flowed my magnum heads for my 360 build.

moturbopar said

These heads are going on my .030 360, compression will be 9 to 1cam is xe262, will be using 1.6 ratio rockers so lift will be lift will be .493 .501. air-gap intake, the heads above, 650 holley, long tube 1 5/8 headers.I think it will make close to 350 hp 400 ftlb, what do you guys think?

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Im running almost the exact same engine. Except I have a XE268 cam and at the time a 600 eddy. At the dyno I was at 262 RWHP and 308 torque. Figure you loose about 25% thru the drivetrain. So about 328HP at the engine.

I also did not have my heads ported out at all. So you very well could hit your number IMO.

Curious what plugs are you going to run?