302 BOSS BLOCK VS MAN O WAR
- Thread starter TOM B
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Is your block an early 69 or a late 69/70? If it has been sleeved it should be the 69 motor. They warrentied so many of them Ford finally started using th real T/A blocks.....then they broke pistons.
I DONT UNDERSTAND YOUR COMMENT. If my block was sleeved its a 69 block?
What does having the block sleeved have to do with the year.
No my original block has no sleeves put in.
If Ford is building there 347 Hi horse power crate engine with there new Boss 302 block then I must say that the sleeves are NOT to short and that 1 thick headed machine shop owner is not Judge and Jury.
wicked93gs
15 Year Member
well, he did say the skirts were visibly thinner...so its not solely the machine shop owner's opinion here, but I would google it to research it further if I were you
Dark Knight
Founding Member
One thing that bothers me with the world and dart blocks is the lack of screw in freeze plugs. For that much $$$ you would think they would do it. Thats one good thing about the new boss block, the freeze plugs are screw in as well as the oil galley plugs. O-ringed too.
Why would you add N20 and a blower instead of upping the boost. Yes, a vac. pump will help alot. And I sure hope you're running a forged crank and some really god pistons.
Why would you add N20 and a blower instead of upping the boost. Yes, a vac. pump will help alot. And I sure hope you're running a forged crank and some really god pistons.
I said that it PROBABLY was a 69 and here is why:
I owned a 1970 BOSS-302 when it was a current production car. I bought a used1969 motor to get the double-cross-drilled crank and it was sleeved in the #7 hole. Jack Roush, Jake King and Dan Perrin all said (and this was supported by a FoMoCo service rep) that the early stock motor was replaced with the Tran-Am blocks around mid-year 69 because they had replaced all but 50 or 60 under warrenty due to cracked cylinder walls. After this when you would disconnect the rev-limiter and let the engine rev to where it made the power the heads were capable of supporting you would break the piston about 1 to 1.25" up from the bottom of the tang (This point is right where the bottom of the cylinder wall aligns with the piston at BDC) on the non-thrust side.
As far as the new blocks are concerned, I wouldn't have a clue as to how good or bad they may be seeing as I have not and most likely will never own one.
And where pray tell did you get the idea some "thick headed machine shop woner" said anything?
You post here and don't believe Ford is the God of autombiledom and can do not wrong? Now that is a change of pace.
BTW...I agree 100% with you.
Found this on another forum.
And this if you can look at it. Third post down http://www.theturboforums.com/smf/index.php?topic=100489.0;topicseen
So now I've said it, and this guys said. So I don't think the machine shop is thick headed, seeing as they do it for a living, and you've only read what ford tells you. FWIW, the thick headed guy has owned and worked on top fuel dragsters and raced head to head against the likes of Force and Pedragon.
You asked about the Boss block and got truthful answers. If you still wanna buy one be my guest.
Hack
15 Year Member
Dynacorn built a new Boss 347 and it's in their fastback show car.
There is just no way...
I get the feeling someone has an axe to grind against Ford. If anyone reading this thread is considering the Boss block, don't let these people discourage you from at least contacting Ford to be certain everything is fine.
There is just no way...
I get the feeling someone has an axe to grind against Ford. If anyone reading this thread is considering the Boss block, don't let these people discourage you from at least contacting Ford to be certain everything is fine.
blown65
Founding Member
The motor that we just are about done with is a Dart 302 4.165 bored setup. (370 cuin I think) One thing about the block, they said it was the dirties filled block they had ever got. Lots and Lots of cleaning to get it clean. I don't remember that being such an issue with my Ford R302 block.
Yeah, dynacorn didn't build the motor. And neither did the actual comapny that built the car (not dynacorn). Alot of shops don't care, just get the motor out. And reliability won't be and issue with a car that will never see more than 200 miles, ever. The last car they built finally fired,and only two years after being built. I guess because one company did it, it must be OK. At least get some facts or see the thing for yourself before saying there is just no way.
As for an axe to grind...? It's a conspiracy. I went over to the other board and asked him to post that for me so I could come back here.
( I run an aftermarket block, made by Ford, no grinding here.)Well, ok, alot of views about the boss block, Thanks to you all. I built my 347 and my skirts did NOT come out that far as said in 10 second post, There are a few different ways to make a 347 stroke, different piston pin hight, different rod lenths,,, maybe they used a setup that pulled the piston down farther. I have forged PROBE pistons.
I will call Ford on this issue and I will call again to get a different reps opinion on the skirts. Thanks again.
I will call Ford on this issue and I will call again to get a different reps opinion on the skirts. Thanks again.
http://www.theturboforums.com/smf/index.php?topic=100489.0;topicseen
Same thread, 15th post down now, different guy, same problem.
Same thread, 15th post down now, different guy, same problem.
Pease show some pics. I'm just curious how yours is so different than everyone else's block. Pin hieght and all that other junk doesn't matter. The stroke remains the same. Which is 3.4, and will still cause the piston to come down the far, reguardless of the rod length. Even if, you can't make up that kinda difference.
67topless
Member
Just to make sure I understand
I've read the entire thread and just want to make sure I understand: Most are saying the 302 Boss Crate engine is a bad design (stroked to a 347)? It's out of my budget, but I have been looking at it the last couple of days as I am in the market for a crate engine my self. Not trying to stoke the fire any more than it appears to be all ready. Just wanted to make sure I am reading correctly.
Thanks,
Scott
I've read the entire thread and just want to make sure I understand: Most are saying the 302 Boss Crate engine is a bad design (stroked to a 347)? It's out of my budget, but I have been looking at it the last couple of days as I am in the market for a crate engine my self. Not trying to stoke the fire any more than it appears to be all ready. Just wanted to make sure I am reading correctly.
Thanks,
Scott
Hack
15 Year Member
The Boss 302 block is designed specifically to be stroked to 347. You can also bore to 4.125 to unshroud the valves and get more than 347 cubes if you want.
Yes the bores are shorter than regular 302 blocks. The reason the bores are shorter is so that you can build a 347 stroker without having to notch the bottom of the bores for clearance for the rotating assembly. That is why I stated above that the block is designed specifically for the 347 stroker. Ford shortened the bores on purpose to make the 347 stroker rotating assembly drop right in without any modifications to the block.
ford mite be building a "big bore stroker" and not using a longer stroke crank on their 347 stroker crate engine. I did read though that the bottom of the cylinders are shorter but I think it was for clearance for the crank but I am not sure. the skirts of the piston would hang lower I am guessing this mite cause some instability of the piston but I would assume that it wouldnt make that much of a difference but could be wrong
It looks like 10secgoal was right after all
the bores are shorter, but just because Ford disigned it that way so you dont have to notch it, I would have left the bores longer for more piston skirt support, even with a notch in the bore it would have added more support.
But, the question is still out there. I am running a paxton supercharger with around 15 psi and NOS. Ported 202 Edelbrock rpm heads Nos is set at ony 150 horse shot but can go up to 400. Victor jr intake with a holley commander 950 fuel injection, set up to flow up to 960 CFM
I have a Mexican 302 which is stronger than a regular 302 with stronger caps and it has a main stud girdle and ARP bolts through out. never had it on a dino. dont know the horse power
WILL IT HOLD UP!
the bores are shorter, but just because Ford disigned it that way so you dont have to notch it, I would have left the bores longer for more piston skirt support, even with a notch in the bore it would have added more support. But, the question is still out there. I am running a paxton supercharger with around 15 psi and NOS. Ported 202 Edelbrock rpm heads Nos is set at ony 150 horse shot but can go up to 400. Victor jr intake with a holley commander 950 fuel injection, set up to flow up to 960 CFM
I have a Mexican 302 which is stronger than a regular 302 with stronger caps and it has a main stud girdle and ARP bolts through out. never had it on a dino. dont know the horse power
WILL IT HOLD UP!
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