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Old 02-13-2013, 04:33 AM
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mild bbc build for 4x4.?

about to break down 454 on a budget looking for low end torq. any suggestions: cams, heads(prolly peanut ports/oval), pistons, compression,ignitions, anything would help. P.S. its a 70 blazer with 12in lift dana 60 14 bolt matching 456 gears and 38in boggers. also tranny info is good TH400.? im very open for ideas and need knowledge before i start thanks.

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Old 02-13-2013, 05:04 AM
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Use around 8.75:1 cr. Hyper pistons, 1/8 dome on the 120cc heads
120cc heads: 781 049 or 112cc head: 820 heads
Full length headers are very important for torque on a bbc.
A summit cam in the 210 to 212 degree range (at 0.050) on the intake with 110 lsa

I like the regular rpm intake with a holley 3310. But the stock intake will make more power under 3000.

Set up the mains and rod bearing clearance at 0.0015 to 0.0020 and the rear main at 0.0025-0.0030. BBC's require tight clearances to maintain oil pressure at idle.

Ignition timing: 15 initial and 40 total, then add another 10 degrees from an adjustable vacuum advance canister connected to a manifold source. So it will idle at 25 (15 + 10).

Should make 400 hp and 500 ftlb of torque and idle smoothly.
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Old 02-13-2013, 07:38 AM
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Thanks a bunch ill take that into consideration.
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Old 02-13-2013, 08:19 AM
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I bought a 1980 Camaro from a guy that built a 454 LS-5 for it.It had a .500 lift hydraulic flat tappet,performer and a quadra-jet with hooker headers.very similar to what 454c10 described.
It was a tire melter and made power to about 5,000 rpm.
It was fine as it was,but I had to improve it later,,,,,,,
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