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nissan lover
07-04-2006, 11:15 AM
what is involved with putting a old boss 302 into my 94. will it bolt to the m5r2? do i need thunderbird oil pan, mounts and accesery brackets?

trife86
07-04-2006, 01:16 PM
No you wouldnt want that tranny with a v8, go with a t-5. t-5's in birds has been done

fast Ed
07-04-2006, 01:33 PM
If you actually have a Boss 302 (which is a pretty rare and valuable engine, especially to restorers), and not a 302 that somebody is telling you is a Boss engine, then headers will be a bit of an issue as well. Boss 302 engines had 351 Cleveland style cylinder heads, which are quite different than regular 302 heads. Do the valve covers have 6 or 8 holddown bolts? If they have 6, it's a regular 302, if they have 8, they are Boss 302 or Cleveland heads.

A few people have done a V8 swap with the SC M5R2 trans. It can be made to work. Main issues are starter, for which you can use a 92 - 96 F-150 5.0L manual trans unit I believe, and then the matching flywheel, so that the balancing is correct for a 302 engine made from 1981 to 2001. If you do have a Boss 302, that will have the 28.0 oz. balancing, so you would have to use an F-150 351W flywheel, or in either case you could have the SC flywheel rebalanced.

91 - 93 Thunderbird 5.0L external parts should work for you, the pan, brackets, mounts, etc. that you asked about.


cheers
Ed N.

mn12sc35th
07-04-2006, 05:11 PM
Most people prefer the way a T-5 shifts, but most T-5s can't take the torque an M5R2 would handle. If you've got a good M5R2 I would go for it.

The acessory brackets may be a problem, since the heads are different, you'd have to see if the 5.0 T-Bird brackets can even bolt to them (I want to say the heads are a decent size bigger....).

All in all, you could build a 5.0 to out do a Boss 302 (there are aftermarket heads that flow better than those cleveland heads), so unless this is something you just have laying around, you might be better off that route.

ThunderDave
07-04-2006, 05:41 PM
Ford had the stock Boss 302 rated at 290 hp. That was believed to be very conservative and actual numbers might have been closer to 400 hp. I think a Boss in an SC would be very cool if it is possible.

XR7 Dave
07-04-2006, 06:11 PM
Ford had the stock Boss 302 rated at 290 hp. That was believed to be very conservative and actual numbers might have been closer to 400 hp. I think a Boss in an SC would be very cool if it is possible.

Uh, no. Best I ever read of a stock(ish) Boss 302 was a 13 something 1/4. Not even close to 400hp. Although they do make 500hp when properly prepared ($$$).

A Boss 302 in a T-Bird would be a slow pig. No torque in a car that weighs 4000lbs? Ugh. :D Installation wouldn't be difficult though. It would pretty much bolt right in. Just need the parts Ed listed and a fox body oil pan.

ThunderDave
07-04-2006, 06:28 PM
http://home.pon.net/hunnicutt/history_racing.htm

Um, maybe. They were under rated and did have more than 290 hp. ;)

ThunderDave
07-11-2006, 12:56 PM
Even Chevy under rated it's 302 Z28 Camaro.


http://auto.howstuffworks.com/30002-1969-chevy-camaro-z28.htm

nissan lover, did you decide to put the boss motor in?

fast Ed
07-11-2006, 03:16 PM
FWIW, about 15 years ago when my brother was working at an engine shop in the Toronto area that did a lot of Ford stuff, they did a stock rebuild on a Boss 302 engine. All original replacement pieces, other than the pistons, which were known for cracking the skirts. On the engine dyno, it showed up at 346 hp, if memory serves correctly.


cheers
Ed N.

nissan lover
07-11-2006, 09:18 PM
when i went to look at the engine it turned out to be a regular 302 that came out of a boss clone.

fast Ed
07-12-2006, 08:58 AM
Don't feel bad, that's usually the case. Lots of people think that they have Boss 302 engines, just because it's an old 302 with a 4-barrel carb. ;)

With only a few thousand of them ever produced originally, finding a good one for a reasonable price can be pretty tough these days.


cheers
Ed N.