| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
08-10-2017, 02:41 AM
|
||||
|
||||
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.
__________________
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 |
|
#2
08-10-2017, 03:22 AM
|
||||
|
||||
|
I'll be very interested to see the difference between the headers and RA manifolds.
__________________
Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. Last edited by lust4speed; 08-10-2017 at 04:13 AM. |
|
#3
08-10-2017, 05:18 AM
|
||||
|
||||
|
Wow! Over 500ft lbs torque from 2500 to 5500rpm's, that's getting it done for sure......Cliff
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
|
#4
08-10-2017, 05:55 AM
|
||||
|
||||
|
Sweet motor Paul and nice work as always!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
|
#5
08-10-2017, 07:49 AM
|
||||
|
||||
|
Nice!
|
|
#6
08-10-2017, 08:01 AM
|
||||
|
||||
|
Nice engine do you mind sharing your valve spring pressures on the seat and open?
|
|
#7
08-10-2017, 08:14 AM
|
||||
|
||||
|
Flow #'s of heads?
|
|
#8
08-10-2017, 08:28 AM
|
||||
|
||||
|
Very nice combo. Run forever.
|
|
#9
08-10-2017, 08:29 AM
|
||||
|
||||
|
Nice Job Paul!
I've had good results with the Voo Doo series myself. Yes I'd like to see the flow # on the heads as well Jeff
__________________
Carburetor building & modification services Servicing the Pontiac community over 20 years |
|
#10
08-10-2017, 08:37 AM
|
||||
|
||||
|
Excellent build and information Paul, looks like you nailed that one.
__________________
The More People I Meet, The More I Love My Dogs! |
|
#11
08-10-2017, 08:40 AM
|
|||
|
|||
|
Please excuse my very minimal knowledge but what was done to get it to 9.5 cr with 670 heads. Opening up the chambers?
Thanks in advance |
|
#12
08-10-2017, 08:46 AM
|
|||
|
|||
|
Lunati cams are excellent. Butler runs this slightly bigger Voodoo cam in their 600 hp motors. But you made a good choice.
Retro-Fit Hydraulic Roller. Serious street/race cam. Needs 10.5:1 compression and 3200 RPM stall converter. Works with moderate nitrous and small superchargers. Very healthy idle quality. Advertised Duration (Int/Exh): 294/302 Duration @ .050 (Int/Exh): 243/251 Gross Valve Lift (Int/Exh): .560/.565 LSA/ICL: 110/106 Valve Lash (Int/Exh): Hyd/Hyd RPM Range: 2600-6600 Includes: Cams Only Last edited by 71 T/A; 08-10-2017 at 08:53 AM. |
|
#13
08-10-2017, 10:15 AM
|
||||
|
||||
|
Quote:
__________________
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 |
|
#14
08-10-2017, 10:16 AM
|
||||
|
||||
|
Quote:
__________________
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 |
|
#15
08-10-2017, 10:17 AM
|
||||
|
||||
|
Quote:
__________________
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 |
|
#16
08-10-2017, 10:47 AM
|
||||
|
||||
|
If I may take a stab at the flow numbers and since Paul has said the Cam was just under .600" lift, I will say 265 Intake cfm@28".
The motor accually only used 253 cfm per cylinder to make that 522 hp.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
|
#17
08-10-2017, 11:12 AM
|
||||
|
||||
|
Pretty damn close Steve! I know it's in the 260's at .600".
__________________
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 |
|
#18
08-10-2017, 12:15 PM
|
|||
|
|||
|
Great job, Paul!! I hope the owner has a large budget for rear tires...nice, flat torque curve from 3,000-5,000 with torque output of 540 ft/lbs or higher.
__________________
“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
|
#19
08-10-2017, 12:44 PM
|
||||
|
||||
|
How is idle quality?
|
|
#20
08-10-2017, 01:42 PM
|
||||
|
||||
|
The Exh Manifold test will be very interesting as that 4.210" stroke and it's resultant fast pick up of piston speed from BDC wants to pump out a lot of spent gases very early on that Exh stroke!
The 670 castings do not have much Exh port floor which may make them more sensitive to Exh back pressure then other factory castings.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
