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Putting together a 5.7 block with a 6.4 crank. 9.5 compression 6.1 cam.
This is for a daily driver.
Should I use my new 5.7 eagle heads or clean up the 06 hemi heads?
Matt

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Quote:

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Quote:

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Putting together a 5.7 block with a 6.4 crank. 9.5 compression 6.1 cam.
This is for a daily driver.
Should I use my new 5.7 eagle heads or clean up the 06 hemi heads?
Matt

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Is this a truck? If so, running the eagles may be a problem because I don't think anyone makes a truck 6.1 header. Which you'll need for the eagles.

If this is a blank slate and you've got headers for a 6.1, use eagles. They will be 30+ cfm over a set of first gen 5.7 heads. You'll be fine with the stock springs, but you'll need eagle valve covers.

If you run the first gen heads, at least put 6.1 Exhaust springs on both Intake and Exhaust. There is nothing wrong with either, but eagles are better OOTB.

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Yes in an 03 Dakota. There may not be enough room for the 6.1 factory headers. So stock 5.7 manifold it may be.
As for the heads ,I know the newer heads are better but do I need them.
With the cam I figure the combo will be done at 5500. I was thinking the smaller heads cleaned up on the exhaust side would make more usable power.
Port velocity and swirl would help mpg?
Very interested in your roadrunner project. Matt