Rich DiBonaventura
Here are some pictures of the modifications to the BBM heads and the rocker system we used.
The rockers are stock T&D for Blue Thunder (A.T.Francis) Hi-risers. They required that we machine a .500″ thick spacer to correct the geometry for medium risers. If T&D would make this set up in a medium riser for you,
then I would suggest offering the heads tapped for them…. This system is bulletproof.
Attached are some files, The engine was built with a Genesis block that I had for a bit, I wish I didn’t already have it because I like the main saddle setup in yours much better. Anyway Danbury Competition in Danbury, CT. Supplied the reciprocating assy and performed the machine work, balancing and head modification as well as supplying many of the internals to complete the build. I sourced the cam from Lunati to my specifications and performed the final assembly here at my shop in CT. For the dyno I used Mason’s Racing Engines in North Scituate, RI he has a Super Flow 902 dyno with the revisions.
UPDATE:
We finished up on the dyno last night, Peak torque is 601.5 @ 5300, Peak horsepower is 695.5 @ 6800.
I’m very pleased with the results. Once again this was a very straight forward build, not max effort or exotic. 496 cubes 4.310 X 4.25.
12 to 1. .685″ lift mech roller W/276 & 284 degrees @ .050 int & ex. Stock 1050 Dominator on a Victor. We ran it on VP C12.
Interestingly it only wants 30 degrees timing, a testament to the chamber efficiency. Once again thanks for making a great product.
This is going in a 3650 lb car, I’ll let you know how that goes….
that’s where the real proof will be.
