I might be able to get one... All I know is that it's a 302 (5.0L) block with 351C heads. The engine was rated at only 290hp due to insurance prices but in reality the engine was more like 350hp in stock form. The race version had two 4bbl carbs and produced 450hp. Would this engine be worth it? I'm going to take a look at it next week.
Need info about a real Boss 302 engine?
- Thread starter Boss 351
- Start date
Boss 351 said:
Boss 302 block is the best factory 302 block ever. 4 bolt main, high nickel content. Very strong. Boss 302's are not great street engines. They have soft low end torque. Needs to be rev'd like mad due to the massive intake ports and flow that the heads support.
If it's a real and complete Boss 302, it'd be worth a fair ammount of money to the Concours restoration people.
hmmm so this is tempting... 4 bolt mains! I wonder if the crank is the same size as the regular 302? The engine is 100% complete and has been sitting for a VERY long periode would just need to bore the cylinders, new pistons and rings, get cranked polished and new bearings... voila! New 302 boss hehe Would it bolt up to a T5 bellhousing?
90LX306
Founding Member
Boss 351 said:
Pretty sure they got a steel crank and also pretty sure they got special Boss 302 specs heads (ie..smaller valves than a Boss 351/4V 351C). I do know for a fact that the '69 and '70 Boss 302 heads have different valve sizes.
I have abook at home with much info about these cars and their engines.
Go to the Classics forum someone their will know everything you want to know.
Shakerhood
20+ Year Stangneter 
Sorry to go off topic a little, but does everyone know there was such thing as a BOSS 302 Cougar? I seen 1 before on a TV show and it was an awesome car.
This site is dedicated to the Boss 302 Mustangs.
http://www.boss302.com/menu.htm
Be sure to check out the message board there as well.
http://www.boss302.com/menu.htm
Be sure to check out the message board there as well.
Shakerhood said:
Yes and no. Mercury's hot Cougar was called the Eliminator in '69 & '70 and it was available with the Boss 302 engine. But it wasn't a special "Boss 302 Cougar" per say. They made very few of them.
Here's a 1969 & a 1970 Eliminator. The fast way to distriguish them is the stripe on the side or the grill.
1969 -
1970 -
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Modular2v said:
No they are not just Cleveland heads. They are specific to the Boss 302.
http://www.boss302.com/heads.htm
http://www.boss351registry.com/BOSS351_part_no.htm
Boss 302 Heads were C9ZE-6090-A or C in '69 or D0ZE-6090-A or B in '70 and the 4V Cleveland heads were D1ZZ-6049-B. They are different.
Holy WOW! Those are huge valves! Here is an interesting article: http://www.mustangandfords.com/techarticles/30220/
Shakerhood
20+ Year Stangneter
tjm73 said:Yes and no. Mercury's hot Cougar was called the Eliminator in '69 & '70 and it was available with the Boss 302 engine. But it wasn't a special "Boss 302 Cougar" per say. They made very few of them.
Here's a 1969 & a 1970 Eliminator. The fast way to distriguish them is the stripe on the side or the grill.
1969 -
1970 -
Yeah if I remember right, I read on the Boss 302 Cougar website that they only made 169 cars.
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