boss 429 vs 428 cj?

66blue mustang · Jan 19, 2008

it don't have anything to do with my 66. my son and i was watching the barret jackson on tv but what is more desireable? the 429 out of a boss 429 or the 428 cj out of a 69-70 mach I? also expalin why. is one a better street motor or maybe a strip motor?

RFMustangGT · Jan 19, 2008

the 429 out of a boss 429. The boss 429 had a "semi-hemi" cylinder head. The motor was more or less a NASCAR engine that had to be put into a production car to be ok to use in racing. There was also a lot fewer Boss 429s than the 428CJs

D.Hearne · Jan 19, 2008

Ditto--Boss 429. Far more 428CJ's were produced over the Boss 9 numbers. The 428CJ wasn't a one car only motor option.

danny clemens · Jan 20, 2008

A Boss 429 car will most often be the most expensive. I've never driven a Boss 429 but from everything I've heard about them they are not as good for the street. The 428CJ is an easy car to get along with on the street except when you go to change plugs or how often you have to stop at the gas station. Both do well at the track but I would think that the 429 would have more potential. There were big name drag racers back in the day that did ditch the Boss 429 for other engines.

Edster · Jan 20, 2008

If I was to run on the highway at speed as in a road trip, i would go Boss 429, thats what it was designed for hence the use in NASCAR. If I were to run about town w/ some highway driving I'd go w/ the 428SCJ a better all around combo. Granted we aren't factoring fuel economy into he equation otherwise I would use my 1.2L Hemi that gets 45mpg and high 12s in the quarter

Sicarius428 · Jan 21, 2008

As far as auctions go, the boss 429 is more desireable. There were far fewer of them and the very early 69 boss 429s are the ones to look for. They had more one off parts which make them very unique. All of the boss 429s were shipped to Kar Kraft as 428s and kar kraft eventually sold all the motors back to ford when they had a shortage. As far as which one is better... The 428 broke many speed and time records which I am unaware that the 429 did any. The 429 was short lived and I will admit that it has more potential than the 428, the project really never left the ground. The 428 has many more years of development and the CJ/SCJ was pretty much the final product. Nascar soon after the release of the 429 put a ci limit of 352 and that was the end of the 429.
Kevin

Hack · Jan 21, 2008

The Boss 429 is more desireable for $$ factors.

As for potential, I heard a year or two ago a Top Fuel drag race team decided to try using a Boss 429 - based engine rather than a Keith Black hemi. The Boss 429 was quickly made illegal by the sanctioning body. So.. I'd say that with a potential to compete with 10,000 + HP motors in Top Fuel the Boss 429 can be extremely powerful. However, it's another one of those Ford engines.. like the cammers where Ford built to win and the rule makers decided to prevent that from happening. So there is little to no aftermarket and parts are very hard to come by.

I've also heard the 428 is friendly and fun for the street.

mr-fixit · Jan 21, 2008

Hack said:
The Boss 429 is more desireable for $$ factors.

As for potential, I heard a year or two ago a Top Fuel drag race team decided to try using a Boss 429 - based engine rather than a Keith Black hemi. The Boss 429 was quickly made illegal by the sanctioning body.

Let's see you back that statement up with facts. I am so sick of people saying "I heard" when they don't have a clue about what they are hearing or repeating.
Reminds me of the Mustang II front end threads.

Sicarius428 · Jan 21, 2008

The 428 is a pretty streatable motor... My only complaint that it does run a bit on the hot side so sitting at long stop lights are a bit unnerving.
Kevin

Hack · Jan 22, 2008

mr-fixit said:
Let's see you back that statement up with facts. I am so sick of people saying "I heard" when they don't have a clue about what they are hearing or repeating.
Reminds me of the Mustang II front end threads.

Not this time. You do the internet search yourself if you want to find the news story. I have no idea if it's even out there any more. I did read it, though and not just on an internet forum.

jasonn · Jan 22, 2008

It IS actually true. Force tried it a few years back but NHRA would not let it in. NOW they DO actually have it. Read more here!!

http://jalopnik.com/cars/sema/sema-2007-ford-boss-500-to-burn-nitro-316917.php

or, right from ford if you still do not believe.

http://www.fordracing.com/news/detail/?article=33872

danny clemens · Jan 22, 2008

Hack said:
The Boss 429 is more desireable for $$ factors.

As for potential, I heard a year or two ago a Top Fuel drag race team decided to try using a Boss 429 - based engine rather than a Keith Black hemi. The Boss 429 was quickly made illegal by the sanctioning body. So.. I'd say that with a potential to compete with 10,000 + HP motors in Top Fuel the Boss 429 can be extremely powerful. However, it's another one of those Ford engines.. like the cammers where Ford built to win and the rule makers decided to prevent that from happening. So there is little to no aftermarket and parts are very hard to come by.

Hey, I heard that too

fastcoupe68 · Jan 22, 2008

Kenny Bernstien was trying to accomplish this way back and Ford wouldnt give him the money to continue his research.

j69302 · Jan 22, 2008

jasonn said:
It IS actually true. Force tried it a few years back but NHRA would not let it in. NOW they DO actually have it. Read more here!!

http://jalopnik.com/cars/sema/sema-2007-ford-boss-500-to-burn-nitro-316917.php

or, right from ford if you still do not believe.

http://www.fordracing.com/news/detail/?article=33872

that thing is a beauty

mikethebike · Jan 22, 2008

BOSS-429, hands down. They were called 'Shot-gun-Hemi's'. Never heard them refered to as 'semi-hemi's'. The BB Chevy engine of 1964 was called a 'semi-hemi' due to the canted valve design. A TRUE hemi would have a 90 degree included valve angle like my 1977 H-D XLCH Sportster. Most engines that are refered to as hemi's really aren't.

mikethebike · Jan 22, 2008

danny clemens said:
A Boss 429 car will most often be the most expensive. I've never driven a Boss 429 but from everything I've heard about them they are not as good for the street. The 428CJ is an easy car to get along with on the street except when you go to change plugs or how often you have to stop at the gas station. Both do well at the track but I would think that the 429 would have more potential. There were big name drag racers back in the day that did ditch the Boss 429 for other engines.

The 429 had a smaller carb (735 vs 780) than the BOSDS-302! When I was on USS Orion in Norfolk in 1970 a guy had a '29 with all the special Ford NASCAR stuff
....8500 rpm, 1/2" rod bolt rotating assembly, sodium filled exhaust valves, big cam, Dominator, manifold...the whole 9 yards. The car was a very good hi-performance car.....but in the 1/4 mile.....it couldn't cut it. He had it for sale for about 25 cents on the dollar of what he had in it.

The 427 SS Chevelle ran almost .7 better in the 1/4 (11.8 vs 12.5). And if you research the TASCA Ford 'Beat-the-Boss' it only ran 11.1 or so on 'street' tires (Mohawk, I believe), through the mufflers. But it was a full-on 490+ cid Holeman-Moody engine with a full race prep automatic and every weight cutting trick in the book. I seem to remember total weight of 3300 or so. The SS was a true all iron427, M-22, 4.30 axle, weighed right at 4000lbs.

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