Engine build Question - Mustang Boards


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Old 04-22-2009, 12:53 PM
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Default Engine build Question

I know next to nothing about engine building
According to a recent article in MMFF the new FRPP Boss block can safely handle a 3.750 inch bore and 3.800 inch crank equaling 336 ci, translating to 5.5L and greater potential, and bragging rights.

What I'm curious to know is why most engine builders out there are only offering 323ci/5.3L short/longblocks?

I know it must have something to do with the longer stroke 0.5 inches and slightly larger bore diameter. What are the problems associated with this combo that is preventing it from becoming more mainstreem?

Last edited by Teufelshunde3/5; 04-22-2009 at 07:18 PM. Reason: change post
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Old 04-22-2009, 01:17 PM
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Quote:
Originally Posted by Teufelshunde3/5 View Post
First off I know next to nothing about engine building so please keep the sarcasm to yourself.

nice introduction of yourself. Why dont you make a new guy thread and get to know ppl before you make the jackass assumption about the members here??

as to your question... who gives a ****??... bore it out to 5.5L like MMFF says. why question them??...they know their ****. basically...do what you want within the limits the experts state. dont short yourself just cause "some other ppl" said 5.5L is not attainable.
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Old 04-22-2009, 01:37 PM
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Cost, I would think, the block alone is $2k
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Old 04-22-2009, 01:46 PM
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Your right I shouldn't make assumptions. Sorry to have offended you. Original post fixed.

I understand the people at MMFF know thier "****" What I'm asking is why it's not being done? There has to be a reason those engine builders didn't go that big.
Is it soemthing to do with the longer stroke? cost? reliability?
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Old 04-22-2009, 01:50 PM
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R3DN3CK on this site has a 5.5L in his stang. You should look through the huge thread that covers the 5.4l
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Old 04-22-2009, 02:46 PM
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simply enough there's little reason to for all but the most audacious builds. In the modular v8 family you have to go to a sleeved block to accomplish that and you get a pretty thin fire path between cylinders for the head gasket to seal. That's not saying it can't hold it but why tempt fate when you can slap down impressive numbers with a 3.6"-ish bore and a nice wide slab of metal between cylinders.

The boss block has some of the same space limitations as the modular engine and since it's OHC they have to run a slightly slimmer cylinder to make room for the timing set and the front cover. I was hoping they'd mitigate that and give us a 4" cylinder but I guess not. That they've stayed with a 3" and change bore, they'll have designed the heads around that too so more isn't necessarily that much better. The factory isn't concerned primarily with racing, they make pickups for their bread money. Engine builders don't want to because of the warranty issues and the expense involved. They will but you gotta pony up the bread before they'll want to even waste time talking about it. Time = Money
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Old 04-22-2009, 03:13 PM
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The block you're referring to isn't the Boss block. That's the Windsor block made at a 302 deck height. The block you're referring to is the cast iron version of the Cammer block. And the reason why most builders don't offer those sizes is because most work w/ the stock block. Just like how you can get a 302 to be larger than 351ci, there's no point because you can get a 351 for less. Same goes for the Modulars since a 5.4 is much cheaper.
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Old 04-22-2009, 03:44 PM
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http://www.musclemustangfastfords.co...ade/index.html

"The FRPP Boss block allows for a big bore and is considerably stronger than any of Ford's production blocks. These blocks can safely handle 3.750-inch bore and 3.800-inch crank, equaling 336 ci."

Dropping in a 5.4 might be cheaper, but at a cost of how much added weight to the front end?
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Old 04-22-2009, 04:50 PM
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As far as to why you cant get more inches out of the block, personally, I wouldnt want to spend $2k on a block and then bore it to the point of being worthless for being rebuilt. If cost is no object, jump on a GT block.
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Old 04-22-2009, 06:48 PM
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According to FRPP, they don't call it that on the site. If by chance they really do call it by that, then Ford needs to stop whoring out it's one of a kind name for everything.

As for the weight, we're talking about 30-50 pounds. An aftermarket k-member solves that problem. Unless the class you race in demands stock engines (but no displacement limit), these blocks are useless. The Modular blocks, from the factory, are already strong enough for just about anything you can throw at it. Want more than 281 ci? Add a 3.75" crank for 302 ci. Want more? Get a 330 ci.
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