[gtofreek]

I recently finished machining, and building a .065" over 400 for a 67 GTO street car. You can read about the build here.
http://forums.maxperformanceinc.com/...d.php?t=785341

OK, so we get 'er dynoed today. I was pleasantly surprised. Here is how it was dynoed.

1. Points distributor with Blue Streak points.
2. Cliff built 1967[I believe] Q-jet. 6.5 lbs. fuel pressure[was 5.7 lbs. but somehow crept up to 6.5].
3. Stock 1971 iron intake. Unported, as cast.
4. Crappy 3 tube Cyclone headers, no mufflers, w/ 6" diameter pipe slipped over collector to vent exhaust outside.
5. 91 octane pump gas.

Just to refresh, this is a 413", 10.1:1 compression, 67 GTO engine. It has CNC ported 670 heads from Dave @ SD Performance. RPM 5140 rods, and CP flat top .065" over pistons, with Steel gas nitride top ring, Napier second ring, and low tension oil ring. Stock crank, .010"/.010". The cam is a Lunati VooDoo hydraulic roller, 231°/239° @ .050". Ground on a 110" LSA. Install on a 103.25 ICL. Lifters are Hylift/Johnson.

First off, we hit the button, and it fired up within 2 seconds. Instantly idled, but just a tad low so I set it up to around 850-900 RPM. Engine had a steady 60 PSI oil pressure. Set total timing at 36° BTDC, not knowing what these heads would want after the mods Dave did to the chambers. Heard no audible detonation. Plugs looked good. I predicted about a week ago that it would make 453 HP, and 482 ft. lbs. of torque. First pull it made 447 HP, and 484 ft. lbs.! Bumped the timing up to 38°. It made 456 HP and 494 ft. lbs. Still heard no detonation, and plugs looked good, with no visual signs of detonation, and looked to be burning about right[not too rich, not too lean], so we bumped the timing up to 40°. It made 465 HP, and 503 Ft. Lbs.! Look at the torque down at 1500 RPM! 400 Ft. Lbs. @ 1500 RPM! 500 Ft. Lbs. @ 2900-3000 RPM! For a pump gas 400, this thing is a torque monster!

Here is the dyno sheets. The guy finally got new ink cartridge so now the sheets are dark enough I can scan them and still read them.





And a graph.