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Stock HO block limitations ?? 

 

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 Post subject: Stock HO block limitations ??
Posted: Mon Jan 10, 2005 8:52 am 
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Any one know what the HP limitations are for the stock block. :roll:
I've heard they split up the guts. :cry:

Also, what other blocks are an improvement over stock (is there a 4-bolt one ? ) and is there any where in oz that sells them.

I also need some recommendations on someone good to machine it (bore and deck it - square).

Thanks guys. :)

 

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Posted: Mon Jan 10, 2005 9:18 am 
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I believe the standard EFI windsor block is not trustworthy above 500hp.

Mr Landau is in the process of building a stroker engine and has fitted a girdle. There was a great series of posts on FM v1.0.

Maybe try Mr Landau's website as there's lots of good pics on there.

 

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Posted: Mon Jan 10, 2005 10:22 pm 
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EBXR8380 users a Dart block, cost him a penny but he needs it.
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EBXR8380 can probably remember a heap of links to pictures of what happens when you constantly make 500HP @ the flywheel.

Ford Racing Parts produce plenty of blocks to choose from.
http://www.fordracingparts.com/download/catalogs.asp

"World Products" produces performance Ford Windsor blocks.
http://www.worldcastings.com/2004catalog.shtml

Dart blocks
http://www.dartheads.com/fsbiron.htm

 

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Posted: Tue Jan 11, 2005 1:13 am 
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As said, 500hp is about the limit and plenty of guys in the US are pushing those limits quite a bit, especially with forced induction. That rating is for 5L engines, strokers will reduce that further.
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Posted: Tue Jan 11, 2005 10:49 am 
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you could always do a 4 bolt mains and girdle to the stock block.. thats what I plan to do when I stroke mine..

I have seen too many of EBXR8380's horror block pictures.

 

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Posted: Tue Jan 11, 2005 5:50 pm 
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Most of those horror block pictures have been nitrous users. Because N20 increases power in a very short space of time it tends to twist the internals very hard and screw things up bigtime - whereas a N/A non nitrous motor can get closer to 5-600 without destroying too much gear. Unfortunately - unless you have big compression and raise the upper rev limit to 7500- 8000, it would be virtually impossible to make 500n/a HP. The standard 5.0 block is flexible but a main girdle will not stop a stock block from cracking - just hold the bottom end together so you know where it all is when it goes bang.
Shane

 

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Posted: Wed Jan 12, 2005 8:01 am 
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MrLandau wrote:
The standard 5.0 block is flexible but a main girdle will not stop a stock block from cracking - just hold the bottom end together so you know where it all is when it goes bang.
Shane


Do you think that the addition of a girdle will save my internals and heads (as thats where all the money is my donk) in the event of a block splitting ?

I think I am pushing around the 450hp mark, do you think I will run into any problems? Is it worthwhile getting a girdle?

 

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Posted: Wed Jan 12, 2005 8:59 am 
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A girdle won't help too much, but it will hold it together if it does..Btw the gearbox / bellhousing does a good job of that also..
Trouble is the main webbing is too thin...
But serously we are talking big power levels and driving "like you stole it" to break these blocks..It seems though the latter the blocks the thinner they are, especially with the runout h.o/ roller blocks...The lighter the rotating mass and the better ballanced the better..Imo a stroker with neutral ballance should be better....
The std hydro rollers won't let engine rev too high either, lighter mech lifters would be required to rev higher than 6500 rpm...With eec rev limit of 6250 removed...

 

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Posted: Wed Jan 12, 2005 3:07 pm 
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The main idea of the girdle is to stop bearing "fretting" due to main cap movement. The longer main studs tie into the girdle which in effect - stiffens the main tunnel. The problem is - the main tunnel is only one of the weak spots - a lot of these blocks have cracked the whole main tunnel out of the block - most crack right down the centre of the lifter valley and break the block in half. From what I have seen on Corral - most of these broken blocks have been Nitrous users or people spinning there motors well over 7000rpm. On a stock block - the girdle is all you can do to try and save your reciprocating assembly if the block does crack - but if you want to se nitrous or a big power adder you need to be looking at a better block like the Dart or Ford motorsport R block.
And you 351 Windsor guys don't laugh - your blocks do exactly the same thing when the power level goes up...
Shane

 

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Posted: Thu Jan 13, 2005 8:42 am 
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Thanks for all the insight guys :wink:

I think that since I am not blowing or gasing the donk I should be OK with a standard block as I am only going to be taking it to 6500rpm and expecting about 430hp mark out of the 331.
Time will tell. :roll:
If it does split where they usually do then my heads should be pretty right anyway, and thats where most of the money is in this donk.

I'll keep my fingers crossed :lol:

 

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Posted: Thu Jan 13, 2005 6:23 pm 
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So - tell us the spes of the motor :D
Shane

 

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Posted: Fri Jan 14, 2005 7:41 am 
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AFR's, RPM II, 75mm TB, 80mm MAF, 30lb's, Custom cam(very juicy),Standard EEC V (will be changed once I have finished fiddling, maybe when chasing additional power !) :twisted: :evil: :D

 

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Posted: Fri Jan 14, 2005 12:52 pm 
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Sounds pretty close to my specs - AFR 185's, TrickFlow R manifold, 75mm Accufab TB, 42lb/hr injectors, XE282HR cam - but mines a 347.
Shane

 

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Posted: Fri Jan 14, 2005 1:12 pm 
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MrLandau wrote:
Sounds pretty close to my specs - AFR 185's, TrickFlow R manifold, 75mm Accufab TB, 42lb/hr injectors, XE282HR cam - but mines a 347.
Shane

Yours must have some serious poke about it as well.

That cam of yours is very close to whats in mine as well, nice and rough. Have you managed to get any dyno figures on that beast ?

Are you running a standard ECU or have you had to change it.
I'm still running the standard one and am wandering how much its holding it back (besides the 6250 rev limiter) and also how much better drivability you get going aftermarket as mine is a manual an a little bit of a hand full when taking off (as I was expecting it to be), but it a little lurchy when cruising at steady speed.

Rob.

 

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Posted: Fri Jan 14, 2005 1:47 pm 
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Mine is still on the engine stand :cry:
I have been busy trying to keep the would be GF happy the last couple of months and haven't finished it. A few peices (like my cam) haven't rocked up from the overseas suppliers but I am hoping to recify it next month
Shane

 

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