Well, an update on the 445, made it breathe a little deeper
The build is a 10:1 445 FE, with ported D2TE-AA truck heads flowing about 280 cfm, CJ undercut stem valves, ported RPM intake, 3310 Holley, 1 inch spacer, Hedman headers, dual 3 inch mandrel bent exhaust
Originally I put it together with stock hyd 1.73 rockers, with good shafts and end stands, and a 270H cam retarded to 110 intake centerline to let it live with the 10:1 compression. (270 adv, 224 @ .050, .519 lift, 110 LSA on 110 ICL)
It ran very strong, but I had an odd noise after a while, turned out to be a cracked lifter, something I hadn't seen happen before. Basically the cam was fine, but the lifter had a crack which was bleeding oil and making it clack and the oddest times.
So, I could have added a lifter and drove off, but I had it all apart and decided to go with more cam.
I went with a custom solid flat tappet tight lash Bullet cam, 282 adv, 236 @ .050, .580 lift, 112 LSA on a 104 centerline. The logic was to add some lift and duration, but have a very similar intake closing point as the hyd cam to manage dynamic compression, then spread the centers to keep overlap in check. At the same time I changed to Erson roller rockers, 1.76 ratio with needle bearing fulcrum
I expected some change but not much, the dyno programs said gains everywhere, but they typically are all over the place. However it worked out great
Trying to get a video, but the exhaust tone sort of drowns out my cell phone. The bottom line though is it feels like it revs looser and quicker, and despite a larger cam, it pulls harder everywhere, even in 4th at idle and will bang 6000 rpm in a heartbeat
So, success! The truck is probably a little to fast for its drum brakes and big heavy tires now
so next step is probably a set of good disks up front.
Movie to come soon