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Old 04-02-2016, 12:25 PM   #20
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Join Date: Sep 2008
Location: San Carlos, Ca.
Posts: 2,604
Re: L29 454 Build for '63 K15 with NV4500

Just a question. 9 - 9.5 CR puts the engine in the 91 octane range right? I keep reading that the sharp edges of the Vortec heart shape chambers lend themselves to pre ignition or detonation above 30-32 deg. advance. Raising the CR may make it worse? My budget says stock cast iron but little voice says aluminum heads. There's a set of new Pro Comps on CL for 950 although I haven't heard a lot of good things about them. Theres also a set of new, assembled Race Rite ovals close by for 1800 (gulp) which deep down Im thinking might be the right way to go. Which brings me to another question. I have heard that just having aluminum heads brings better cooling and reduced detonation. Is this true and on average, how much could the CR be raised by using aluminum vs cast iron?

'63 k15 long step
Vortec 7.4 - L29 Blackbear tune, Five 0 Motorsports injectors, Chris Straub Cam, NV4500, divorced 205
52" front and 63" rear spring swap
D44 / 14bff - disc axles
Milemarker 9K and 10.5K hydraulic winches

63" & B52 Spring Install

NV4500 Reverse Build Thread

L29 - 7.4 Vortec Build
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