I used to talk to Bill on a regular basis before he passed. I know he did not like the aluminum blocks at all. Even the cylinder heads. Those blocks have a lot of porosity in them just not compact enough. On the dyno your looking at a 10-12% loss
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70 LS 6 4 SPEED CHEVELLE
69 SS 396/375 HP 4 SPEED CHEVELLE
68 SS 396 CHEVELLE SS 396/375 4 SPEED
69 COPO CHEVELLE 4 SPEED #S MATCH
69 COPO CAMARO #S MATCH SURVIVOR (BLACK)
69 COPO CAMARO (BLACK)
55 GASSER L88 4 SPEED
66 NOVA "UNDER CONSTRUCTION"
70 440 SIX PAK CHALLENGER SUPER STOCKER
2001 RVW/LDR TRANS AM 1020" BBC 8 SYSTEMS
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