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Mustang Technical Discussion > Pre 1973 > Engine shenanigans... > Community Forums > Mustang Forum Australia - Mustang Tech

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trav68
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What is wrong with yours Luke? Haven't followed your build closely but thought it just went together!


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boofhead
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lukep6470 wrote
boofhead wrote
Laughing I have a very good plan for a high strung 302 - I am talking a 7.5 - 8k target RPM peek HP. Any way, if you want to talk about it feel free to chat.


I've been thinking about the rebuild of my Dart block and you can apparently get to 347 buy using a 331 stroke and 4.125 pistons. This would make a 347 that will want to rev as well as unshrouding the valves.


You have the Dart block so I agree to bore it so it is 4.125 minimum is a great move - now you have the 3.4 inch crank and rods already so only pistons are needed. Your suggestion is true to a degree but save money on a crank and simply build a 363. I would put the money into a different cam - I frankly do not like your cam so I would sell it or toss it (or put it on a shelf to show people). I am happy to talk and then suggest a new (custom) one for you.


I will someday think of something clever to say.

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lukep6470
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trav68 wrote
What is wrong with yours Luke? Haven't followed your build closely but thought it just went together!


It drove fine for 50Kms until a seized open injector hydrolocked it. I have a sump full of metal now.


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lukep6470
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boofhead wrote
lukep6470 wrote
boofhead wrote
Laughing I have a very good plan for a high strung 302 - I am talking a 7.5 - 8k target RPM peek HP. Any way, if you want to talk about it feel free to chat.


I've been thinking about the rebuild of my Dart block and you can apparently get to 347 buy using a 331 stroke and 4.125 pistons. This would make a 347 that will want to rev as well as unshrouding the valves.


You have the Dart block so I agree to bore it so it is 4.125 minimum is a great move - now you have the 3.4 inch crank and rods already so only pistons are needed. Your suggestion is true to a degree but save money on a crank and simply build a 363. I would put the money into a different cam - I frankly do not like your cam so I would sell it or toss it (or put it on a shelf to show people). I am happy to talk and then suggest a new (custom) one for you.


I haven't looked at the cam yet but it may have damage anyway. I was thinking a 266 might be the go the 2nd time around.


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trav68
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You must have been gutted! Good luck with the remediation plan.


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boofhead
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lukep6470 wrote
boofhead wrote
lukep6470 wrote
boofhead wrote
Laughing I have a very good plan for a high strung 302 - I am talking a 7.5 - 8k target RPM peek HP. Any way, if you want to talk about it feel free to chat.


I've been thinking about the rebuild of my Dart block and you can apparently get to 347 buy using a 331 stroke and 4.125 pistons. This would make a 347 that will want to rev as well as unshrouding the valves.


You have the Dart block so I agree to bore it so it is 4.125 minimum is a great move - now you have the 3.4 inch crank and rods already so only pistons are needed. Your suggestion is true to a degree but save money on a crank and simply build a 363. I would put the money into a different cam - I frankly do not like your cam so I would sell it or toss it (or put it on a shelf to show people). I am happy to talk and then suggest a new (custom) one for you.


I haven't looked at the cam yet but it may have damage anyway. I was thinking a 266 might be the go the 2nd time around.


A 266? More information needed.


I will someday think of something clever to say.

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nassi
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trav68 wrote
Boof you have no faith! I have clocked up over 5000kms on the new stroker over the last 5 months so it is getting close ( nassi's only made about 6000km in my ride).

Was thinking a highly strung stock stroke 302 might be an interesting option....


Damn, I thought it was new not second hand... Thought it was just in your car for storage.


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lukep6470
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Sorry XE266HR.


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Shaunp
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Luke I agree with Boof 363 is the go, for sure and you need a bigger cam, what heads do you have. I suggest you bring the Block down to Wynnum engine for any machine work, they do all the machine work for Fataz Racing engines, I'm happy to drop it down and you will then get my rate, rather than walk in price. I would recommend a minimum of a 274 XE in a 363 if not a 282. Will need to have the rods checked and aligned and check the crank is straight. mild 363 will run close to 500 hp


Last edited by Shaunp on Tue Nov 24, 2015 9:54 pm; edited 1 time in total

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boofhead
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lukep6470 wrote
Sorry XE266HR.


I really like the XE lobes and have used many of their cams. My two favorite off the shelf Cams is the XE266HR and the XE274HR so by default I tend to go the XE266HR for a street performance 302 build and the XE274HR for a street 347 (or 351). My 302 is currently running a Custom cam inspired by the XE266HR though more aggressive lobes. It works well for my build though I would think a (slightly) larger cam would be a better choice for a 363.

Having said that I am not sure of your goals? So what are you looking for from your 363?

I know those Brodix heads are excellent, I know your have rockers setup designed to handle high revs. I am not sure what Springs you are using on the heads (which will have an influence on Cam choice) - do you know?

I have some thoughts - need to understand exactly what you want from the engine.


I will someday think of something clever to say.

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Shaunp
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Could use the Woody formula for a quick one!


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boofhead
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Shaunp wrote
Could use the Woody formula for a quick one!


Yes that is an option though the added overlap he likes would not be so well suited to an auto while a manual would be less of a concern. I would expect a smaller cam is what Luke is looking for - possible around or just short of 230@50 though more around 112 centers to reduce overlap. Maybe 110 if mid range power is the focus. It does depend on the converter and gearing as well. The XE266HR would result in it behaving almost like a stock engine in a 363.


I will someday think of something clever to say.

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lukep6470
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I've only pulled the heads off so far and they look OK. They are setup for hydraulic roller as the springs aren't OTT.

I'm runing an AOD with a 2800 stall and 3.55 gears. Keeping a decent vacuum with the 8 stack is important for the ECU. I would be thinking a relatively smooth idle (Minimal lope as the AOD hates that) at 850RPM max.


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Shaunp
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needs a lower diff


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boofhead
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Ok so what about a cam with zero overlap @50 though decent lift (though I would like to know more about the springs on those heads).

I am thinking:
Intake: XE lobe [3192] 224@50 .604 lift
Exhaust: XFI lobe [3037] 236@50 .571 lift
with a 115 separation advanced 2 deg [Intake on 113 and exhaust on 117].


I will someday think of something clever to say.

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