressed pin, round dish pistons GM has been foisting off on the public since years ago when the drop in CR was mandated. These pistons have no redeeming qualities, unless you consider the aluminum alloy being hypereutectic a plus. | *[http://www.summitracing.com/parts/nal-12499103 '''Pistons'''] are a letdown. They're the same old tired, cheap-to-make 4 valve relief, pressed pin, round dish pistons GM has been foisting off on the public since years ago when the drop in CR was mandated. These pistons have no redeeming qualities, unless you consider the aluminum alloy being hypereutectic a plus. | ||
**The HT383 pistons give a 9.1:1 CR with a 0.028" thickness head gasket and the Vortec chamber size of 64cc. | **The HT383 pistons give a 9.1:1 CR with a 0.028" thickness head gasket and the Vortec chamber size of 64cc. | ||
**Chevy shoots for a 9.0" stack of parts for SBC engines. Using a 9.025" block deck height, 3.8" stroke, and 5.7" rods, the piston CH would need to be 1.4” for the stack to equal 9” (1.9 + 5.7 + 1.4 = 9.0). | **Chevy shoots for a 9.0" stack of parts for SBC engines. Using a 9.025" block deck height, 3.8" stroke, and 5.7" rods, the piston CH would need to be 1.4” for the stack to equal 9” (1.9 + 5.7 + 1.4 = 9.0). | ||
| − | **It appears the head gasket is 0.028" thick | + | **Using the quench distance of 0.053", a piston dish size of 22cc would be about right for a 9.1:1 CR. To arrive at a quench of 0.040" requires a 24cc dish. |
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| + | ====Head gasket==== | ||
| + | *It appears the head gasket is composite and 0.028" thick. The CR is advertised as 9.1:1. | ||
**A 0.028" gasket using the numbers above will give a quench distance of 0.053". To bring the quench down to 0.040" would require a piston CH of about 1.413" (or a head gasket thickness of 0.015"). | **A 0.028" gasket using the numbers above will give a quench distance of 0.053". To bring the quench down to 0.040" would require a piston CH of about 1.413" (or a head gasket thickness of 0.015"). | ||
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===HT383 technical specifications=== | ===HT383 technical specifications=== | ||
<table> | <table> | ||
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*[http://www.kb-silvolite.com/kb_car/performance.php?action=search&mfg=Chevy&EngSize=383&RodLen=5.7 KB pistons for a 5.7" rod SBC 383 stroker] | *[http://www.kb-silvolite.com/kb_car/performance.php?action=search&mfg=Chevy&EngSize=383&RodLen=5.7 KB pistons for a 5.7" rod SBC 383 stroker] | ||
*[http://www.kb-silvolite.com/kb_car/performance.php?action=search&mfg=Chevy&EngSize=383&RodLen=6 KB pistons for a 6" rod SBC 383 stroker] | *[http://www.kb-silvolite.com/kb_car/performance.php?action=search&mfg=Chevy&EngSize=383&RodLen=6 KB pistons for a 6" rod SBC 383 stroker] | ||
| + | *[http://www.gmpartsdirect.com/ GM parts], one of many sources | ||
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[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:GM]] | [[Category:GM]] | ||
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