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01-21-2020, 11:32 PM | #1 |
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5.7 vortec rebuild ?? will non vortec heads work ?
just picked up a 1996 standard bore 5.7 vortec short block for $80. I didn't get any heads, intake or accessories. I have heads and intake but they are old school heads (882) and intake is high rise aluminum (holley), my question is can I use these heads on this block ? and can I still run the factory roller cam setup ? I know the heads aren't vortecs but they have 202/160, port matched/polished, de-shrouded, screw in studs and guide plates, my pistons have small dome to compensate for the 76 cc chambers. and I'd like to use them if I can and run the factory roller cam. first time to build a roller block. thanks for answering my dumb question.
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01-22-2020, 11:08 AM | #2 |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
I don't know why it would not work, since you can go the other way and intall vortec heads on an earlier block
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01-22-2020, 11:40 AM | #3 |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
They should work but I would worry about spark knock( detonation). Probably would get some really poor gas mileage also. My cousin has the same set up, using one of his dad's old race engines in a S10. He mixes race fuel 50/50 with pump gas.
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01-22-2020, 10:11 PM | #4 |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
The '96-'02 L30 & L31 engines are still a GEN I small block, just with some upgrades. Yes you can run your 882's on that '96 block and yes you can run a factory roller cam. You will just need the correct length pushhrods. The factory L31 cam is a bit on the small side
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01-23-2020, 10:59 AM | #5 | |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
Quote:
Last edited by garyd1961; 01-23-2020 at 11:14 AM. |
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01-23-2020, 12:54 PM | #6 | |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
Quote:
Op- you can run any gen I small block head you want on that block. Not sure what garyd1961 is going on about with poor gas mileage and detonation. You said you'll match the pistons to the heads. 9:1 is 9:1 regardless of how you get there [or whatever compression you choose]
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01-23-2020, 02:10 PM | #7 |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
How many motor builders today use domed pistons? They were the thing back when we had leaded gas but not today. Sure you can make it work but flat top pistons with modern heads like vortecs will work a lot better.
The old 350 cam had like 396/401 lift and the L31 cam has 414/428 lift plus it's a roller which opens the valves faster than the old flat tappet cam. |
01-23-2020, 10:14 PM | #8 | |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
The small domed pistons that the op said he was going to use with those 76cc chambered heads is going to be about 9:1 or maybe 9.5:1 at the most. If you are going to use heads with 64cc chambers as the Vortec heads do, then yes a flat top piston is a good choice for pump gas.
Quote:
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01-24-2020, 08:58 AM | #9 |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
There more to it than just compression ratios.
Personally I would trash the 882s and get a set of vortecs. You can can make them work but in the end you would be better off with the vortecs. Last edited by garyd1961; 01-24-2020 at 09:57 AM. |
01-24-2020, 01:10 PM | #10 |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
The question for me wouldn't be compression ratio, as that can be manipulated by changing several factors. The question is flow. I know the OP has a lot of work into those heads; how would they flow as compared to Vortec heads?
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01-24-2020, 01:14 PM | #11 |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
It will all bolt together and run just fine as-is. Could it be better........yes. Will it run fine with 882 heads and the stock cam.........yes.
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01-24-2020, 01:34 PM | #12 |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
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01-25-2020, 07:10 PM | #13 | |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
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86 Silverado (short) 350 (basically a L82 from 74 z/28), turbo 350 (lockup), 273 gears (going 308 or 342 after build). |
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01-27-2020, 05:05 PM | #14 |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
The 882s are prone to cracking right between the two center exhaust valves. I had a set with one cracked in that spot. With flat top pistons you can easily upgrade to better heads later. Just something to think about.
Last edited by garyd1961; 01-27-2020 at 08:06 PM. |
01-27-2020, 08:48 PM | #15 | |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
Quote:
As for the pistons, yes I get domed pistons don't propagate the flame front as efficiantly as a flat top or dished piston, but at a 9:1 ratio or so it won't be too big a deal. Besides, after seeing inside some European engines lately like the 5.0 from jag/land rover or the 3.0 from Audi, Im really starting to wonder how much faith to put into flame fronts and all that jazz.
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01-27-2020, 09:02 PM | #16 | |
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Re: 5.7 vortec rebuild ?? will non vortec heads work ?
Iui
Quote:
The L31 cam makes a lot of torque. Last edited by garyd1961; 01-27-2020 at 09:27 PM. |
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