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5.7 VS 6.2/6.4 HEADS #3125244
02/28/23 12:02 PM
02/28/23 12:02 PM
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meanmothermagnum Offline OP
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I'M SURE THIS QUESTION HAS BEEN OVER A MILLION TIMES BUT HAS ANYONE PUT 6.2/6.4 HEADS ON A 5.7? IF SO WHAT GAINS IF ANY DID YOU GET AND WHAT ELSE WAS NECESSARY TO MAKE THE SWAP? THANKS!!!

Re: 5.7 VS 6.2/6.4 HEADS [Re: meanmothermagnum] #3125300
02/28/23 02:05 PM
02/28/23 02:05 PM
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HotRodDave Offline
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They will physically fit and work but you will lose quite a bit of compression and there will be basically no flow improvement as the bigger valve just barely clears the bores and is partially shrouded in the lower lift areas. If I was using a stock 5.7 bore I would not use the larger heads unless I had pistons to make up for the compression loss or was looking for a compression loss so I could run a bunch of boost or something. You can add a small notch to the bore to mitigate a little bit of the flow loss but you can't go very far with that because the ring is so high up on the piston, too big of a notch and you will lose compression past the ring and burn it up very quickly. Other than those concerns they are a direct bolt on for a 2009 and newer 5.7.


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Re: 5.7 VS 6.2/6.4 HEADS [Re: HotRodDave] #3125340
02/28/23 03:37 PM
02/28/23 03:37 PM
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meanmothermagnum Offline OP
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OK, So what about the 6.1 heads? Are they the same way?

Re: 5.7 VS 6.2/6.4 HEADS [Re: meanmothermagnum] #3125362
02/28/23 04:31 PM
02/28/23 04:31 PM
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HotRodDave Offline
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6.1 heads are all the same, they flow a little better on an early 5.7 and will give a little compression bump and a compression drop on the 2009 later 5.7 They flow about the same as a later 5.7 head so not an upgrade unless you need to drop the compresison for forced induction .

If your upgrading an early 5.7 than the later 5.7 head is a great upgrade, you get the best flow on that bore size of any un-ported head and you get almost 12 to 1 compression witch is still pump premium friendly unless you have a bad tune.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 5.7 VS 6.2/6.4 HEADS [Re: meanmothermagnum] #3126267
03/03/23 09:07 PM
03/03/23 09:07 PM
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MattW Offline
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Originally Posted by meanmothermagnum
I'M SURE THIS QUESTION HAS BEEN OVER A MILLION TIMES BUT HAS ANYONE PUT 6.2/6.4 HEADS ON A 5.7? IF SO WHAT GAINS IF ANY DID YOU GET AND WHAT ELSE WAS NECESSARY TO MAKE THE SWAP? THANKS!!!


Too many variables in that question.
If for street use the the early 5.7 are more than enough to make power.
IMO late 5.7 6.4 and 6.2 are too big.
A well thought out set of early 5.7 would easily make 500 to 600 hp depending on block combo.
Now if you are talking about forced induction, than that's a completely different animal.
Matt







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