Dyno shop tested 318
Not sure what section I wanted to post this thread but I figured this would be a good start. I picked up this 68 Dart at the beginning of January and I was curious as to what kind of power it was putting out. I was only given a limited amount of information about the engine build but it sounded pretty mean (3" exhaust turned down before rear axle). Full disclosure: I'm not an engine builder or tuning guru, so bear with me if I don't have all the information correct. All I wanted from this trip to the dyno shop was a baseline and a little tuning.
First off, I knew I had a exhaust leak at the passenger side header but I didn't get it fixed in time for my appointment. The distributor seems to be some knock off billet brand that may have an issue. We also figured out that the oil breather on the driver side valve cover needs to be replaced with the fill cap, as the PCV valve is on the same side. It was creating a lean condition. I would also believe that the 750 Holley is a bit too much for this setup, maybe a 600 cfm might do.
Here are the specs:
- 318 w/ RPM Performer manifold, Holley 750 double pumper
- Lunati cam & lifters (p/n 71977-16) adv. duration 290/290 @.050 240/240 lift
- Gross valve lift .520/.520 LSA/ICL 106/102
- Forged Pistons (brand unknown, compression ratio unknown)
- Stock iron heads w/ minor polish (heads/manifold port matched)
- Doug’s long tube headers, 3” exhaust w/ Black Widow mufflers
- 46RH overdrive transmission 2200 stall converter
- Ford 9” 3.54 gears 31 spline axles Diamond locker rear
1st pull: 254 hp. 377 tq. @ 5000 rpm
2nd pull 262 hp. 397 tq. @ 5000 rpm
3rd pull 273.3 hp. 411 tq. @ 5000 rpm
Not sure what section I wanted to post this thread but I figured this would be a good start. I picked up this 68 Dart at the beginning of January and I was curious as to what kind of power it was putting out. I was only given a limited amount of information about the engine build but it sounded pretty mean (3" exhaust turned down before rear axle). Full disclosure: I'm not an engine builder or tuning guru, so bear with me if I don't have all the information correct. All I wanted from this trip to the dyno shop was a baseline and a little tuning.
First off, I knew I had a exhaust leak at the passenger side header but I didn't get it fixed in time for my appointment. The distributor seems to be some knock off billet brand that may have an issue. We also figured out that the oil breather on the driver side valve cover needs to be replaced with the fill cap, as the PCV valve is on the same side. It was creating a lean condition. I would also believe that the 750 Holley is a bit too much for this setup, maybe a 600 cfm might do.
Here are the specs:
- 318 w/ RPM Performer manifold, Holley 750 double pumper
- Lunati cam & lifters (p/n 71977-16) adv. duration 290/290 @.050 240/240 lift
- Gross valve lift .520/.520 LSA/ICL 106/102
- Forged Pistons (brand unknown, compression ratio unknown)
- Stock iron heads w/ minor polish (heads/manifold port matched)
- Doug’s long tube headers, 3” exhaust w/ Black Widow mufflers
- 46RH overdrive transmission 2200 stall converter
- Ford 9” 3.54 gears 31 spline axles Diamond locker rear
1st pull: 254 hp. 377 tq. @ 5000 rpm
2nd pull 262 hp. 397 tq. @ 5000 rpm
3rd pull 273.3 hp. 411 tq. @ 5000 rpm
