Questions from the young guy

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bidibronco

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Okay, I'm looking at getting a fully balanced rotating assy. from a local fella for my 351. It's a stock stroke but it is .30 over pistons and the jernals are .010 diff. and the dish is .110. Can anyone tell me if a .5015 lift will clear the dish and with a .30 over bore will the computer run it? I know with a different stroke I think you have to ditch the computer or get a custome one. I do plan on getting a custom computer but I'm a bit short on the funds at the moment. Also, a completely balanced assy., will I need to get a different harmonic balancer and/or flexplate/torque converter? I know that on a carb motor we did a .30 bore and had to do no adjustments to the carb for more or less fuel but I'm not sure if speed density would have a problem with this or not? I don't want to go to carb because I like my easy cold startup and such. Any information on this would be outstanding!

 

Broncobill78

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Okay, I'm looking at getting a fully balanced rotating assy. from a local fella for my 351. It's a stock stroke but it is .30 over pistons and the jernals are .010 diff. and the dish is .110. Can anyone tell me if a .5015 lift will clear the dish and with a .30 over bore will the computer run it? I know with a different stroke I think you have to ditch the computer or get a custome one. I do plan on getting a custom computer but I'm a bit short on the funds at the moment. Also, a completely balanced assy., will I need to get a different harmonic balancer and/or flexplate/torque converter? I know that on a carb motor we did a .30 bore and had to do no adjustments to the carb for more or less fuel but I'm not sure if speed density would have a problem with this or not? I don't want to go to carb because I like my easy cold startup and such. Any information on this would be outstanding!
Man, you DO come up with some interesting questions don't you ? Do you research these things or are you just pulling this stuff off the top of your head ?

The .030 over shouldn't mean jack to the computer. All it really cares about is sniffing the exhaust & maintaining the air/fuel ratio it was programed to, it'll just squirt in a bit more fuel and should be happy as can be. Someone else can tell me if I'm wrong but I don't think you'll need to change the flexplate or harmonic balancer for anything exotic. The fact that it's a "fully balanced" rotating assembly just means it won't shake itself apart. To be painfully honest with ya the balance job doesn't mean a whole lot at *our* level of performance. The factory makes sure that all of the parts weigh within a couple grams of each other & calls that good enough & since we've all seen well-cared for stock small blocks go for close to or more than 200K I have to think they're onto something. Performance rebuilders & guys in the Go-Fast crowd like to make sure that every piston weighs *exactly* as much as every other piston and that the whole thing rotates as perfectly as they can get it to. While this certainly doesn't cost you any power, the benefits of it are a lot less important at the street revs we run at. Once you start spinning that much metal at 8000 then sure, balance becomes a lot more important to how long your engine lives and that's the real benefit of balancing it, engine longevity. Anyways, not to drag on for too long but no the parts you have now should work fine with the parts you're looking at.

If you want to know if that will clear the lift with the cam you have (really man I swear you must study up to ask the most obscure questions) then you should pick up the phone & call Erson, or Isky or whoever the **** you bought the cam from. If *those* guys are tired of your questions then put the parts together, grab yourself a piece of clay and go find out :) /emoticons/[email protected] 2x" width="20" height="20" /> I'll be absolutely freaking *amazed* if someone here knows the answer to THAT one off the top of their heads <grin>

 
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bidibronco

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Man, you sure know how to make "well, me" feel like an ass. I've always wanted to build a **** of a performance motor and people think I'm crazy for wanting to stuff it in a Bronco but the fact of the matter is, my Bronco doesn't see off road or street races or anything in between. It just sees a hefty righ foot all the time. Yeah, I could go get a stang and make it run 12's or 10's but the're everywhere. I want something I MYSELF enjoy and have it for whatever I want it for. I hope I'm not souding like a **** or anything because I'm not trying to. I just want a decent HP motor that's fuel injected in my Bronco. Not to mention I want to replace my crank due to my oil problem and a new crank is something like $200 (this isn't a part I'm willing to get from a junk yard) and I can get the assy. for around the same. On another note, anyone have the cumbustion size on stock 91 351w police interceptor heads are? Know where I can get it? Thanks! Sorry for the outrageus Q's too...

 

Broncobill78

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Man, you sure know how to make "well, me" feel like an ass. I've always wanted to build a **** of a performance motor and people think I'm crazy for wanting to stuff it in a Bronco but the fact of the matter is, my Bronco doesn't see off road or street races or anything in between. It just sees a hefty righ foot all the time. Yeah, I could go get a stang and make it run 12's or 10's but the're everywhere. I want something I MYSELF enjoy and have it for whatever I want it for. I hope I'm not souding like a **** or anything because I'm not trying to. I just want a decent HP motor that's fuel injected in my Bronco. Not to mention I want to replace my crank due to my oil problem and a new crank is something like $200 (this isn't a part I'm willing to get from a junk yard) and I can get the assy. for around the same. On another note, anyone have the cumbustion size on stock 91 351w police interceptor heads are? Know where I can get it? Thanks! Sorry for the outrageus Q's too...
Aw c'mon, I'm just funning with ya.

Trust me, I've been down that road. You can do all sorts of $hit to a car & all you'll ever do is make it go faster and that *always* ends with a court date & you walking for some State-determined period of time. Put the same time & effort into a truck and you've increase the places it can go and the range of things it can do. World of difference.

Sure, with the probs you've had swapping out the rotating assembly isn't a bad idea, just don't let the seller 'jack you for extra $$$ over the balanced aspect of the parts. Unless you plan to spin upwards of 7K I wouldn't worry *too* much about that but if you can get a good price on the parts than run with but use the info to dicker him down. Ask him *why* the balance job is something you should pay extra for in a street truck, if it's REALLY that much added value then he should be happy to hang onto it until a dedicated racer comes along willing to pay a premium for something he finds usefull. That's all, sorry if it didn't come out that way. I answered it right after coming home with my junkyard jewel and popped open a couple cold ones a few hours earlier than I usually do. My bad.

I'll look around but I don't think the Interceptor heads were any different the the other million or so they installed that year. I was a Mass. Officer in 91' and we picked up several new cruisers that year. As a rule the Police Package was HD suspension, radiator, alt, belts & hoses, oil & tranny coolers and those stoopid little hubcaps. There are other options like the "dark car", ignition cut-off, 140mph certified calibration speedo, etc but as far as engine mods went I believe the heads were just stock production heads. I spent some time talking to a dealer salesman about it when we had to bring back a 3 DAY old cruiser that some pinhead had slammed. The Chief told us to wait until Monday but the Lt didn't want to wait & grabbed it Fri after the Chief went home. Sunday night a guy one of the Sgt's was following didn't see anyone behing him & threw his truck into reverse & lit up the tires. Right into the nose of our brand new unmarked. NOT the thing for him to have done. At any rate, the engines are largely stock because the HiPo versions tend to burn out after 5 or 6 yrs of 24/7 operation. The Mustangs were an exception but we never had any of those, cheap-a$$ Chief.

Aw ****, the questions are challenging <grin>

 
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madmax

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broncobill is dead right about the comp just sniffing the exaust and then attempting to keep the mix right by that, atleast with the non mass air trucks (ive not messed with the mass air ones so i dont know)

 

bluefordcat

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Definantly you ask the questions! LOL but so do I Hey you dont know unless you ask right?! check this link these are 5.8 block based engings if you want ponies http://www.roushperformance.com/engines/engines.shtml

Good luck I too would love to have my bronc run like it's ass was scalded. knew a guy who put a LT1 in a toyota land crusier jeep. would a stang or vet touch it nope. one bad ass 4x4 . that is what I would like to see from my bronco I'm not a mud runner nor rocking climbing fool (sorry) basically street & mild off roading with a heavy rt foot too!

 
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bidibronco

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So far so good with the balanced assym. If he goes to high with it then I won't get it. I'm not "that" interested in it but would love to have it just to have it I suppose. I just wish I never blew my rear end, went from twin spinning tires to one that may bark a little. Oh well, that's later on down the line. Eh, I'm not worried about it broncobill, I have a decent thickness skin on my bones thanks to the USS Vella Gulf for three years. You sure seem to know a bit more than I do so I'll **** it up like a spounge. I'll let everyone know how it goes though.

 

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