MMX 5.7 heads vs 6.4 Heads

[Bigskyroadglide]

Interesting video, comments @Wild one

5.7L HEMI Eagle Heads VS 6.4L HEMI Apache Heads - Tested on the MMX Engine Dyno!

Shop MMX: https://modernmusclextreme.com

youtu.be

 

[Wild one]

Interesting video, comments @Wild one

5.7L HEMI Eagle Heads VS 6.4L HEMI Apache Heads - Tested on the MMX Engine Dyno!

Shop MMX: https://modernmusclextreme.com

youtu.be

The 5.7 Eagle heads on the lower compression truck 6.4 has been a combo i thought would make a wicked towing motor,it comes in around 12:1 so it'd live on pump 91 with a conservative tune . Putting them on the 485 horse 6.4 isn't really feasable in my opinion unless you have access to E85. I'm not sure how long the glass pistons in the SRT 6.4 would handle 13:1,all it'd take is one bad batch of fuel to break their ringlands.
The truck 6.4's have the best piston out of all the later naturally aspirated 5.7's and 6.4's,and might even be a better piston then the old 6.1's had,and it's only a 10:1 motor,so it'll handle the eagle heads better,and it also handles boost better then the 5.7,plus it has a forged crank,which the 5.7's never had

 

[crackerjack1957]

The 5.7 Eagle heads on the lower compression truck 6.4 has been a combo i thought would make a wicked towing motor,it comes in around 12:1 so it'd live on pump 91 with a conservative tune . Putting them on the 485 horse 6.4 isn't really feasable in my opinion unless you have access to E85. I'm not sure how long the glass pistons in the SRT 6.4 would handle 13:1,all it'd take is one bad batch of fuel to break their ringlands.
The truck 6.4's have the best piston out of all the later naturally aspirated 5.7's and 6.4's,and might even be a better piston then the old 6.1's had,and it's only a 10:1 motor,so it'll handle the eagle heads better,and it also handles boost better then the 5.7,plus it has a forged crank,which the 5.7's never had

I guess aluminum heads & tuning have come a long way to run 12:1 compression on 91.
Would think timing would be reduced even more than stock to prevent detonation???

 

[Wild one]

I guess aluminum heads & tuning have come a long way to run 12:1 compression on 91.
Would think timing would be reduced even more than stock to prevent detonation???

There's guys running upwards of 13:1 on pump 94,but you'll want to make sure the tune is slightly conservative.The thing i'd worry about is getting a bad tank of fuel,as that'll take out a piston in a hurry.
The aluminium heads we have now are a far cry from the old cast iron heads we had years ago,back then anything above 10.5:1 was considered a race motor

 

[HemiLonestar]

There's guys running upwards of 13:1 on pump 94,but you'll want to make sure the tune is slightly conservative.The thing i'd worry about is getting a bad tank of fuel,as that'll take out a piston in a hurry.
The aluminium heads we have now are a far cry from the old cast iron heads we had years ago,back then anything above 10.5:1 was considered a race motor

More than a stock 426 street hemi back in the day (10.25:1). Race hemi? 12.5:1. Max wedge? Pick your flavor, 11:1 or 13.5:1

 

[Wild one]

More than a stock 426 street hemi back in the day (10.25:1). Race hemi? 12.5:1. Max wedge? Pick your flavor, 11:1 or 13.5:1

MMX has a deal on for you

Modern Muscle Xtreme​

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We have 3 Sets of custom Higher(er) Compression Drop-In Piston and rod sets available
14.1:1 Compression with OEM 6.4L Head Gasket and 73cc (6.4,6.2 or Aftermarket Head) - These paired with our custom drop in connecting rods are ready to make big naturally aspirated power!
Again, that's a no balance required 14:1 compression set of drop in pistons!
1 Set STD 4.090 Bore
2 Sets +.010 Overbore
Pricing- $2449 Shipped (Pistons, Rods, Rings, Clips, Wrist Pins)
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