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Iron headed 468 on dyno today.
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.
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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