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Please confirm compression on stock 1970 440 is 10:3 with Eddy RPM Alum Heads.

Started by 1Bad70Charger, December 20, 2009, 02:20:43 AM

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1Bad70Charger

December 20, 2009, 02:20:43 AM
Ok, Leaning towards just building a STRONG 440 motor for my new 1969 B Body that now has basically a stock 1970 440 engine with slightly hotter cam.

No doubt if I don't stroke my current 440 engine and stick with stock 440 displacement that I will be going with Edelbrock RPM Performer Alum. Heads as they are a great piece, especially for the $.

My research shows that if I swap out the Eddy RPM Performer heads out for my stock heads and don't touch the bottem end of  my motor (that was fresly built 300 miles ago) that my compression ratio should come in right around 10:3 to 1.

Kindly confirm that my research is accurate. Thanks in advance for your help this forum Rocks! :cheers:
48 year old Self Employed Trial Lawyer (I fight the ambulance chasers); 1969 Plymouth Roadrunner A12 Tribute Car, Built 505ci; Silver 2008 Hemi Dodge Challenger SRT8, Black 2006 Corvette Z06 427ci LS7-Keep God First, Family Second and Horsepower Third.  Interests:  God, Fast American Cars (old and new), Classic Muscle Cars, German Sheperds, Guns, Animals and the Great Outdoors (sick of Chicago).

firefighter3931

#1
December 20, 2009, 06:59:43 PM
It really depends on the piston to deck height. If the pistons are at zero deck and you use a .040 composite head gasket it will be in the 10.4-10.5 range. Perfect for pump gas !!!!  :cheers:

You definately want the 84cc closed chamber heads for tight quench and detonation resistance.  ;)


Ron
68 Charger R/T "Black Pig" Street/Strip bruiser, 70 Charger R/T 440-6bbl Cruiser. Firecore ignition  authorized dealer ; contact me with your needs

1Bad70Charger

#2
December 20, 2009, 07:56:22 PM
Ron,

Thank you, sounds just about perfert and this is how I am leaning!  :cheers:
48 year old Self Employed Trial Lawyer (I fight the ambulance chasers); 1969 Plymouth Roadrunner A12 Tribute Car, Built 505ci; Silver 2008 Hemi Dodge Challenger SRT8, Black 2006 Corvette Z06 427ci LS7-Keep God First, Family Second and Horsepower Third.  Interests:  God, Fast American Cars (old and new), Classic Muscle Cars, German Sheperds, Guns, Animals and the Great Outdoors (sick of Chicago).

firefighter3931

#3
December 21, 2009, 08:03:27 AM
 :2thumbs:
68 Charger R/T "Black Pig" Street/Strip bruiser, 70 Charger R/T 440-6bbl Cruiser. Firecore ignition  authorized dealer ; contact me with your needs

Scaregrabber

#4
December 29, 2009, 07:28:47 PM
You'll have to see how far the pistons are below the deck. I'm guessing it would actually measure 9.5-1 with the 84 cc heads.

Sheldon
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