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02-04-2015, 04:43 PM
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#1 |
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Gentleman Jim owner x2
 
Join Date: Oct 2010
Location: West Des Moines, IA
Posts: 464
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Internal differences Vortec 5.7 and standard 5.7
What's the difference in an 86-95 1-piece RMS crankshaft and a 96-99 5.7 Vortec crankshaft? Or is there any? How does the crank reluctor for the position sensor attach to the crank?
How about the wrist pins and pistons? I know the cam and lifters are roller block or non-roller block specific. Reason I'm asking is because a spare engine of mine developed a pretty bad knock and I need to know what year ranges I can search for when it comes to parts.
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1975 GMC Gentleman Jim #1 -357 / 700r4 1975 GMC Gentleman Jim #2 -350 / TH350 |
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02-04-2015, 07:05 PM
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#2 |
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driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,763
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Re: Internal differences Vortec 5.7 and standard 5.7
Everything is the same. Reluctor is a ring that slips over the crank snout.
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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02-04-2015, 07:09 PM
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#3 |
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Gentleman Jim owner x2
Join Date: Oct 2010
Location: West Des Moines, IA
Posts: 464
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Re: Internal differences Vortec 5.7 and standard 5.7
Cool, thanks. Now to see if I can actually punch out a vortec 350 about 40 over and see if it still runs right...
__________________
1975 GMC Gentleman Jim #1 -357 / 700r4 1975 GMC Gentleman Jim #2 -350 / TH350 |
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02-05-2015, 07:35 AM
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#4 |
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Registered User
Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,501
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Re: Internal differences Vortec 5.7 and standard 5.7
Guess you never saw this
http://www.chevrolet.com/performance...k+crate+engine There are some that say it will never run right without retuning the PCM. Retailers go both ways. Notice GM says it does NOT need reprogramming. But there is this note at the bottom. "Performance recalibration of engine control unit (ECU) will significantly increase torque and horsepower." Not a problem. PCMForless in NC can reprogram the PCM. They did 2 different PCM's for me. If you do anything to a Vortec if you haven't already done them. These 3 things are a must. Get rid of the OEM plastic distributor. 1) http://www.summitracing.com/parts/su...et/model/k1500 Replace the terrible CSF Injectors with this. 2) http://www.summitracing.com/parts/sm...98/model/k1500 Get rid of the plastic intake gaskets from the factory and use these metal ones. 3) http://www.summitracing.com/parts/fel-ms98000t Last edited by speedygonzales; 02-05-2015 at 07:47 AM. |
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02-05-2015, 08:28 AM
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#5 |
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Gentleman Jim owner x2
Join Date: Oct 2010
Location: West Des Moines, IA
Posts: 464
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Re: Internal differences Vortec 5.7 and standard 5.7
Nope, never saw that. And for some reason I can't find the "search" function anymore on this site, so I figured I would just ask in a thread.
I do plan on doing the MPFI conversion, and I didn't know they made a non-plastic distributor. Thanks for the heads up on those.
__________________
1975 GMC Gentleman Jim #1 -357 / 700r4 1975 GMC Gentleman Jim #2 -350 / TH350 |
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02-05-2015, 02:58 PM
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#6 | |
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driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,763
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Re: Internal differences Vortec 5.7 and standard 5.7
Quote:
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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