Stock block split 3 mains. - Forums at Modded Mustangs
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post #1 of 31 Old June 28th, 2016, 10:19 AM Thread Starter
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Stock block split 3 mains.

Hey guys haven't been on much lately due to work and life but my stock block 331 with a vortech supercharger finally kicked the bucket the other day, was driving it and after a couple hard pulls it sounded like a rocker came loose, so I shut it down instantly, upon opening it up found a lifter was stuck due to a cam bearing had started to walk, and then found that mains 2,3,4 were cracked pretty good lol. On a good note my stroker kit and cam were ok and reusable, so I am now looking at an aftermarket block and deciding between dart or a boss block, looking for input on which is better or Any issues with either of them. Thanks.


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post #2 of 31 Old June 29th, 2016, 09:23 AM
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6 in 1, really. The Boss blocks don't like 347" strokers, and you don't have one, so it doesn't really matter. Whichever one you can get cheaper, really.

That being said, you could also consider the possibility of going to a 4.125" bore at this point.

I know you said everything survived, but take a close look at the crankshaft. It might be worth it to have it cleaned, magnafluxed, and checked for straightness.
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post #3 of 31 Old June 29th, 2016, 10:27 AM
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You can never go wrong with Dart.

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post #4 of 31 Old June 29th, 2016, 08:19 PM Thread Starter
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Originally Posted by WillyT View Post
6 in 1, really. The Boss blocks don't like 347" strokers, and you don't have one, so it doesn't really matter. Whichever one you can get cheaper, really.

That being said, you could also consider the possibility of going to a 4.125" bore at this point.

I know you said everything survived, but take a close look at the crankshaft. It might be worth it to have it cleaned, magnafluxed, and checked for straightness.
Yea everything is at the machine shop now being checked to make sure the entire stroker kit is good to go. Don't wanna just eye it and hope for the best lol
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post #5 of 31 Old June 29th, 2016, 08:22 PM Thread Starter
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Originally Posted by WillyT View Post
6 in 1, really. The Boss blocks don't like 347" strokers, and you don't have one, so it doesn't really matter. Whichever one you can get cheaper, really.

That being said, you could also consider the possibility of going to a 4.125" bore at this point.

I know you said everything survived, but take a close look at the crankshaft. It might be worth it to have it cleaned, magnafluxed, and checked for straightness.
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You can never go wrong with Dart.
just picked up a dart shp block for $1,600 bucks

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post #6 of 31 Old June 29th, 2016, 11:46 PM
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post #7 of 31 Old June 30th, 2016, 02:35 AM
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I've heard good things about the Dart...
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post #8 of 31 Old July 20th, 2016, 01:10 PM
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First, well done on breaking the block! Mine was held together by the bellhousing. lol.

Secondly, excellent choice on the Dart block. Upgrade the hardware to ARP and check everything for straightness. Better choice than the boss. I've owned two boss blocks and I wouldn't put anything over a 3" stroke in them. Cylinders are just too short at the bottom for any kind of stroke. Like to meet the dumbass engineer that made that decision. You won't regret the dart.

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post #9 of 31 Old August 18th, 2016, 12:57 PM Thread Starter
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First, well done on breaking the block! Mine was held together by the bellhousing. lol.

Secondly, excellent choice on the Dart block. Upgrade the hardware to ARP and check everything for straightness. Better choice than the boss. I've owned two boss blocks and I wouldn't put anything over a 3" stroke in them. Cylinders are just too short at the bottom for any kind of stroke. Like to meet the dumbass engineer that made that decision. You won't regret the dart.
I have upgraded all the hardware to arp and the block has been machined and is being assembled this week, the re build has been moving a lil slow up until now, focused on studying for my journeyman electrician state exam for the past month, now that I passed that and have my journeyman's license I can now focus on the project again. I'm hoping to have the motor back in the car in a couple weeks.

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post #10 of 31 Old September 20th, 2016, 10:42 AM Thread Starter
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Short block is finally going together lol. Been so busy happy to finally be moving forward on this project.


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post #11 of 31 Old September 20th, 2016, 09:53 PM
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Good freakin' deal! I like seeing progress. Hopefully I'll have some within the next few years...

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post #12 of 31 Old September 23rd, 2016, 12:29 PM
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You can never go wrong with Dart.
DART is on my wishlist for the longest time if my engine blows but it hasn't.

---------- Post added at 04:29 PM ---------- Previous post was at 04:27 PM ----------

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just picked up a dart shp block for $1,600 bucks

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post #13 of 31 Old December 19th, 2016, 02:38 PM Thread Starter
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Been pretty busy lately but got some progress done on the build.. motor is now assembled and going back in the car, new coan th400 tranny, and convertor was delivered, new long tube headers, new custom grind comp cam and spring kit, new b&m shifter, aeromotive dual phantom fuel pump setup

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post #14 of 31 Old December 19th, 2016, 02:46 PM Thread Starter
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Stock block split 3 mains.-20161216_15375211.jpg

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post #15 of 31 Old December 19th, 2016, 02:48 PM Thread Starter
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B&M shifter mounted and installed..

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post #16 of 31 Old December 25th, 2016, 11:42 PM
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do you know what horsepower was it making?
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post #17 of 31 Old December 26th, 2016, 02:09 AM
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I'm late to the party on this thread. Not sure why I didn't see it sooner.

What hp/tq were you making on the stock block? What rpm? Were you using a main girdle or valley girdle? Any block fill? Neutral, 28oz, or 50oz balance? Any signs of cap chatter?

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post #18 of 31 Old December 26th, 2016, 02:53 PM Thread Starter
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do you know what horsepower was it making?
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I'm late to the party on this thread. Not sure why I didn't see it sooner.

What hp/tq were you making on the stock block? What rpm? Were you using a main girdle or valley girdle? Any block fill? Neutral, 28oz, or 50oz balance? Any signs of cap chatter?
Lived for 2 summers on a Conservative tune of [email protected],500rpm and [email protected],700rpm on 9lbs of boost at the rear tires My tuner put a Lil more aggressive tune in her and she spit out 496hp and 503tq at the tires and after 3 more dyno pulls and a couple of 100mph+ street pulls the block split lol. Never spun the motor pass 6,000rpms. No main girdle or valley girdle, no block fill, neutral balance, no signs of cap chatter just split mains 2,3,4 and cam bearings started to walk forward. Luckily car stalled as it happened doing a pull on the street, fired it back up sounded like a loose rocker so I shut it down, saved my internals to dump into my dart block. The car was a blast how it was on the conservative tune, took it to the track once and got a [email protected] with a shitty 2.2 60' but I will never build a boosted stock block 302 again lol lesson learned.

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post #19 of 31 Old December 26th, 2016, 08:49 PM
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I wouldn't say never. The car was a blast at 450whp, right? It only split after you started leaning on it harder. I'd say it held pretty well, all things considered.

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post #20 of 31 Old December 26th, 2016, 11:56 PM Thread Starter
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I wouldn't say never. The car was a blast at 450whp, right? It only split after you started leaning on it harder. I'd say it held pretty well, all things considered.
I have no regrets with the stock block build, yes it was a blast and held up fine until I decided to start testing it's limits I should of known better but Im a tard and can never leave well enough alone, that's y ill never do a boosted stock block 302 again, I always want more power lol my own fault. But Now I can do the dart block build I've always wanted to do.

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