Ok so here's the deal,
I have a newly built 496 stroker. Has aluminium head, hydraulic roller, mp performance ignition, 11.5:1, Holley blue pump set to 6.5psi, holley 750 mechanical. The car is a 4 speed. Timing set to about 13°, about 8 HG vac, floats adjusted, acc pump adjusted, 6.5 PV (have smaller coming).
The car goes like hell 1,2,3 shift right up to 5,500. Once I hit 4 it starts to bog/ cut out like it's running out of fuel. If I cruise up to 4th on highway, as soon as I get over 3,000 rpm it does it again. When it happens I have to put the clutch in and feather it to get it back to normal, it takes a few seconds and backfires through exhaust a little bit, sometimes it stalls.
I had the car running decent and this issue was not present, but I noticed the throttle cable wasn't opening fully so I adjusted it and got a lot more power but now have this issue! I'm not sure if it's timing related, maybe need to adjust vac advance or spring in distributor? It's strange that it's only in 4th over 3k. Thanks for the help!
