Bullock's Power Service - 465 inch CJ - 475 HP at 5500 RPM

[My427stang]

Performance Summary:
      Cubic Inches:  465           Dyno brand: Land and Sea Dynomite
      Power Adder:                    Where dynoed:  Willard Auto Machine, Omaha, NE
      Peak Horsepower:  477 @ 5500 (471  @ 5950)
      Peak Torque:  524 @ 4000


Engine Specifications:
   Block brand, material, finished bore size, other notes:  Factory 428 C scratch  4.175
     
   Crankshaft brand, cast or forged, stroke, journal size: Cast SCAT 4.25
     
   Connecting Rods brand, material, center to center distance, end sizes, bolts:  SCAT I-beam 6.70

   Piston brand, material (caster, hypereutectic or forged), dish/dome volume, static CR: Racetec, 4032 Forged, -22 cc, 10:2

   Main Bearings, Rod Bearings, Cam Bearings brand and size:  Clevite rod and main bearings, Durabond cam bearings

   Piston rings brand, size, other notes:  Mahle 1mm / 2mm standard tension

   Oil Pump, pickup, and drive:  Melling M57HV, Milodon pickup, Melling HP drive

   Oil pan, windage tray, oil filter adapter:  Milodon 31130, factory oil filter adapter

   Camshaft brand, type (hyd/solid, flat tappet or roller), lift and duration (adv and @.050"):  Custom Bullocks hyd roller, 235 intake duration / 242 exhaust duration, 114 LSA on 107

   Lifters brand, type:  Morel standard travel

   Timing chain and timing cover: Cloyes 9 position, factory timing cover

   Cylinder heads brand, material, port and chamber information:  Factory CJ C8OE-N, unported
 
   Valve springs brand, part number, specs:  977-16 Comp 155 closed, 405 open
 
   Rocker arm brand, type (adjustable or non-adj), material, ratio:  Harland Sharp Adjustable

   Rocker shafts and stands, brand, material:  Harland Sharp shafts, Precision Oil Pump stands

   Pushrods brand, type, length:  Smith Brothers, 3/8 cup, 5/16 ball, non oiling  .080 wall , length, 8.400

   Valve covers, brand, type:   1970 CJ - baffles removed by owner

   Distributor brand, advance curve information:  Pertronix 2 billet

   Harmonic balancer brand:  Factory CJ rebuild

   Water pump brand, type (mechanical or electric):   Tuff Stuff iron  - electric powered on dyno

   Intake manifold brand, material, porting information:  Blue Thunder CJ - unported

   Carburetor(s) brand, type:  DOZF-AB CJ Automatic, stock jetting, no spacer,  gasket only

   Exhaust manifolds or headers brand, type:  Dyno headers, 1 7/8 truck, 3 inch collector

[My427stang]

This was an interesting one, lots of variables changed from my normal routine, some not changed

Most important was the new dyno, I did this one locally because we had to deliver quickly.  It's very hard to compare one dyno to another, but it came up with a realistic number, although I think a little stingy, need to do another on it to see how to compare.  What I was not fond of was the correction factor, no excuses, but we went from a sunny day to snow squalls and dropping atmospheric pressure but the dyno didn't change it's correction.  Regardless, the numbers are what the machine told us, and with approx a 250 cfm head, it's using it all

This one was a set of iron heads with 11/32 valves, no porting, early BT CJ intake, also no porting, no spacers because of it being a shaker car, and a bone stock 70 CJ carb, even jetting was stock although I am running a 7.5 PV.  Turned out pretty nice, a/f was rock solid at 12.5/12.7 through the pull, although we did use all of that carb, it made lots of idle vacuum with 114 LSA and carried the HP within 4 hp from 5500 peak to 6000, torque was above 500 ft lbs from 3300-4500

This is going in a A/C C-6 PB street Mach, so it will be a monster compared to it's broken 428.  However, like the old "stone soup story"...some head, more overlap, some spacer, modern carb, etc

Regardless, neat to see that a set of unported heads and intake with a 735 and a mild mannered vacuum and idle requirement can make 100+ HP over a decent running CJ

[410bruce]

That's a nice engine, Ross. Excellent street engine as it makes all its power by 5500. That Mustang's gonna rip. 

[Sand hauler]

Very nice job Ross, by the way where did you find a set of 1 7/8 truck headers? Been looking for some for mine

[My427stang]

Wish I knew what they were, swap meet specials

[WerbyFord]

Any dimensions on the header lengths?
Or cam lift?

Good to see the old heads get the job done, then again all those SuperStock wins came from somewhere.

[My427stang]

I haven't been up there in a while, but they were Ford truck headers, not sure on length.  Long tube, nothing fancy

Cam lift was .588