452ci 906 heads on pump gas

[heyoldguy]

I suppose I may become a pain, but I've just never had the opportunity to vent like this.

On March 27, 2008 we took a '71 Road Runner (can I say that on a Charger forum?) to Westech Performance Group in Mira Loma, CA for a chassis dyno test.

   400 Block
   4.380 bore size
   440 forged crank turned to 400 main, counter weights cut .125" in radius.
   Aftermarket H-beam rods
   Ross forged flat top pistons, 9.8:1 compression
   Total Seal Gapless top ring
   850cfm Mighty Demon
   Edelbrock 383 Victor
   2" HVH Super Sucker Tapered Spacer
   Racer Brown Solid Roller CR-78/80, 278/280 @ .050, .680/.680 lift @ 1.6:1
   Comp 829-16 solid roller lifters
   Harland Sharp roller rockers 1.6:1
   Smith Brothers pushrods
   Ported 906 heads 2.25/1.81, 11/32 stem, custom Manley valves. No epoxy, no welding.
      Before porting: 63cfm@.100, 137@.200, 187@.300, 216@.400, 224@.500, 232@.600
      After porting:   83cfm@.100, 158@.200, 206@.300. 250@.400, 289@.500, 326@.600, 342@.700, 346@.770
   Custom 2x2-1/8 step header 3-1/2" diameter collector.
   3-1/2" exhaust system to rear axle, H-pipe, DynoMax Bullet Mufflers
   4.89 gear ratio, Moser Spool, Moser 35 spline axles, reinforced 8-3/4 housing
   833 23-spline 4-speed
   275 60Rx15 street tire
                                                      A/F
      RPM     RWHP     RWTQ     MPH     Ratio
     3669     251.9     360.6      57.3     13.3
     3757     275.4     385.0      58.6     13.2
     3851     302.4     412.3      60.0     13.1
     3939     319.8     426.4      61.5     13.1
     4027     338.4     441.3      62.9     13.1
     4129     352.1     447.8      64.4     13.2
     4230     367.3     456.1      65.9     13.2
     4325     381.4     463.1      67.4     13.0
     4430     393.8     466.9      69.0     12.8
     4531     408.8     473.8      70.6     12.6
     4638     424.5     480.7      72.2     12.4
     4736     439.8     487.7      73.8     12.3
     4826     452.9     492.9      75.4     12.2
     4930     464.1     494.4      77.0     12.2
     5034     473.7     494.1      78.6     12.1
     5139     482.5     493.1      80.2     12.0
     5235     490.4     492.0      81.8     12.0
     5338     496.4     488.4      83.5     11.9
     5433     502.8     486.1      85.0     11.9
     5538     508.9     482.6      86.6     12.0
     5638     513.0     477.9      88.2     12.0
     5718     517.7     475.5      89.7     12.0
     5811     522.0     471.8      91.3     12.0
     5888     527.9     470.9      92.8     12.0
     5990     532.6     467.0      94.3     12.0
     6077     536.5     463.7      95.8     12.1
     6168     540.6     460.4      97.3     12.1
     6252     542.4     455.7      98.8     12.2
     6364     543.7     448.7     100.2     12.2
     6434     544.4     444.5     101.6     12.3
     6517     544.4     438.8     103.0     12.3
     6573     544.3     434.9     104.4     12.4
     6671     544.9     429.0     105.8     12.5
     6771     545.6     423.2     107.2     12.5
     6853     546.7     419.0     108.5     12.6
     6924     548.4     416.0     109.8     12.6
     6977     552.3     415.8     111.1     12.6
     7087     554.2     410.7     112.4     12.5
     7171     552.1     404.4     113.7     12.5
     7212     550.1     400.6     114.9     12.5

[jhowell34]

dang is this a street car? im jealous

[heyoldguy]

Yeah we drove it around on the street for awhile. It had a real bad tendency to set off the car alarms in parked cars as you drove down the street. It was interesting, at Hot August Nights in Reno, NV, getting in and out of the hotel parking lot.

[heyoldguy]

The engine wasn't build to be a street motor. It was built to 'qualify' as a street motor. It was for a normally aspirated, pump gas (93 octane or E85), chassis dyno challenge. It placed 6th or 7th nationally and was massacred by the top three, all Mopars. 1st 654ci Hemi 956.83 RWHP (E85), 2nd 572ci Hemi 749.69 RWHP (93 octane) and 3rd 500ci Wedge 696.48 RWHP (E85). We had some problems during qualifying and only pulled 511 RWHP or it would have qualified 4th making the final top four all Mopars. Kinda let the Mopar gang down.

[68pplcharger]

The engine wasn't build to be a street motor. It was built to 'qualify' as a street motor. It was for a normally aspirated, pump gas (93 octane or E85), chassis dyno challenge. It placed 6th or 7th nationally and was massacred by the top three, all Mopars. 1st 654ci Hemi 956.83 RWHP (E85), 2nd 572ci Hemi 749.69 RWHP (93 octane) and 3rd 500ci Wedge 696.48 RWHP (E85). We had some problems during qualifying and only pulled 511 RWHP or it would have qualified 4th making the final top four all Mopars. Kinda let the Mopar gang down.

That is nothing to be upset about!!! that is crazy horsepower for cast iron ported heads and pump gas. 

[Budnicks]

Yeah we drove it around on the street for awhile. It had a real bad tendency to set off the car alarms in parked cars as you drove down the street. It was interesting, at Hot August Nights in Reno, NV, getting in and out of the hotel parking lot.

Sounds like a great engine chassis combo the others weren't really a street combo buy any strech of the imagination...

[mauve66]

alot of RPM for a b block, i used to have a twin cam I4 that sounded good at 7800 RPM i want to hear what a big block sounds like at that RPM, anyone got a sound bite??

[heyoldguy]

www.youtube.com/watch?v=EbZ8jGq6x1c That is a 500ci wedge at 7400rpm

[Budnicks]

  "The Sweet sound of Mopar muscle" 

[mauve66]

 

[Cooter]

The engine wasn't build to be a street motor. It was built to 'qualify' as a street motor. It was for a normally aspirated, pump gas (93 octane or E85), chassis dyno challenge. It placed 6th or 7th nationally and was massacred by the top three, all Mopars. 1st 654ci Hemi 956.83 RWHP (E85), 2nd 572ci Hemi 749.69 RWHP (93 octane) and 3rd 500ci Wedge 696.48 RWHP (E85). We had some problems during qualifying and only pulled 511 RWHP or it would have qualified 4th making the final top four all Mopars. Kinda let the Mopar gang down.

Big money makes big power....I'd be proud of a Wedge that you can surely bet cost about 1/3 of what those Hemi's did and made respectable power to boot...

I'd say it was a job well done.