[gtofreek]

Just finished up a 468 with iron 670 heads ported by Dave at SD Performance. Also is running a ported by SD 1967 iron Q-jet intake with a Cliff built Q-Jet. Engine is 9.5:1. Cam is a Lunati Voodoo hydraulic roller with 239°/243° @ .050" duration, ground on a 112° LSA, and just under .600" lift with Comp 1.6:1 ratio steel SB Ford Ultra rockers. Installed 5° advanced on a 107° ICL. Hylift/Johnson hydraulic roller lifters. We ran it first with 4 tube headers on it. Then we are going to install Ram Air restorations H.O. manifold with 2.5" pipe to see the difference between the two. Bore is 4.185", and stroke is 4.250". Block is an early 70's 400 block. 491488 casting, IIRC. It's a street engine, so we ran it on 91 octane pump gas. Here is an average of two pulls. 1 pull from 3500-6000 RPM, and one from 4200 RPM down to 1600 to see what kind of torque it makes down low.

RPM____Torque____H.P.
1600____426______129
1700____437______141
1800____444______152
1900____445______161
2000____456______174
2100____468______187
2200____479______201
2300____488______214
2400____496______226
2500____512______248
2600____---_______---
2700____526______269
2800____536______286
2900____542______300
3000____552______320
3100____---_______---
3200____560______337
3300____566______356
3400____568______368
3500____570______380
3600____573______393
3700____573______404
3800____575______416
3900____571______424
4000____569______434
4100____573______447
4200____567______453
4300____557______456
4400____556______466
4500____551______473
4600____547______479
4700____545______488
4800____540______494
4900____534______499
5000____530______504
5100____523______507
5200____516______511
5300____512______517
5400____508______522
5500____499______522
5600____488______520
5700____472______513
5800____466______514
5900____456______512
6000____419______470

You can see where the lifters pumped up at 6000 RPM, and floated the valves slightly. These are the slow bleed lifters, so they always seem to pump up around 5900-6000 RPM. Built in rev limiter, I suppose. Ought to move a 67 GTO pretty well. I'll post numbers when we dyno with the RA manifolds.