Boss 5.0 Modular Block (iron)

[Department Of Boost]

I'm with you on the pushrod motor.

My next motor is going to be a push rod motor. A 650+cu in push rod motor with three stages of nitrous!

 

[ethic1]

I should know within a few months how well they hold....

 

[JPO8GT]

I'm waiting for turbo kit to be done and I'll find out. I plan on running 20psi street tune on 93 octane and somewhere around 28-30 psi on C-16.

If it breaks I'm building a small block push rod motor to stick in it. I have been skeptical of the boos blocks since I bought mine.

my cousin just built a big bore 351 dart block stroked and poked to 461 cubic inches with victor sr heads 690 lift cam in a 90 fox coupe. With boost i probably wouldn't go that big but he is a spray car. Much stronger than modular but race car only im down with push rod there is no such thing a mpg its a gas guzzler should be rated at feet per gallon.

 

[8306gt]

The problem is that there is no telling what is going on till it is pulled down. Or it chucks stuff out of it.

It could be as fresh as the day it was built. On the other hand it could be one trip to 7,500rpm from going pop.

I'm just not sure if I am willing to risk the unknown reliability, add the extra weight and pay the extra cost for bigger bores. This sucks, I wish there was an easy answer.

I am not to worried about it chuck anything out, but then again anything is possible. I am more concerned about detonation killing pistons, head gaskets, and rod or main bearings at the realitively high boost on pump gas than anything else.

As for the weight I don't think you will ever notice the difference while driving the car. Yes its heavier but realistically it's only about 60 lbs which is easy enough to lose most of it by doing the light weight K member and rad support.

I would say for a street car completely reliable, and I believe someone from JPC commented that they pushed the mains out at somewhere around 1300 to 1400 hp which is way more than I plan to make so I am happy with my choice. As for the extra cost there wasn't really any for me as I had broken my 3v block, and at $1200 the big bore was quite reasonable.

 

[TurboX]

What kind of crank broke? How much is the billet conversion with the block?

Kellogg 3.75 Stroke, check PM for idea on prices.

What do you have for a power adder? Where did the crank break? Got pics?

Hellion Turbo Kit with Turbonetics Q trim running 18-20psi and right at 800RWHP at the time. It broke at #4 rod journal, again I was told my the engine builder doing the tear down, he has seen it happen.(This was not same builder that built the motor,totally unbiased opinion besides being buddies with the tuner)

Gee thanks. You guys get me in sooo much trouble. Gonna call my machine shop tomorrow and ask a few questions about this.



Please tell me that was not the new motor...

Nope, Same motor that broke about a year ago. The rebuilt has been slow, I was extremely busy with work the 2nd 1/2 of last year. The good thing was, that gave me more money to spend on wifes shoes, handbags and car parts for me. I cant complain I was busy, bonuses were coming in, that led to bigger better Turbo, every bell and whistle on short block, every bell and whistle on heads, JPC intake and may as well get new cams

I'm waiting for turbo kit to be done and I'll find out. I plan on running 20psi street tune on 93 octane and somewhere around 28-30 psi on C-16.

If it breaks I'm building a small block push rod motor to stick in it. I have been skeptical of the boos blocks since I bought mine.

I looked into the same thing, reason I didnt was because I want to retain all the creature comforts like AC, Cruise Control, Stereo etc etc etc....... Modulars can make power but I dont care what block or what magical part you have, they do not have the longevity of pushrod. Downside is pushrods dont have the street ability, I guess you gotta pick whats best for your needs, right ?

 

[Wicked97]

I thought i would chime in here. Sorry i missed this whole thread the shop has been crazzy busy.

1st one question i saw in here is do we even run this mod. The answer is YES. All our Customers that have made any kind of big power more then 2 times have this mod.

1. The Twin Turbo Car we built in 2009-2010 has is
2. GTRO
3. JeoStang
4. Justins old 3V had it.

Thats just the list of forum guys you might now or build we have shared on the forum.

this MOD isnt for everyone as it it pricey but it works

We started working on this after we we broke 2 cranks in justin's engine. MOST of the issues we have seen have been on High Boost Blower cars since you get alot load on the snout of the crank. We actually didnt crack the crank in Justins car it came out of the engine in 2 pieces. it pretty much destroyed everything.

This mod does work and we have been doing it since like 2008 maybe even longer than that. Its been tested looked at and inspected in every way.

We knew this 2 bolt main thing would provide to be an issue the second we got our hands on the 1st one. Hence the custom caps.

Ill do my best to answer any questions i tried to pick up on most of them in the thread but this thing is like 4 pages so any way if i missed some thing ask away

Thanks Guys

 

[JPO8GT]

Eric thanks for reply on this.

On the crank issues are you seeing them only related to a specific blower mfr i know i have seen info on occasion where Procharger blowers have broken cranks and i know there step ratio on some models 5 and change to :1 plus they have cog and (12 rib 2 belt setup)
Have you seen these issues with novi 2200 or ysi using standard single 8 rib setup? Also curious if manual vs auto trans makes difference i am sure that could depend on launch rpm etc.
thanks Jamie

 

[Dillon Dollar]

Do yall think a main cap upgrade eould be necessary with a Paxton 2200 turned all the way up on E85

Sent from my SPH-L900 using Tapatalk 2

 

[JPO8GT]

Ditto ^^^ same thing I'm trying to figure out I'm already running mine with auto trans with out the cap upgrade.
all i need is another reason to tear into my boss block again.
So far been good just wanting to know my risk facto if possible.
And if deemed necessary i can start preplanning for cap upgrade in future.

 

[Wicked97]

I have seen more of an issue with the larger Prochargers but its not to say it couldnt happen with a YSI or something in the V7 Family

 

[Dillon Dollar]

Well ill know soon I just ordered my block 10 minutes ago lol

Sent from my SPH-L900 using Tapatalk 2

 

[JPO8GT]

I have seen more of an issue with the larger Prochargers but its not to say it couldnt happen with a YSI or something in the V7 Family

Well this makes me feel better i know the Paxton & Vortech 8 rib is more forgiving than the procharger

 

[Dark_horse]

I should know within a few months how well they hold....

Me too... And the damn thing better lol

 

[Dark_horse]

After reading Aarons input on the issue I feel a little better being a turbo application...

 

[05stroker]

I have seen more of an issue with the larger Prochargers but its not to say it couldnt happen with a YSI or something in the V7 Family

Thats why I built a crank support for mine and double keyed the crank and balancer to help take the side load off the crank. I was really shocked when I put my IW balancer on my Kellogg crank and it was only on the 3/4".

 

[ethic1]

Eric have you seen any issues on turbo cars without the mod?

 

[Wicked97]

Eric have you seen any issues on turbo cars without the mod?

No i have not but that is because all the big power turbo cars we have done have this mod already.

we honestly have never felt real warm and fuzzy about cranking a 2 bolt main car thats only 320 inches to over a 1000 hp

 

[JPO8GT]

I know ford racing makes main cap girdles for push rod and i think dss has a main support system for modular blocks.
Now my wheels are turning and i can get a little over kill on a build but when your looking at turbo options like i am i tend to think of it all for what its worth were going over kill on power.
How about a JPC/RGR main cap upgrade 4 bolts on each cap plus side bolts making it a 6 bolt main
Then top that off with a main cap girdle / support plate that ties all five main caps together?.. Just a lil more insurance never hurt no one. and turbos are capable of ridicules power so maybe the thought of this isn't a bad idea.
Who know s some one may have already done this in combination with the RGR caps?

 

[wabirch]

For what it is worth, I was told that RGR has priced this to something in the 5k range.

 

[flyfaster1]

As in the custom main setup through JPC, via RGR??.. haven't seen this thread in awhile.