383/388 Chevy stroker
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==GMPP HT383 crate engine== | ==GMPP HT383 crate engine== | ||
This engine was introduced in response to the wildly popular SBC 383 stroker engine made popular by backyard mechanics, machine shops, and later on the aftermarket. | This engine was introduced in response to the wildly popular SBC 383 stroker engine made popular by backyard mechanics, machine shops, and later on the aftermarket. | ||
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| + | It uses a 4-bolt block and Vortec iron heads with 1.94" x 1.5" valves and an aluminum dual plenum intake. | ||
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| + | It produces 340 HP @ 4500 rpm and It produces 435 ft/lb torque at 4000 rpm. | ||
===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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| + | ====Bore and stroke==== | ||
| + | *Bore is 4.00" instead of the usual 4.030" or 4.060" | ||
| + | *Stroke is 3.80" instead of the usual 3.75". | ||
====Rods==== | ====Rods==== | ||
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====Crankshaft==== | ====Crankshaft==== | ||
| − | *[http://www.summitracing.com/parts/nal-12489436 '''Crankshaft'''] is a quality, forged | + | *[http://www.summitracing.com/parts/nal-12489436 '''Crankshaft'''] is a quality, forged 4340 steel unit made for the 1-piece rear main seal configuration. It is externally balanced. 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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<tr><td style="background-color: rgb(230, 255, 255);">Part Number: </td><td style="background-color: rgb(230, 255, 255);">12499101</td></tr> | <tr><td style="background-color: rgb(230, 255, 255);">Part Number: </td><td style="background-color: rgb(230, 255, 255);">12499101</td></tr> | ||
<tr><td style="background-color: rgb(237, 243, 254);">Engine type: </td><td style="background-color: rgb(237, 243, 254);">Chevy small-block V8</td></tr> | <tr><td style="background-color: rgb(237, 243, 254);">Engine type: </td><td style="background-color: rgb(237, 243, 254);">Chevy small-block V8</td></tr> | ||
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<tr><td style="background-color: rgb(230, 255, 255);">Displacement (ci): </td><td style="background-color: rgb(230, 255, 255);">383</td></tr> | <tr><td style="background-color: rgb(230, 255, 255);">Displacement (ci): </td><td style="background-color: rgb(230, 255, 255);">383</td></tr> | ||
<tr><td style="background-color: rgb(237, 243, 254);">Bore x stroke: </td><td style="background-color: rgb(237, 243, 254);">4.00" x 3.80"</td></tr> | <tr><td style="background-color: rgb(237, 243, 254);">Bore x stroke: </td><td style="background-color: rgb(237, 243, 254);">4.00" x 3.80"</td></tr> | ||
<tr><td style="background-color: rgb(230, 255, 255);">Block (P/N 88962516): </td><td style="background-color: rgb(230, 255, 255);">Cast iron with 4-bolt main caps</td></tr> | <tr><td style="background-color: rgb(230, 255, 255);">Block (P/N 88962516): </td><td style="background-color: rgb(230, 255, 255);">Cast iron with 4-bolt main caps</td></tr> | ||
| − | <tr><td style="background-color: rgb(237, 243, 254);">Crankshaft (P/N 12489436): </td><td style="background-color: rgb(237, 243, 254);">4340 forged steel</td></tr> | + | <tr><td style="background-color: rgb(237, 243, 254);">Crankshaft (P/N 12489436): </td><td style="background-color: rgb(237, 243, 254);">4340 forged steel, externally balanced</td></tr> |
<tr><td style="background-color: rgb(230, 255, 255);">Connecting rods (P/N 12497624): </td><td style="background-color: rgb(230, 255, 255);">Heavy-duty powdered metal steel, screwed-in studs</td></tr> | <tr><td style="background-color: rgb(230, 255, 255);">Connecting rods (P/N 12497624): </td><td style="background-color: rgb(230, 255, 255);">Heavy-duty powdered metal steel, screwed-in studs</td></tr> | ||
<tr><td style="background-color: rgb(237, 243, 254);">Pistons (P/N 12499103):</td><td style="background-color: rgb(237, 243, 254);"> Hypereutectic aluminum, round dish w/4 valve reliefs</td></tr> | <tr><td style="background-color: rgb(237, 243, 254);">Pistons (P/N 12499103):</td><td style="background-color: rgb(237, 243, 254);"> Hypereutectic aluminum, round dish w/4 valve reliefs</td></tr> | ||
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<tr><td style="background-color: rgb(230, 255, 255);">Camshaft type (P/N 14097395): </td><td style="background-color: rgb(230, 255, 255);">Hydraulic roller</td></tr> | <tr><td style="background-color: rgb(230, 255, 255);">Camshaft type (P/N 14097395): </td><td style="background-color: rgb(230, 255, 255);">Hydraulic roller</td></tr> | ||
<tr><td style="background-color: rgb(237, 243, 254);">Valve lift: </td><td style="background-color: rgb(237, 243, 254);">0.431" intake/0.451" exhaust</td></tr> | <tr><td style="background-color: rgb(237, 243, 254);">Valve lift: </td><td style="background-color: rgb(237, 243, 254);">0.431" intake/0.451" exhaust</td></tr> | ||
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<tr><td style="background-color: rgb(230, 255, 255);">Valve size: </td><td style="background-color: rgb(230, 255, 255);">1.94" intake/1.50" exhaust</td></tr> | <tr><td style="background-color: rgb(230, 255, 255);">Valve size: </td><td style="background-color: rgb(230, 255, 255);">1.94" intake/1.50" exhaust</td></tr> | ||
<tr><td style="background-color: rgb(237, 243, 254);">Compression ratio: </td><td style="background-color: rgb(237, 243, 254);">9.1:1</td></tr> | <tr><td style="background-color: rgb(237, 243, 254);">Compression ratio: </td><td style="background-color: rgb(237, 243, 254);">9.1:1</td></tr> | ||
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<tr><td style="background-color: rgb(230, 255, 255);">Rocker Arms (P/N 10089648): </td><td style="background-color: rgb(230, 255, 255);">Stamped steel</td></tr> | <tr><td style="background-color: rgb(230, 255, 255);">Rocker Arms (P/N 10089648): </td><td style="background-color: rgb(230, 255, 255);">Stamped steel</td></tr> | ||
<tr><td style="background-color: rgb(237, 243, 254);">Rocker arm ratio: </td><td style="background-color: rgb(237, 243, 254);">1.5:1</td></tr> | <tr><td style="background-color: rgb(237, 243, 254);">Rocker arm ratio: </td><td style="background-color: rgb(237, 243, 254);">1.5:1</td></tr> | ||
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