2007 Jeep 5.7 dropped vlv seat have to Bore - Page 3 - Hemi Truck Club
 
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Old 11-15-2020, 03:40 PM   #21
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Here is my experience , the early 03-05 blocks are good to 4.08 (depending on core shift), I've gone as big as 4.09 on an 04 block.....it did crack after 1k-1200(been a few years since that build) the 06-08 blocks are good to 4.06(again depending on core shift)
I've done a quite a few 407/410ci (4in boreX4.05/4.08 stroke) some 408ci(4.03 bore x 4.0 crank) and the grand daddy of all 5.7s 445ci (4.06 Bore x 4.30 stroke) and a few others in-between
There are no off the shelf Hemi pistons for anything between 3.957 and 4.055, Dimond Pistons does have a program for 4.0/4.030 that they were doing for Arrington before they sold and closed down in VA, PWR out of Alabama also bought a few sets(not a lot of love out there for PWR)
The trick is SBC or Ford flat tops, For the big dollar race stuff Gibtec or Racetec are your go to suppliers
Now for the None $$$$$$$$$ builds Icon (Ford Application) IC613-std or IC613-030/IC613-060 (.030/.060 over bore) is the best one to use, it's a none offset true flat top [piston with a 1.09 Pin height so it works well with 4.05 crank and 6.125 rods , end results in a -.012 dry assembly deck height,.(006 wet assembly) with Eagle heads and .040 head gasket gives you a piston to head clearance .052-.046 , tight fit, leaves you in the 11/11.5 to 1 compression range with eagle heads.
The 4.08 Crank build you need to use the same Icon Pistons and a 6.10 C to C rod ,it gives you a Deck height of -.022/.016 . you can use .030 head gasket to get you in the 11+ to 1 compression.
Issues with both of these and any other lager then 3.957 bore 5.7 is Head gasket , you need a custom gasket ,Cometic. the 4.10 bore gaskets will leak on the 5.7 blocks because the larger bore gasket is designed to be used with the 6.1/6/4 style deck water passage openings.
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Old 11-15-2020, 05:13 PM   #22
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Quote:
Originally Posted by ric3xrt View Post
Here is my experience , the early 03-05 blocks are good to 4.08 (depending on core shift), I've gone as big as 4.09 on an 04 block.....it did crack after 1k-1200(been a few years since that build) the 06-08 blocks are good to 4.06(again depending on core shift)
I've done a quite a few 407/410ci (4in boreX4.05/4.08 stroke) some 408ci(4.03 bore x 4.0 crank) and the grand daddy of all 5.7s 445ci (4.06 Bore x 4.30 stroke) and a few others in-between
There are no off the shelf Hemi pistons for anything between 3.957 and 4.055, Dimond Pistons does have a program for 4.0/4.030 that they were doing for Arrington before they sold and closed down in VA, PWR out of Alabama also bought a few sets(not a lot of love out there for PWR)
The trick is SBC or Ford flat tops, For the big dollar race stuff Gibtec or Racetec are your go to suppliers
Now for the None $$$$$$$$$ builds Icon (Ford Application) IC613-std or IC613-030/IC613-060 (.030/.060 over bore) is the best one to use, it's a none offset true flat top [piston with a 1.09 Pin height so it works well with 4.05 crank and 6.125 rods , end results in a -.012 dry assembly deck height,.(006 wet assembly) with Eagle heads and .040 head gasket gives you a piston to head clearance .052-.046 , tight fit, leaves you in the 11/11.5 to 1 compression range with eagle heads.
The 4.08 Crank build you need to use the same Icon Pistons and a 6.10 C to C rod ,it gives you a Deck height of -.022/.016 . you can use .030 head gasket to get you in the 11+ to 1 compression.
Issues with both of these and any other lager then 3.957 bore 5.7 is Head gasket , you need a custom gasket ,Cometic. the 4.10 bore gaskets will leak on the 5.7 blocks because the larger bore gasket is designed to be used with the 6.1/6/4 style deck water passage openings.
THANKS! Dam good info their!
I am going with a Custom Piston yes, and custom Cometic Head gaskets.
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Old 11-17-2020, 07:17 PM   #23
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I have 2 of these engines - a 2003 RAM 1500 Laramie quad-cab 4x4 and a 2006 Charger Police.

Regarding the valves, whether it it a design deficiency or a QA issue, it should NEVER have been allowed to continue for over a decade - and nobody has pushed through any recalls. Simply put - it's MOPAR's screwup - THEY should be responsible for correcting it.

That said, the oversight is not JUST the weak valve seat issue, it's also the hi-temp light setting. It's supposed to be a warning enough in advance for the driver to immediately pull over and turn the engine off, but by the time it comes on, it's already too late - more often than not, at least one valve seat has already dropped.

If I EVER get another 5.7 MOPAR (Dodge, Chrysler, Jeep, etc.) The FIRST thing I'm going to do is swap out the heads with a reliable set...
Ha! So do I....160k+ on the original seats AND springs (gasp) in my 2003. Had a 2006 Charger that had 180k+ on it's original heads (before the locals totaled it for me; still have the engine). I take care of mine but I do flog them. I am of the opinion that the the spring thing (while documented) was trumped up to be more than it actually was and the valve seats? Don't let it get too hot lol (I did put a 180 stat in it as insurance though). I was gonna swap heads, but that was because I had a set of eagles to go on. Got a 2005 Magnum with 130k+ that's still rolling with its original heads (put a stat in it too).
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