383/388 Chevy stroker
m (→Quench) |
(→GMPP HT383 crate engine: minor clean up) |
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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 | + | This engine was introduced in response to the wildly popular SBC 383 stroker engine made popular by backyard mechanics, machine shops, and later in the aftermarket. |
It uses a 4-bolt block and Vortec iron heads with 1.94" x 1.5" valves and an aluminum dual plenum intake. | 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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====Pistons==== | ====Pistons==== | ||
| − | + | The HT 383 [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. | |
| − | ** | + | |
| − | **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). | + | What is known about these pistons: |
| − | **Using the quench distance of 0.053", a piston dish size of | + | *They're hypereutectic aluminum alloy. |
| + | *They 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). The actual compression height of the HT383 piston is presently unknown. | ||
| + | **Using the quench distance of 0.053", a piston dish size of 21cc would be about right for a 9.1:1 CR. A 9.1:1 compression ratio using a quench of 0.040" will require a 24cc dish. | ||
====Head gasket==== | ====Head gasket==== | ||
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===HT383 technical specifications=== | ===HT383 technical specifications=== | ||
| − | <table> | + | <table border="1" cellpadding="2" cellspacing="0" > |
<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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