1999 Stock 350 Vortec compression ratio??? - Chevelle Tech
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  #1  
Old May 15th, 09, 12:52 PM
bigbird90650 bigbird90650 is offline
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Default 1999 Stock 350 Vortec compression ratio???

I just picked up a complete 350 vortec engine out of a 99 (old body style) Escalade. It is the same engine as the chevy trucks, tahoes and suburbans had in them from 96-99. The engine looks good inside so I'm just going to run it as is except for a cam upgrade. I'm just wondering what the compression ratio is on this engine? Thanks.
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1998 Chevy Z71 Full Size Pick-up Vortec 350

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  #2  
Old May 15th, 09, 1:00 PM
BowtieAaron BowtieAaron is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

9.4:1 i believe.
swap a cam into it, with upgraded springs and cut the valvr seat guide area down, and have a blast.


aaron
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71 chevelle
355 10.3:1cr, brodix ik180 heads, voodoo hyd roller, holley efi intake, eMS-PRO, 60lbs dekas, ls tb, 700r4, 3.55 gears
Soon to be 7875 turbocharged!
368rwhp 383rwtq n/a with carb
12.23 @ 110 1.68 60ft
Dyno video NA
http://youtu.be/PvZ7tDVyryw
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  #3  
Old May 15th, 09, 1:13 PM
bigbird90650 bigbird90650 is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

Quote:
Originally Posted by BowtieAaron View Post
9.4:1 i believe.
swap a cam into it, with upgraded springs and cut the valvr seat guide area down, and have a blast.


aaron
I have a set of Vortec heads that have machined guides already, 202 valves, oversized springs and screw-in studs and guideplates all ready to be slapped on this engine. The stock heads that came on the motor had some hairline cracks between the valves so I trashed them. I was just wondering if I should have the heads surface machined down a little in increase the CR. What do you think? We only have 91 octane out here in California.
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1998 Chevy Z71 Full Size Pick-up Vortec 350

1998 Buick Regal GS Supercharged V6. Smaller SC pulley, SLP cold air box, TB spacer

68 El Camino 350, B&M TH350, 12 bolt posi 3.73's. SOLD
71 El Camino 350/350
SOLD
70 El Camino 350, Vortec heads, Lunati 60103 cam. SOLD
69 El Camino parts car. SOLD

Jesus is my Lord. God Bless.
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  #4  
Old May 15th, 09, 1:51 PM
pdq67 pdq67 is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

Maybe a .005" cut and then install .015" or .020" thick shim headgaskets.

pdq67
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  #5  
Old May 15th, 09, 2:14 PM
bochnak bochnak is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

Quote:
Originally Posted by BowtieAaron View Post
9.4:1 i believe.
Yup,

Scroll way to the bottom:

http://autos.msn.com/research/vip/sp...model=Escalade
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  #6  
Old May 15th, 09, 3:08 PM
BowtieAaron BowtieAaron is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

thats all i run is pump gas.. i had 62cc '461 camel humps with stock 4valve pistons, probably somewhere about 9.8:1, maybe a little more. ran good. no ping.

i run just about 10:1 with aluminum heads and 38* timing with a large cam, and no ping.
my stock lt1 trans am has 10.4:1cr and alum heads, and only has slightest bit of ping when hot with stock crappy tune.


aaron
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71 chevelle
355 10.3:1cr, brodix ik180 heads, voodoo hyd roller, holley efi intake, eMS-PRO, 60lbs dekas, ls tb, 700r4, 3.55 gears
Soon to be 7875 turbocharged!
368rwhp 383rwtq n/a with carb
12.23 @ 110 1.68 60ft
Dyno video NA
http://youtu.be/PvZ7tDVyryw
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  #7  
Old May 15th, 09, 4:27 PM
Bowtie-72 Bowtie-72 is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

I did the same thing as you. I left the short block as-is from GM, had only 19K on it.
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  #8  
Old May 15th, 09, 7:14 PM
300hp 300hp is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

i did the same thing. i have a lunati voodoo hyd roller, threw on shim gaskets, should be around 9.6:1
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  #9  
Old May 15th, 09, 9:54 PM
BillK BillK is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

Brian,
Dont know what you are putting it in, but the one in my 99 Tahoe runs so good, I dont know if I would even do a cam change. It will spin right up to 5500 rpm and really pulls that 5000 lb brick around pretty good. It should haul arz in a 3600 lb car. And ... it got 21 mpg on a trip to Florida last December, probably averaging 75mph.

Its a shame you cant keep the fuel injection with it, I am pretty sure it is responsible for the awsome power and the fuel mileage.
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  #10  
Old May 16th, 09, 10:16 AM
bochnak bochnak is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

Is this motor a factory roller?
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  #11  
Old May 16th, 09, 10:22 AM
BowtieAaron BowtieAaron is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

yes. factory roller.
made from 1996 to 2000.
1 pc rear seal
and has a hole for a mechanical fuel pump.

aaron
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71 chevelle
355 10.3:1cr, brodix ik180 heads, voodoo hyd roller, holley efi intake, eMS-PRO, 60lbs dekas, ls tb, 700r4, 3.55 gears
Soon to be 7875 turbocharged!
368rwhp 383rwtq n/a with carb
12.23 @ 110 1.68 60ft
Dyno video NA
http://youtu.be/PvZ7tDVyryw
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  #12  
Old May 16th, 09, 10:27 AM
Busted Knuckles Busted Knuckles is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

I rebuilt the one in my Tahoe with Speed Pro hyper flat tops, compression is right at 10:1, maybe a tad higher since I zero decked the block. I run the lowest octane pump gas with no problem, plenty of power and just short of 20mpg. The computer helps, but so does the fast burn chamber of the vortec heads.
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  #13  
Old May 16th, 09, 12:12 PM
BowtieAaron BowtieAaron is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

i also have speedpro hyper 4 valve flat tops. they are really close to the factory pistons, with zero deck and 64cc heads they claim 9.8:1cr, i think the part number is 345cp or something like that, i cant remember.

my dad had a 96 tahoe with the same motor, and it moved pretty good in that thing.
i have a 94 trans am with an lt1 in it. it is basically the same motor but reverse flow cooling and aluminum angle plug heads. the caprice lt1's had iron heads, and that is where gm based their vortec heads off of. my ta is rated at 275hp 325ftlbs and it runs damn good for a 3500lb automatic car. of course i have exhaust and some other bolt on/free mods, but 300fwhp is very fun.

aaron
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71 chevelle
355 10.3:1cr, brodix ik180 heads, voodoo hyd roller, holley efi intake, eMS-PRO, 60lbs dekas, ls tb, 700r4, 3.55 gears
Soon to be 7875 turbocharged!
368rwhp 383rwtq n/a with carb
12.23 @ 110 1.68 60ft
Dyno video NA
http://youtu.be/PvZ7tDVyryw
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  #14  
Old May 16th, 09, 7:59 PM
bochnak bochnak is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

Quote:
Originally Posted by BowtieAaron View Post
and has a hole for a mechanical fuel pump.

aaron
Explain further. I though since it was EFI, the block was cast "shut", or with no mechanical pump provision. Or a block off plate?

So you can run a mechanical pump on these motors with no mods?
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  #15  
Old May 17th, 09, 10:10 AM
BowtieAaron BowtieAaron is offline
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Default Re: 1999 Stock 350 Vortec compression ratio???

i thought they were shut also.
i know for sure the 87+ truck motors are shut.

mine had a block off plate, but a hole for the pushrod.
i am running a 130gph holley fuel pump (mechanical) on my 880 block (vortec block).

no mods were done to it.

hope you can make out the hole in there...









aaron
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71 chevelle
355 10.3:1cr, brodix ik180 heads, voodoo hyd roller, holley efi intake, eMS-PRO, 60lbs dekas, ls tb, 700r4, 3.55 gears
Soon to be 7875 turbocharged!
368rwhp 383rwtq n/a with carb
12.23 @ 110 1.68 60ft
Dyno video NA
http://youtu.be/PvZ7tDVyryw
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