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Discussion Starter #1
Hi Guy's (everyone)

I have been meaning to write this as an article for about a year and a half. If you are into 460's and Cobra Jet heads you will love what my brother, and father have done. I will post the pics and dyno sheets as I update the article. The engine build up is done. It was ALL DONE in house, and that is based on learning what does and what does not work on a Ford with C J heads in order to go Truck pulling.

Rules we originally had to meet.
1- 475 Cubic Inch max Displacement.
2- Cast over cast w/ original heads (2 valve)
3- Solid lifter Cam
4- Single carb, all as one unit
5- Gas, No alcohol (methanol)
6- single spark plug, in original position.
7- 100% naturally aspirated.

- We started out as green in the Sport of truck pulling as anyone else. We came from racing Motocross for 20+ years and owning motorcycle dealerships and repair shops, accessories etc..

- So first shot (11 years ago)we went seriously, was to have the CJ's that were on the truck ported by a local guy (who did circle track motors) and he started by testing the head flow numbers. He then ported and shaped the intake and exhaust and re-tested the head flow numbers which were improved and flowed nicely (remember we were new to pulling here) and were EXTREMELY efficient from .230 lift to about .580 lift. -At this time we were at about 462 cubes, stock crank football rods, venolia pistons around 12:1 compression .680 in and 700 ex. 110 center line (not sure of duration) 1050 dominator brand new - race spec. 2 1/2 headers and way too long at 53" then into 4>2>1 collector. Wet sump (high flow oil pump) no vacuum except header draft (we were new). MSD 8 ignition at 36-38 BTDC. (very new) Fuel was 100 LL av gas. In the pan we had built one off by us, we installed a crank oil-scraper and windage tray. The block had oil restrictors placed in the lifter valley and screens epoxyed in.

Original Dyno results coming.
 

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Discussion Starter #2
Okay so to get to the point of what happened we made 580 measley Hp which is not what we were looking for. We made a mountain of torque at 4100 rpm which is not what were looking for. We made peak HP at like 5100 rpm, which is obviously NOT what we wanted either. Since this was our first shot at it and first time at the Dyno.... we learned a lot. Like the Dyno guy knows a lot and if you get the right one he will not pull your leg, or tell you dream numbers. He said at the time the best cast over cast he ever had at under 480 Cu in was 1.5 HP / cu in with solid lifter and our rules approx . This motor ran fine, and would have made a fun little street rod, but no where near the 8,000 rpm 700+ Hp motor we were looking for. The Heads were actually ported and flowed and FILLED IN, unbelievable. Needless to say this was the last time we had someone else do the engine work for us.(porting etc...non-machining items)
 

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The cast iron intake manifold will be much more of a restriction to high RPM horsepower than the heads; filled or not.
 

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Discussion Starter #4
Cast Iron intake

- I agree, we had the Victor Jr, Intake on. Sorry forget to get to that part....after 11 yrs you begin to take some of the parts you originally had on the motor for granted.
 

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Discussion Starter #5
On with the next part.

-The next build we did was to order a kit for this motor and fit it according to what we wanted. Had the block machined and line bored to an end result of 471 Cu in.

-Now started the era of trying to get a solid cam (solid lifters) (now with 180 on the seat, and 400 over the nose springs) with a better lift and duration to match the newly (home ported heads) Yes we took all of the filler out (of the heads) and reshaped the intake and exhaust removing as much of the 'corners' out of the runners as possible, an opening up the size some. we remained with the same header combination at 2 1/2 inch into 4 inch 4>2>1's . 1050 Dominator, New steel crank, aluminum Manley rods 6.8 " and bump pistons gave us about 13.2 to one, all this came in the kit with Gaskets and seals and bearings. about 2000.00 USD in 1998.100 thousandths off the heads, we had a the block four bolted and huge new mains home made and installed. We kept hearing from all the chevy guys how Ford's were so expensive to build, and we kept asking them when the left the 70's?

-Anyway all assembled with Deck height on the block checked and machined by a brand new block machine, just in at the local guy's shop (yes, the same guy that originally ported the heads)

-Back to the Dyno for tuning, and this years test of HP.

This combination belted out 680 Hp with the peak Hp at 6700 rpm. 32 degrees of timing about 12 pulls on the dyno for testing. We were ready to at least go see how this combination would work.

Gas 100 LL
timing 32Deg
Compression 13.2 : 1
steel crank
Bump pistons (off the shelf)
Aluminum rods
Custom cam (have to look up the specs)
4 bolt mains
studded block
home ported heads -Cobra jet
2 1/2 " headers 51 " to collector
wet sump
NO Vacuum
1050 Dominator (off the shelf, race prep)
471 Cu. Inch

Next part of the build coming.
 

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Discussion Starter #9
Finally a competition piston (no more BME kits)

BIG Brother / Little Brother

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Discussion Starter #15
7700 Peak HP.

It makes peak Horsepower at 7700 rpm and loses only loses 60 horsepower at 8700 she is a screamer.

At the Addison Vermont pull we just attended we had a great weekend and got hooked up @ 8800 for the pull off in both rounds winning both rounds by 16 feet or better. Don't have a weekend like that one often but sure is nice, once in a while.
 

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Discussion Starter #17
Cam spec's

290 @ .050'', lobe separation is 113, intake centerline set at 112, intake lobe is .535'

.979 Lift
 

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Discussion Starter #19
nO We nt shorter

Hey we went with larger bore, to let the valves breathe. 3.725 stroke.
 
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