Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

400 sbc build help

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Old Oct 24, 2012 | 06:10 PM
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blk86z28's Avatar
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From: duluth,mn
Default 400 sbc build help

hey guys i just got a low mile 400 sbc out of a van and was wondering if i put my vortec 906 heads and a comp xe 284 cam in it edelbrock air gap intake, 750 holley, how much power would i be looking at.........and possible 1/4 mile times in a 86 iroc-z
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Old Oct 25, 2012 | 02:24 PM
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Vortec heads will prolly bolt on 20 to 40 hp DONT forget to have the Steam Holes drilled in the heads for the 400!!!
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Old Oct 25, 2012 | 04:36 PM
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Make sure the Vortech heads chambers are compatible with your pistons - you don't want compression ratios way too low or way too high.

400 is a weird beast - it needs more cam than you might think and can use larger cc heads without total destruction of the bottom end. Vortech heads will give you a boatload of TQ if they don't screw up the compression...
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