360 Magnum building on an existing bottom end

65TTCuda said
Do they perform well OOTB ? What kind of HP do you estimate your engine is producing ? Do you think these heads can support 500+ HP ? Did you buy them bear and build them to your cams needs or buy them all assemble ? What cam are you using? Thanks in advance for the info.

I'm still kind of a rookie when it comes to performance engines so I don't have a lot to compare them to. It's 15-16 vacuum at idle, 160ish Cranking Pressure. Runs very strong, I hope it's putting out at least 350 hp, maybe a little more? Be great if it was close to 400. Bought the heads from Mancini 3 years ago during Black Friday sale fully assembled. Sent my Magnum cam to Oregon Cam Grinding for his #1280 grind. .216/.224 @ .050 and .517 with 1.6 rockers. Doug's headers and a 9.5" PTC converter. 650 AVS Edelbrock.

First time I went that deep into an engine and transmission all by myself. Well, I did get online tech support from Roy @SGBARRACUDA (RIP) and @RustyRatRod. Probably wouldn't run so well without their help.