DynoSim combinations
m (→355 SBC street motor, budget build: minor clean up) |
(Clean up) |
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===355 SBC street motor, budget build=== | ===355 SBC street motor, budget build=== | ||
| − | *Block: '68-'86 Chevy 350 Gen I bored +0.030". Check main bearing bore for round and parallel, align | + | *Block: '68-'86 Chevy 350 Gen I bored +0.030". Check main bearing bore for round and parallel, align hone or align bore, as necessary to correct the bores and insure they are ''round''. Once the mains are valid, register the block on the main saddle and cut the block decks to square the block up and set the squish where you want it. Don't try to cut corners here, this lays the foundation for the work and parts to come. |
*Crank: Stock 350, 3.48" stroke, 2.450" main journal diameter. | *Crank: Stock 350, 3.48" stroke, 2.450" main journal diameter. | ||
| − | *Rods | + | *Rods: [http://www.competitionproducts.com/Custom-Rebuilt-GM-Rod-Chev-350-LJ/productinfo/804335/ Rebuilt rods]. If using an existing set of stock rods, ARP hardware and resizing is recommended. |
**Scat makes a decent set of [http://www.summitracing.com/parts/SCA-25700P/ 5.7" forged rods] that are affordable. | **Scat makes a decent set of [http://www.summitracing.com/parts/SCA-25700P/ 5.7" forged rods] that are affordable. | ||
*Pistons: [http://www.kb-silvolite.com/kb_car/performance.php?action=details&P_id=155 Keith Black hypereutectic], p/n KB193, 12cc D-cup, 5/64,5/64,3/16 rings. 1.561" compression height. Gap top ring 0.026", second ring 0.018". | *Pistons: [http://www.kb-silvolite.com/kb_car/performance.php?action=details&P_id=155 Keith Black hypereutectic], p/n KB193, 12cc D-cup, 5/64,5/64,3/16 rings. 1.561" compression height. Gap top ring 0.026", second ring 0.018". | ||
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.700 257 185<br> | .700 257 185<br> | ||
| − | *This uses a 350 block bored to size, a 3.750" stroke crank and 5.7" rods. Scat makes a cast crank and capscrew I-beam rods that will work here. Have your machine shop | + | *This uses a 350 block bored to size, a 3.750" stroke crank and 5.7" rods. Scat makes a cast crank and capscrew I-beam rods that will work here. Have your machine shop sonic test the cylinder walls for thickness if the bores need to go more than 0.030" over. Smokey Yunick used to recommend a minimum cylinder wall thickness of 0.135" after boring and honing. |
*Heads: Racing Head Service Pro Action 180, 72cc chambers, 2.02" intake, 1.60" exhaust. | *Heads: Racing Head Service Pro Action 180, 72cc chambers, 2.02" intake, 1.60" exhaust. | ||
*Pistons: Keith Black hypereutectic #KB134, 7cc flat-top, 5/64/5/64/3/16 rings, 1.433" compression height. | *Pistons: Keith Black hypereutectic #KB134, 7cc flat-top, 5/64/5/64/3/16 rings, 1.433" compression height. | ||
| − | *Intake manifold: Dual | + | *Intake manifold: Dual plane, highrise such as the Edelbrock RPM, Weiand Stealth or Professional Products Typhoon. |
*Carburetor: 850 cfm vacuum secondary. | *Carburetor: 850 cfm vacuum secondary. | ||
| − | *Headers: 1-3/4" primaries, long-tube | + | *Headers: 1-5/8" to 1-3/4" primaries, long-tube. Install "X" pipe between collectors and mufflers. Run 2-1/2" to 2-3/4" pipe to the rear through mufflers of your choice. |
*Camshaft: [http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=79&sb=0 Comp cams 12-212-2 Comp Cams hydraulic flat tappet], installed 2 degrees retarded. | *Camshaft: [http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=79&sb=0 Comp cams 12-212-2 Comp Cams hydraulic flat tappet], installed 2 degrees retarded. | ||
*Rocker arms: 1.6, lift at valve 0.512". | *Rocker arms: 1.6, lift at valve 0.512". | ||
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===350 SBC L31 heads=== | ===350 SBC L31 heads=== | ||
| − | Flat tappet hydraulic cam, stock | + | Flat tappet hydraulic cam, stock self aligning (SA) rockers, some head work for better springs. |
| − | In this build, a tight budget is | + | In this build, a tight budget is called for. To that end, use stock self aligning rockers. Lift is under a half inch, so the SA rockers should be OK. Check to see if using a -0.050" lock will be needed to insure the valve tip sticks up far enough above the retainer so that the retainer top surface doesn't get loaded by the side rails of the rail rockers. More on checking clearances, etc. under '''Resources''', below. |
*Bore the block 0.030", use [http://www.kb-silvolite.com/test/kb_car/performance.php?action=details&P_id=155 '''these'''] or similar 12cc dished pistons w/5.7 rods. | *Bore the block 0.030", use [http://www.kb-silvolite.com/test/kb_car/performance.php?action=details&P_id=155 '''these'''] or similar 12cc dished pistons w/5.7 rods. | ||
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