Did I over cam my 408 for the street?

jake17201 said

Im having a 408 built for my duster. Specs are:
408 cast kit, dished pistons, 10:1, edelbrock heads, hydraulic flat tappet 240 245 @ .050 on a 112lsa. RPM air gap, holley 750. This is going into a full weight street car with 3.55 gears and a 2500 converter.

I was hoping for a strong good sounding idle that wasn't a bear to tune. Thoughts? Thanks

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I think you'll be fine with the torque of the 408 with that cam, But, the 2 things i'd change are the gears/converter, I'd go with at least a 28-3000 stall & 3.91s & run a 28" tire. Even 4.10s would be nice for a street bruiser. I ran 4.56s in a 370ci smb in a full bodied 73 Swinger with a 2800 PTC 11" & it was a monster, the cam was the XE284H, it had stock J heads with 10.3 compression, Just for kicks i installed some 3.55s & it killed it literally.

That cam being on a 112 will tune out pretty easy on a 408, it should actually be on the milder side, I ran my timing at 18* int. & 36* total all in at 2300, The XE284H is on a 110 LSA, It pulled 10 inches vacuum at 950 rpm, your cam should pull 12 or in that area. I'd shoot for 16* int. & 36* total all in by 22-2400 rpm as a baseline.

Bottom line IMO with that cam, the gears/converter will be your weak area.