2007 Jeep 5.7 dropped vlv seat have to Bore - Hemi Truck Club
 
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Old 11-02-2020, 05:19 PM   #1
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2007 Jeep 5.7 dropped vlv seat have to Bore

Hello all
Im new here, I have an 07 5.7 in a Jeep Commander.
Long story short it dropped a Valve in #7 cyl and did a number on the Bore.
I bought it this way I never heard it run just Hauled it home and tore it apart.

Head is trashed, Bore not much better BUT My machinist says he thinks I can get a 6.1 Piston in it?

I have spoken to a few suppliers they say no adamantly, while what I read says Chrysler did this to make the original 6.1s to begin with.

I spoke to Scat about a Piston and a stoker crank depends on who you speak too there but will sell you anything you want.
I also spoke to Hughes who says NO! cant bore it that big But again will sell me the parts.


I want to bore it to a 6.1 4.055 with a stroke of 4.050 BUT I don't need over heating issues as I live in Death Valley.

I also wanted to install the Oil squirters the 6.1 has But the guy at Hughes says cant be done with the stroker kit, crank will hit????

I have already purchased set of Eagle heads and had them rebuilt springs for .600 lift.
I also have purchased a stock Aluminum Intake from an SRT.

Looking at Howards cam # 786155-14???
Comps cam 112-500-11????
either way Use Comp Lifters 856-16?
Also looking at a set of full length Headers for an SRT8 Jeep Grand Cherokee as they dont make headers for the Jeep Commander.

I have NEVER built a Hemi before looking for advise ?????


I want a Good Truck engine to go out on Hi ways and Hill climbs 4x4 in the mountains Needs to have loads of Torq and be reliable and run on Pump gas and live for another 150K+ miles. Non supercharged no NOS no Turbos no racing just pulling and 4x4ing

Thoughts? ideas? advise? Many thanks in advance!
Credit cards are burning a hole in my pocket on this one.

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Old 11-02-2020, 07:47 PM   #2
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Welcome Dennis to HTC.. If you are not building an all out race motor I'd just sleeve the bad hole and install the 5.7/392 stroker kit.. keeping it all simple.. I have a new 6.1 block stroker with a 4.050" stroker crank and ee had to remove the oilers..
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Old 11-02-2020, 10:08 PM   #3
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Well I know you won’t be able to bore it to a 6.1 diameter way to thin wall at that point. I do however know that a sleeve will hold up. My 5.7 was bored .020 over and 4.050 stroker making it a 6.4 and I dropped a valve and had to sleep it. My engine is boosted and has been from day one holds great so an NA setup will be even better off. I run Callie’s compstar and diamond pistons is mine have over 100k on engine.
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Old 11-03-2020, 02:12 AM   #4
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Old 11-03-2020, 11:15 AM   #5
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Old 11-03-2020, 04:02 PM   #6
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Quote:
Originally Posted by Redtruck-VA View Post
Welcome Dennis to HTC.. If you are not building an all out race motor I'd just sleeve the bad hole and install the 5.7/392 stroker kit.. keeping it all simple.. I have a new 6.1 block stroker with a 4.050" stroker crank and ee had to remove the oilers..

I want to take advantage of the Eagle heads raised compression by the smaller combustion chamber and The Aluminum intake and Cam with a set of full length headers with a tune.

i would sure hate to spend all that money and leave something I could have done with the engine tore down to make more power?

No its not a Race truck never will be! But I want to pull a load (my CJ7) and be able to climb hills while towing.
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Old 11-03-2020, 04:03 PM   #7
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Put the Hemi in the HEMI you know?
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Old 11-04-2020, 08:41 AM   #8
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Compression is as you stated chamber size and piston choice. The eagle heads flow well allowing a .600" range cam to breath. Quality parts will insure your money is well spent. Back in the 70's I use to play in Death Valley on the dunes. As for cooling its all about big radiators and fans.. anyway my 2 cents..
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Old 11-04-2020, 09:48 AM   #9
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Quote:
Originally Posted by Redtruck-VA View Post
Compression is as you stated chamber size and piston choice. The eagle heads flow well allowing a .600" range cam to breath. Quality parts will insure your money is well spent. Back in the 70's I use to play in Death Valley on the dunes. As for cooling its all about big radiators and fans.. anyway my 2 cents..
I spoke with My Machinist yesterday He said the Block was Sonic checked at another shop as he does not have that machine, he says he read the report when it came back to his shop and says it would take the Bore. unfortunately His office staff has misplaced the Sonic check report sheet!
They are trying to produce it today for me to read if it cant be found its going to have to go back to his buddy's shop to be re performed or I am not paying for it!

I am also not against your advise of just sleeving the one cylinder and just doing the 392 stroker kit with the 3.927 bore and 4.050 stroke.
And to be honest with all the BS about this sonic check I am leaning that way. But I really wanted to Bore it big.

I am a Big block guy what can I say? There is no substitute for cubes!
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Old 11-04-2020, 10:10 AM   #10
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The 5.7 stroker (392) has proven itself with more than a few on the forum running boost. If you want 426 range then a 6.1 block is what you want.
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Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

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