Fastest 71-73 mustang belonging to forum member

[basstrix]

Was this while towing a boat?

My bass boat went 100mph a couple of times......but it was on a trailer behind a duramax

 

[Spike Morelli]

Pretty soon some of the guys posting are going to be droppin' trou and comparing their swing.........you've got to love the enthusiasm!

 

[Tyson Blair]

View attachment 96544
That would probably be Ed Voss (Worldrecholder), current C/C production land speed record holder at 221.871 MPH at Bonneville.

https://7173mustangs.com/threads/land-speed-71-73.40868/

Wow ! That is certainly built for speed! I have to find a video of that thing on its run!
Thanks for the reply!

 

[tpj71mach]

When I was about 17, I took my 73 Mach 1 out on a long stretch of deserted highway to see what it could do. I had recently built my motor and trans and wanted to see what all that money and effort got me. I always told people it topped out at 140, but honestly all I knew for sure was the speedo needle hit the trip odometer reset rod, which I estimated to be about 140mph. This was before I added the ram air set up, so it still had the block offs in the vents, and I remember feeling like it was really light in the front end. I had 245/60s on all four corners, but I knew I definitely did not want to make any steering adjustments at that speed. This was before I upgraded the rear differential, so it still had the highway gear in it. I am sure I would not have been able to reach that speed after I upgraded to the posi with the 3.89 gear ratio.

My current car, although I know everything is new and slightly beefed-up in the suspension, will never see any attempt at speeds like that. First, because I am a little smarter than that now, not much but a little. Mostly, because this engine is much tamer than that engine was, and this car came with a 3.00 gear, and plan to upgrade to a 3.25 or maybe 3.50 over the winter. I have had the car up to 100 and it felt pretty good though.

 

[cjstaci]

In 1978 I was driving my Boss 429 to Ft Lewis at around 4am. As I came around a curve in the freeway into a straightaway, I pushed the gas pedal down and the tach went up a little over 7000 and the speedometer was pointing straight down. The engine was singing, sounded sweet. I used a gear ratio/rpm calculator to figure the speed at a little over 140 mph. The car felt solid. The engine was built by Holman and Moody using mostly Ford nascar parts. The suspension was stock and still had the original F60x15 Polyglas tires and factory 3.91 gear ratio. I am still pissed at myself for selling that car.

 

[bkdunha]

In 1978 I was driving my Boss 429 to Ft Lewis at around 4am. As I came around a curve in the freeway into a straightaway, I pushed the gas pedal down and the tach went up a little over 7000 and the speedometer was pointing straight down. The engine was singing, sounded sweet. I used a gear ratio/rpm calculator to figure the speed at a little over 140 mph. The car felt solid. The engine was built by Holman and Moody using mostly Ford nascar parts. The suspension was stock and still had the original F60x15 Polyglas tires and factory 3.91 gear ratio. I am still pissed at myself for selling that car.

3.91 gears would be singing at that speed.

 

[tpj71mach]

In 1978 I was driving my Boss 429 to Ft Lewis at around 4am. As I came around a curve in the freeway into a straightaway, I pushed the gas pedal down and the tach went up a little over 7000 and the speedometer was pointing straight down. The engine was singing, sounded sweet. I used a gear ratio/rpm calculator to figure the speed at a little over 140 mph. The car felt solid. The engine was built by Holman and Moody using mostly Ford nascar parts. The suspension was stock and still had the original F60x15 Polyglas tires and factory 3.91 gear ratio. I am still pissed at myself for selling that car.

I can only imagine, I am stilled pissed at myself for selling my 73 from H.S / college days and it was just a H-code 73, great car in its own right, but certainly no Boss 429.

 

[Tyson Blair]

In 1978 I was driving my Boss 429 to Ft Lewis at around 4am. As I came around a curve in the freeway into a straightaway, I pushed the gas pedal down and the tach went up a little over 7000 and the speedometer was pointing straight down. The engine was singing, sounded sweet. I used a gear ratio/rpm calculator to figure the speed at a little over 140 mph. The car felt solid. The engine was built by Holman and Moody using mostly Ford nascar parts. The suspension was stock and still had the original F60x15 Polyglas tires and factory 3.91 gear ratio. I am still pissed at myself for selling that car.

Wow! I bet it did sound good! Never seen a boss 429. The Kassel stuff looks amazing. What did the powerband feel like? Was it Soft down low with a crazy top end?

 

[Tyson Blair]

When I was about 17, I took my 73 Mach 1 out on a long stretch of deserted highway to see what it could do. I had recently built my motor and trans and wanted to see what all that money and effort got me. I always told people it topped out at 140, but honestly all I knew for sure was the speedo needle hit the trip odometer reset rod, which I estimated to be about 140mph. This was before I added the ram air set up, so it still had the block offs in the vents, and I remember feeling like it was really light in the front end. I had 245/60s on all four corners, but I knew I definitely did not want to make any steering adjustments at that speed. This was before I upgraded the rear differential, so it still had the highway gear in it. I am sure I would not have been able to reach that speed after I upgraded to the posi with the 3.89 gear ratio.

My current car, although I know everything is new and slightly beefed-up in the suspension, will never see any attempt at speeds like that. First, because I am a little smarter than that now, not much but a little. Mostly, because this engine is much tamer than that engine was, and this car came with a 3.00 gear, and plan to upgrade to a 3.25 or maybe 3.50 over the winter. I have had the car up to 100 and it felt pretty good though.

 

[cjstaci]

Wow! I bet it did sound good! Never seen a boss 429. The Kassel stuff looks amazing. What did the powerband feel like? Was it Soft down low with a crazy top end?

The engine would run completely smooth at around 2800 rpm. It pulled hard from 3000 to 6000, but at 6000 it felt like a shot of nitrous and accelerated to 7000 crazy fast.
Driving around town wasn’t too good. It had 12.5 to compression, a small impeller water pump so under 30 mph it would start running hot, the cam was too radical so mostly had to stay in first gear, and it sucked high octane gas like crazy. The spark plugs would load up.
I don’t know what they were thinking when they built the engine because they gave it the power of a nascar engine but the rest of the car was factory original. The car only had 14000 miles on it when I bought it. I was 18 years old and stupid but I knew what I liked. When I heard the engine for the first time I was sold instantly! The car drove and handled pretty good with the polyglas tires, but they were no match for the power of the engine.
I was in the army at the time and got orders for Germany. When I returned and fired up the engine, it turned the oil into a milkshake. Apparently the orings that sealed the water and oil passages deteriorated. Back then the oring sets were still available from Ford for $100. They are worth thousands now. I pulled the engine and ended putting new bearings, rings, oil pump, timing gears. Also found that two exhaust valves were slightly bent, those were hard to find because they were the sodium cooled nascar valves. Also replaced the valve guides with silicon bronze guides. I also found that when tightening the cam gear the bolt wouldn’t tighten, the cam snout had a crack in it. I had to replace the cam and ended up with a crane cam 4200-7200 rom range. Back then there was no internet, and few people knew anything about these engines. When I started it up, it sounded amazing. A friend said “wow, it sounds like a pro stock engine “.
I ended up selling the car in 1986 for $20000 which was good money for the car at that time. It had 17000 miles on it when I sold it. The car was KK1713. If anyone knows it’s whereabouts I would be interested in knowing.

 

[Tyson Blair]

The engine would run completely smooth at around 2800 rpm. It pulled hard from 3000 to 6000, but at 6000 it felt like a shot of nitrous and accelerated to 7000 crazy fast.
Driving around town wasn’t too good. It had 12.5 to compression, a small impeller water pump so under 30 mph it would start running hot, the cam was too radical so mostly had to stay in first gear, and it sucked high octane gas like crazy. The spark plugs would load up.
I don’t know what they were thinking when they built the engine because they gave it the power of a nascar engine but the rest of the car was factory original. The car only had 14000 miles on it when I bought it. I was 18 years old and stupid but I knew what I liked. When I heard the engine for the first time I was sold instantly! The car drove and handled pretty good with the polyglas tires, but they were no match for the power of the engine.
I was in the army at the time and got orders for Germany. When I returned and fired up the engine, it turned the oil into a milkshake. Apparently the orings that sealed the water and oil passages deteriorated. Back then the oring sets were still available from Ford for $100. They are worth thousands now. I pulled the engine and ended putting new bearings, rings, oil pump, timing gears. Also found that two exhaust valves were slightly bent, those were hard to find because they were the sodium cooled nascar valves. Also replaced the valve guides with silicon bronze guides. I also found that when tightening the cam gear the bolt wouldn’t tighten, the cam snout had a crack in it. I had to replace the cam and ended up with a crane cam 4200-7200 rom range. Back then there was no internet, and few people knew anything about these engines. When I started it up, it sounded amazing. A friend said “wow, it sounds like a pro stock engine “.
I ended up selling the car in 1986 for $20000 which was good money for the car at that time. It had 17000 miles on it when I sold it. The car was KK1713. If anyone knows it’s whereabouts I would be interested in knowing.

Wow ! What a great explanation. My god that engine in a stock chassis! Yeah I can almost imagine. The only poly glass tires i ever drove were like rocks, can’t imagine the wheel spin! The revs jumping up high quickly makes me want to call Jon Kasse. Would you ever try a boss 429 on the street again? If so would you change it from the original engine in any way?

 

[cjstaci]

Wow ! What a great explanation. My god that engine in a stock chassis! Yeah I can almost imagine. The only poly glass tires i ever drove were like rocks, can’t imagine the wheel spin! The revs jumping up high quickly makes me want to call Jon Kasse. Would you ever try a boss 429 on the street again? If so would you change it from the original engine in any way?

I would love to have another Boss 429, mostly because the engine looks so cool. The Kasse heads are improved over the original heads. He designed them with thicker deck surface, revised oiling for use with standard 429 blocks and eliminated the orings for use with head gaskets. The rocker arm pedestals are integrated into the head and the aftermarket rocker arms are a better design. Also, the combustion chamber has been redesigned. These heads would be great on a street motor especially a stroker over 500 ci. There’s also several wedge heads available that are just as capable and even more so.
I am currently in the process of building a shop, should be done in a month or so. Once I get everything set up and organized I can continue the build on my 69 sportsroof. I have a CJ block with milodon 4 bolt main caps, screw in freeze plugs, forged crank, 557 ci, Kasse P51 heads, solid roller, TFS intake and a 1050 dominator. Should make 700+ hp on pump gas. I’ve thought about switching to boss heads but that would add a cost of $15,000 or more, that’s a lot of money just for looks.
As you can see, I need more room, lol. The garage 48x30 with a 20x12 connection to the existing garage. I have a 12,000lb 4 post alignment lift and have planned for a 2 post lift. The garage has full hvac, 220v for two lifts, air compressor, two welding outlets, and hvac, a ton of 120v and a ton of lighting. It will be fully insulated and sheet rocked. Also has a drive through bay.

 

[tony-muscle]

I would love to have another Boss 429, mostly because the engine looks so cool. The Kasse heads are improved over the original heads. He designed them with thicker deck surface, revised oiling for use with standard 429 blocks and eliminated the orings for use with head gaskets. The rocker arm pedestals are integrated into the head and the aftermarket rocker arms are a better design. Also, the combustion chamber has been redesigned. These heads would be great on a street motor especially a stroker over 500 ci. There’s also several wedge heads available that are just as capable and even more so.
I am currently in the process of building a shop, should be done in a month or so. Once I get everything set up and organized I can continue the build on my 69 sportsroof. I have a CJ block with milodon 4 bolt main caps, screw in freeze plugs, forged crank, 557 ci, Kasse P51 heads, solid roller, TFS intake and a 1050 dominator. Should make 700+ hp on pump gas. I’ve thought about switching to boss heads but that would add a cost of $15,000 or more, that’s a lot of money just for looks.
As you can see, I need more room, lol. The garage 48x30 with a 20x12 connection to the existing garage. I have a 12,000lb 4 post alignment lift and have planned for a 2 post lift. The garage has full hvac, 220v for two lifts, air compressor, two welding outlets, and hvac, a ton of 120v and a ton of lighting. It will be fully insulated and sheet rocked. Also has a drive through bay.

Wow. Nice!

 

[Tyson Blair]

Wow. Nice!

You are doing it right with that garage. Are you sticking with concrete slab or are you considering some of the modern
Textured coatings? Our new house the garage came with some kind of coating that is no slip and does not allow oily fluids to soak in and is real easy to clean. I have no idea what the hell it is but it is cool.
I would love to hear how your new project develops. I have considered the same type of build but I kept the power levels under 600hp because of the header situation on 71 mustangs. I hear basically there are no great options except with the exhaust hanging super low. Also I felt hemmed in with low rise intakes to work with the factory ram air. The 385 engines have such potential though I kinda feel like I missed an opportunity to really go for it on my last big block build. I hear exactly what you are saying about the boss heads. But I wonder if even with the amazing wedge heads available today, doesn’t the boss 9 have a high rpm magic beyond just its looks or is it so marginal compared the the best wedge heads that it really is just a cool factor? Was it hard to get your hands on the p51 heads?