This engine started out as a Mercruiser 502 MAG. We wanted to see what we could do with a semi budget upgrade. I say semi budget because of using the stock block, heads, crank, rods, and pan. We dynoed it with the stock single throttle body top and the dual throttle body top we custom made.
The difference with the two tops was about 20 lb. ft. of torque and 18 HP.
Build was targeted for a Bravo application. Target idle was 800 and max RPM of 6000.
990 cast iron heads very mild "econo" porting
11/32 x 2.250 Manley SD intake
11/32 x 1.880 Manley SD exhaust
ARP rod bolts
Mel 10770 oil pump blueprinted
Custom Comp Cam
Note: Special Hyd roller lobes....
Comp SBC full body solid rollers
48 lb. injectors
Camshaft is a 111.0 Lobe Sep. Approx .600 lift
Sorry about being so vague about the camshaft. I have spent years working on camshaft design and this one is a home run for this application.