I have a 383 sbc in my Impala. Here's the stats: 350 4 bolt block, cast turned down 400 crank, 5.7 rods, cast TRW pistons, 9.87:1 compression. Iron '186' heads, 64 cc, 2.02/1.60 valves, gasket matched both intake and exhaust, bowl blending, some exhaust port work and general casting cleanup. Comp Cams XE274, 487/490 lift, 230/236 dur. @ .050, 1.5 roller rockers, 'Z-28' valve springs. Edelbrock RPM intake, Quick Fuel 750 DP carb, HEI dist, MSD 6AL, MSD coil, Autolite 26 plugs, Taylor wires. Hedman 1 5/8 headers, 2 1/2 pipes, flowtech terminators muffs. 10 bolt posi 3.36 gears.
The car ran a best of 14.61 at 95.29 mph at Sac Raceway about a month ago. I'm thinking something is missing. I'm pretty good at tuning for street driving. This car runs all day in the heat on 89 octane and near 10:1 compression, but I believe there should be more out this combo on the track. I believe that my heads are the weak point. 1970 LT1 double hump castings are a bit outdated. I have also been thinking that I need to put it on a chassis dyno to find more.
What do you guys think?
The car ran a best of 14.61 at 95.29 mph at Sac Raceway about a month ago. I'm thinking something is missing. I'm pretty good at tuning for street driving. This car runs all day in the heat on 89 octane and near 10:1 compression, but I believe there should be more out this combo on the track. I believe that my heads are the weak point. 1970 LT1 double hump castings are a bit outdated. I have also been thinking that I need to put it on a chassis dyno to find more.
What do you guys think?
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