Original Cobras with 428s what hp?

[olddog]

Many original Cobras were sold with 428 FE engines. Were these the same 428 CJ engines that Ford put in everything else or did Shelby do anything to them to bring them up closer to the 427 FE?

Everything I have read listed the 427 SO at 425 hp, but manufactures were playing with the numbers a bunch back then. So much so that around 72 or 73 the Feds (think this is correct) stepped in with the ASE NET hp standard. So for that matter by todays standards what was the 428 and the 427 engines sold by Shelby actually putting out?

[mrmustang]

335hp..........

[1985 CCX]

I have been told 335hp as well?

[rms427]

I have copies of original spec sheets from Shelby. The 427 competition car was rated at 480 HP, The 427 street engine was rated at 425 HP and and the 428 was rated at 390 HP. However various engines and rear end gears ended up in the cars depending on what was available. The specified rear end ratio on the 428's was 3.31 but my 428 car has 3.54 gears. The specified rear gears in the comp car were 3.77 and the 427 street car specified 3.54.

[rms427]

Here are copies of the Original Shelby Spec Sheets on the 427 Cobras. Unfortunately when I made these copies back in about 1970 the copy machine did not reproduce the red cobras on the 427 spec sheets (just the wheels). I had the color spec sheets at one time but can't find them. Sorry that they are hard to read but I had to reduce the sizes to be able to post them. The percentage numbers are just the amounts I reduced the files.

[rsimoes]

Originally Posted by rms427

Here are copies of the Original Shelby Spec Sheets on the 427 Cobras. Unfortunately when I made these copies back in about 1970 the copy machine did not reproduce the red cobras on the 427 spec sheets (just the wheels). I had the color spec sheets at one time but can't find them. Sorry that they are hard to read but I had to reduce the sizes to be able to post them. The percentage numbers are just the amounts I reduced the files.

Can you email me the original copies (larger)? Thanks!

[olddog]

Originally Posted by rms427

Here are copies of the Original Shelby Spec Sheets on the 427 Cobras. Unfortunately when I made these copies back in about 1970 the copy machine did not reproduce the red cobras on the 427 spec sheets (just the wheels). I had the color spec sheets at one time but can't find them. Sorry that they are hard to read but I had to reduce the sizes to be able to post them. The percentage numbers are just the amounts I reduced the files.

I'm impressed with the original literature and the car. Thanks

[Anthony]

Originally Posted by olddog

Original Cobras with 428s what hp?

not enough.

[Badsnake427]

Does anyone know how many of the originals came with the 428?

[Ron61]

If you have the 1997 registry you can look it up. If not, then take the easy way and wait until Ron(CW) sees this and he can answer it without having to look through the registry. I am pretty sure the n\first 60 CSX3XXX cars were 427 comp cars with single 4 barrels and then he went into the 428s and finished the 3000 series with 427s with dual 4s.

Ron

[Badsnake427]

Thanks Ron, much appreciated.

[Bobcat]

The 427 was available in two stages ... Q code and R code . The Q code was a single 4 bbl version and was factory rated at 410 hp @5600 rpm and 476 ft lbs of torque @ 3400 rpm . The R code was a dual quad version rated at 425 hp @ 6000 rpm and 480 ft lbs of torque @3700 rpm .
This is one of my toys ... a 63 1/2 Galaxie 427 Q/R code depending on my mood .
According to my Ford data , the 428 CJ ... single 4 bbl rated at 735 cfm , put out 335 hp @ 5200 rpm and 440 ft lbs of torque @ 3400 rpm . They were playing with the hp ratings ( advertised ) to get around the insurance surcharges etc back then . Notice that the hp is way under the torque while it is closer on the 427 . I don`t have info on a standard 428 , but believe it is about the same ratings , however , don`t know if Shelby did anything special to the 428 .
Hope this helps .

[rms427]

As far as HP my 428 turned a best of 12.4 at 112 mph back in 1970. The only changes from stock were Dunlop rain race tires, side exhaust, 3310 holley carb and dual point distributor. I used the car as my everyday car. I put around 48,000 miles on the car the first 4 years I had it. The only problems I had with the car were the front ball joints failed and it overheated until I added a second small fan. The ball joint fix was adding zirk fittings.

The SC Cobras turned around 12.20 with Goodyear road race tires so my car wasn't that far off. I also got about 15.5 mpg. I now get between 10 and 12 mpg with a medium riser 427. The only time I ran the car with the 427 I turned 12.6 at 113 mph. However it was 95 degrees and 95 % humidity so it's not a good comparison as the 12.4 was probably at around 50 degrees.

[Jim Maxwell]

Approximately 100 Cobras were produced with the 428 P.I. engine, starting with CSX 3201 and ending with CSX 3301, with a few stragglers, CSX 3305 and 3306. I count only 11 of those as having their 428 engines still in place, according to the the 1997 registry.
The two original Shelby brochures I have list the 427 as 425 hp, 480 torque and the 428 at 355 hp 420 torque. The document shown above listing 390 hp from Shelby is fascinating. I haven't seen that one before.
My 428 powered Cobra is plenty fast for me!

[Jim Maxwell]

rms427, could you e-mail me the first document you show above, please? It would be nice to have that in my records for CSX 3288. Thanks! Jim
jmaxw27408@aol.com