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post #1 of 60 Old January 29th, 2011, 09:51 PM Thread Starter
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5.3 Boss Mod Stroker

I've been looking at MMR's shortblocks lately and noticed that I could make a 5.3 block. I was wondering if anyone has any experience with this. Is it safe to increase stroke on top of the increased bore (and I'd imagine heavier/ wider pistons)? Also, what kind of supporting mods would be required to run with so much more displacement? Would it require new cams to run properly or would a tune suffice if keeping stock heads/cams? What about fuel issues?

I feel like there isn't much information about this idea, but it seems so simple and the increased displacement would really wake up the low end and the extra bore would open the valves up more. Why don't more people opt for this, beyond the extra $1500 the block costs? There must be a catch.
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post #2 of 60 Old January 29th, 2011, 09:55 PM
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Do it. It honestly depends what/how far your going in. If you want a badass N/A car above 400 to the wheels. this is the way to go.

I plan to throw a single turbo on top of my setup when done.

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post #3 of 60 Old January 29th, 2011, 10:07 PM Thread Starter
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I'm afraid to spend 5k+ on the shortblock only to find out that I need another 5k in supporting parts just to run the thing properly, but if it's not likely to turn out to be a grenade using stock parts, I wouldn't mind having something so nice as a ground floor for future mods.

I see that you're using the block for a build, have you found that you needed to get more than sort of typical shortblock nonsense (flywheel that fits, bits and pieces that don't fit from the old block, replacing worn out stuff)?

I really want to do it for the strength of the block, the fact that my head gaskets are leaking anyway, and the idea that it would make awesome N/A power (the cool factor of having 42 more ci than stock is more than enough incentive though).
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post #4 of 60 Old January 29th, 2011, 10:13 PM
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I know for sure that it uses a different oil pump line. Kinda have to custom one up. Other than that. You can use all stock parts, ect excluding pistons sine you need bigger ones.. Think of a stock block. Bored out and sleeved. thats what it really is. with minor changes to coolent passages.

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post #5 of 60 Old January 29th, 2011, 10:17 PM
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But the stroker block will need a whole new rotating assembly ect. When you take it to a engine builder they will figured out and decide what you need for all the little misc stuff to put together into a shortblock. Or just go to MMR's site and buy one for a decent price.

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post #6 of 60 Old January 29th, 2011, 10:18 PM
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I would think the big bore option would yield some pretty good results, but the stroker part really depends on what you will be doing with the car IMO.

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post #7 of 60 Old January 29th, 2011, 10:47 PM Thread Starter
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Thanks MikeJones! I'm just going to do it through MMR, it's easier that way as I don't know any engine builders personally, so I'd rather contract it out to people who have done it before. Reps to you.
What do you mean tbird? I've seen N/A and blower strokers that haven't had any problems and it adds a decent amount of torque to the mix. What situations are strokers not a good idea, as I haven't yet made up my mind about plans beyond a built block? I'm debating with myself about staying naturally breathing or going with a kenne bell blower (definitely not turbo or centri through, if that makes a difference).
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post #8 of 60 Old January 29th, 2011, 10:52 PM
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Quote:
Originally Posted by nileppezdel77 View Post
Thanks MikeJones! I'm just going to do it through MMR, it's easier that way as I don't know any engine builders personally, so I'd rather contract it out to people who have done it before. Reps to you.
What do you mean tbird? I've seen N/A and blower strokers that haven't had any problems and it adds a decent amount of torque to the mix. What situations are strokers not a good idea, as I haven't yet made up my mind about plans beyond a built block? I'm debating with myself about staying naturally breathing or going with a kenne bell blower (definitely not turbo or centri through, if that makes a difference).
for an easy explanation, stroked motors rod angles can give you upper rpm limits that may hinder ultimate power production, especially N/A.

don't let size fool you, a stock bore & stroke 4.6 can make tons of power, best to get a better idea of what you want to do with the car/etc before you order anything.

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post #9 of 60 Old January 29th, 2011, 11:02 PM
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Originally Posted by nileppezdel77 View Post
Thanks MikeJones! I'm just going to do it through MMR, it's easier that way as I don't know any engine builders personally, so I'd rather contract it out to people who have done it before. Reps to you.
What do you mean tbird? I've seen N/A and blower strokers that haven't had any problems and it adds a decent amount of torque to the mix. What situations are strokers not a good idea, as I haven't yet made up my mind about plans beyond a built block? I'm debating with myself about staying naturally breathing or going with a kenne bell blower (definitely not turbo or centri through, if that makes a difference).
Like Casper said, strikers can hinder the motor's ability to freely spin high rpms like a stock stroke motor. The torque gained will be somewhat insignificant when these cars really need to spin high rpm to start performing.

I would think a KB or Turbo build would be the only setups I would consider putting a stroker in. For N/A, you want high rpm which a stroker is not good for. KB won't need a small handful of torque down low. Not for $1500. With a built bottom end and a KB, all you are gonna need is the right pulley size and a good tune to meet whatever goals you have.

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post #10 of 60 Old January 29th, 2011, 11:56 PM Thread Starter
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I understand what you are saying about N/A, needing to run to higher RPMs for the most power N/A, but I'm certainly not looking for a 9k RPM 600hp N/A build.

My goal for the car is to have a fun, fast car to enjoy on weekends and occasionally go to the track with, but not for competition, just for fun. I want a block that will last a long time even if I abuse it the entire time I use it because ultimately, the engine I build for this car is going into a Cobra Kit-car down the line.

I want the big bore block no matter what, it unshrouds the valves and appears to fix the passenger side head gasket cooling issues, which is a huge plus. But I think that for my purposes, an upper RPM limit won't hinder my fun, as the lower torque increase will make up for it.

I didn't mean to start a stroker/ non-stroker debate though. I know the ultimate disadvantages of the stroker in the mod engines, I just thought that you meant that there was a problem with using a longer stroke on the boss block in particular.

The stroker kit's only $400 more when ordering the shortblock, and since I won't be seeing a power-adder for a while after getting the shortblock anyway, I think it's worth it. I just want to know if there are reliability issues with it on the larger bore.

Thanks for the advice anyhow, any feedback is helpful to me here.
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post #11 of 60 Old January 30th, 2011, 01:22 AM
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ehhhh, yes and no to a bunch of this. The stroke on a 5.3 is 3.75 or 3.8 dont remember, not a lot of stroke, with a bore of 3.700 it brings the motor almost back to square which is never a bad thing. One of the great things with the big bore kit is that it unshrouds the valves in the head and thats a huge help/gain with the head design. My current project consists of the same 5.3 stroker, and I plan to see every bit of 8500 at the shift points

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post #12 of 60 Old January 30th, 2011, 01:32 AM Thread Starter
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What intake are you going to use to get there?

Good to know someone else is doing it though, when do you hope to finish the build? I'd like to follow along with the results. You had a thread about it not long ago, am I right? You're using TFS heads too?
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post #13 of 60 Old January 30th, 2011, 01:34 AM
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nope, Im using ported 3v heads, and the JPC intake. Build should be done in the next few months, it comes in spurts as money comes and goes and as the sponsors send their money/parts/help. Going in a 00 GT

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post #14 of 60 Old January 30th, 2011, 01:40 AM Thread Starter
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Very cool. I'm anxious to know how it turns out. I'm looking at September to have the shortblock in car and running. Would've liked to have been in the summer, but at the rate that I'm saving money for it, I'm not going to be able to order it until June at best.

Anyway, I'm going to anxiously await the results of your build and MikeJones' as well.
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post #15 of 60 Old January 30th, 2011, 01:44 AM
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Staying N/A were hoping for 450(shooting low, so were not disappointed) but def wouldnt be shocked if it made more. Motor should be almost 13:1 and running on E85

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post #16 of 60 Old January 30th, 2011, 01:50 AM Thread Starter
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Awesome. I guess, considering the fact that you have sponsors helping you and you're doing everything to the extreme, this is a racecar, not your DD. That being the case, why 3v and not 4v? The effort to put a 3v into a New Edge is more than a 4v isn't it?
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post #17 of 60 Old January 30th, 2011, 01:57 AM
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Not full sponsors per say, breaks in parts/labor/services that normal customers wouldnt get. Its def a "race car" but its still got tag/title/lights etc on it.

3v's arent in the light like the 4v's are. 3v's are lighter, when properly ported flow 300cfm+ on the intake and over 185cfm on the exhaust. Its an easier bolt in than 4v's. Plus I believe from all the digging ive done the N/A 3v record is around 10.6x at almost 124mph out of a 5.4 truck engine with some work. I mention that b/c thats what the target is, to top the current N/A 3v spot.

Its actually not that extreme of a build. Saleen stroker crank, good rods, big bore pistons, Big bore boss block. .020 head gasket, worked heads, Off the shelf JPC intake and a C4 with lots of convertor and some gear. Stock style sustpension and a 325/50/15 tire. All the parts can be bought per part numbers out of catalogs, other than the pistons, were having them custom made to put a 2-3cc dome in them to help bring the compression up

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post #18 of 60 Old January 30th, 2011, 02:06 AM Thread Starter
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I see; I didn't know that about the 3v, but it makes sense. It sounds like you'll probably best it. I doubt it would be "streetable" in any way though. Good luck!
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post #19 of 60 Old January 30th, 2011, 02:26 AM
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Quote:
Originally Posted by casper gt View Post
for an easy explanation, stroked motors rod angles can give you upper rpm limits that may hinder ultimate power production, especially N/A.

don't let size fool you, a stock bore & stroke 4.6 can make tons of power, best to get a better idea of what you want to do with the car/etc before you order anything.
like caspers said the fastes n/a gt is 288 cubic in....and they are guys with 281 cubic in make 2300hp....


and are you wanting n/a or a power adder?

a bunch of shit lol..
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post #20 of 60 Old January 30th, 2011, 02:27 AM
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and if your stayin n/a with some decent compression your not going to make any power if you keep stock heads and cams on that thing...

a bunch of shit lol..
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