Vortec 5700 L31 installed in a 3rd gen??
#51
Senior Member
Thread Starter
iTrader: (18)
Join Date: Aug 2005
Location: Brunswick, Ga.
Posts: 847
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Vortec 5700 L31 installed in a 3rd gen??
And the TPI looks so damn cool.
Any P/Ns for a LTI cam or the ZZ4 cam that would be and improvement without head work and killing gas mileage?
Any P/Ns for a LTI cam or the ZZ4 cam that would be and improvement without head work and killing gas mileage?
#52
Senior Member
Thread Starter
iTrader: (18)
Join Date: Aug 2005
Location: Brunswick, Ga.
Posts: 847
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Vortec 5700 L31 installed in a 3rd gen??
Hydrogen has been proven to work with carbs with no problems but FI has not. So you could get the fuel economy with the Hydrogen generator and a carb.
#53
Senior Member
iTrader: (2)
Join Date: Feb 2007
Location: anderson ,sc
Posts: 805
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 formula/00 z28
Engine: carbed 350/ls1
Transmission: 700r4/ a4
Axle/Gears: 3.23 posi/ 3.73 posi
Re: Vortec 5700 L31 installed in a 3rd gen??
And with a carb, there goes anything resembling gas mileage. Something to consider with todays gas prices.
Besides, you can make more power AND get better mileage with EFI.
----------
Yep. .490 is the max you run on a stock Vortec head. But it's fairly easy (for a machine shop) to up the lift capability.
Besides, you can make more power AND get better mileage with EFI.
----------
Yep. .490 is the max you run on a stock Vortec head. But it's fairly easy (for a machine shop) to up the lift capability.
#55
Senior Member
Thread Starter
iTrader: (18)
Join Date: Aug 2005
Location: Brunswick, Ga.
Posts: 847
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Vortec 5700 L31 installed in a 3rd gen??
I'm big fan of TPI intakes and not carbs.
This one has 906 heads.
According to Mortec the 062 were on 98.
12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5, 170cc intake port
10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber,
170cc intake port, 1.94"/1.5" valves
What is the difference between the 062 and the 906? They look the same to me
This one has 906 heads.
According to Mortec the 062 were on 98.
12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5, 170cc intake port
10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber,
170cc intake port, 1.94"/1.5" valves
What is the difference between the 062 and the 906? They look the same to me
#56
Re: Vortec 5700 L31 installed in a 3rd gen??
The differences are quite hazy. The concensus is that the 906 heads have a hardened exhaust seat that appears to have a 1 angle valve job done on it that hinders flow. Thus the 906 heads have a slight stigma about them. In practice, I think you should get a valve job done on used heads anyway and the problem is easily rectified.
Here's a shot of my old junk 906 heads that DANS87GTA RIPPED ME OFF with where you can see the hardened exhaust valve seat:
Sorry, Im still angry at the punk for ripping me off on them...
Here's a shot of my old junk 906 heads that DANS87GTA RIPPED ME OFF with where you can see the hardened exhaust valve seat:
Sorry, Im still angry at the punk for ripping me off on them...
#57
Senior Member
Thread Starter
iTrader: (18)
Join Date: Aug 2005
Location: Brunswick, Ga.
Posts: 847
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Vortec 5700 L31 installed in a 3rd gen??
062 didn't have hardened exhaust seat but a 3 angle valve job?
----------
How did that happen to your heads?
----------
How did that happen to your heads?
Last edited by Dokken10; 07-05-2008 at 01:47 AM. Reason: Automerged Doublepost
#58
Banned
iTrader: (12)
Join Date: Jul 1999
Location: Bertram (outside Austin), TX
Posts: 12,212
Likes: 0
Received 10 Likes
on
10 Posts
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: Vortec 5700 L31 installed in a 3rd gen??
LT1s still use a dizzy-type shaft as an oil pump drive...Right? So I think a LT1 cam would swap right in, no problem. At least, I've never heard of anyone having to get a gear pressed onto the LT1 cams. Just the issue of the nose pin being different, for the Opticrap, which is easily swapped out for the right pin.
#59
Senior Member
Thread Starter
iTrader: (18)
Join Date: Aug 2005
Location: Brunswick, Ga.
Posts: 847
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Vortec 5700 L31 installed in a 3rd gen??
I'm just going to stick with the L31 cam or the 90-92 L98 cam.
#60
Re: Vortec 5700 L31 installed in a 3rd gen??
But either way, it's a bit OT so I'll let your thead continue.
#61
Member
Join Date: Dec 2001
Location: Concordia, MO, USA
Posts: 456
Likes: 0
Received 4 Likes
on
4 Posts
Car: 89 Formula, WS6
Engine: LB9/peanut cam :(
Transmission: 700R4
Re: Vortec 5700 L31 installed in a 3rd gen??
Ok, I just checked Autozone and Advance and they are stating the same thing as Summit did. 88-92 Camaros and Firebirds use a reverse rotation WP and 96-2000 Vortec V8 use a standard rotation WP.
Is this because of the different Acc.-Serp setups on 88-92 Camaros and Firebirds compared to a 96-2000 truck setups?
Is this because of the different Acc.-Serp setups on 88-92 Camaros and Firebirds compared to a 96-2000 truck setups?
The "reverse-rotation" is because of the serpentine belt system. Think about it for a second. Which pulleys on a serpentine system drive off the backside of the belt? The water pump, the tensioner pulley, and idler pulleys, are the ones driving on the backside of the belt on most serps. The easy way to remember it, is the belt wraps around the pulley in the opposite direction to drive of the back. Thus the pulley spins in the opposite direction.
It is not easily possible to mix them up. The pulley mount holes are drilled/tapped differently. Don't ask how I know that. It's one of those things one is embarassed to have done.
#62
Senior Member
Thread Starter
iTrader: (18)
Join Date: Aug 2005
Location: Brunswick, Ga.
Posts: 847
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Vortec 5700 L31 installed in a 3rd gen??
I finally got it earlier, it was Advance, Autozone and Summit that confused me because of their descriptions of the WPs.
#63
Re: Vortec 5700 L31 installed in a 3rd gen??
L31 cam specs are not THAT far off the 92 TPI specs, but theheads themselves flow WAY better...plus the seqential firing order of the inectors equals better mpg. If you use the L31 ECM, distributor & wiring.
96 L31 Camshaft Profile
Intake: .275 X 1.5 = .412
Exhaust: .281 X 1.5 = .423
Lobe Separation 111 Degrees
96 L31 Camshaft Profile
Intake: .275 X 1.5 = .412
Exhaust: .281 X 1.5 = .423
Lobe Separation 111 Degrees
Last edited by InfernalVortex; 07-06-2008 at 02:53 AM.
#65
Senior Member
Join Date: Oct 2005
Location: Brooklyn, NY 11208
Posts: 593
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1983 Recaro T/A
Engine: L69
Transmission: MM5
Axle/Gears: 3:73
Re: Vortec 5700 L31 installed in a 3rd gen??
SUBSCRIBED! Thanks, been looking for a thread like this. My Camaro needs a valve job. And I have a Vortec 5.7 out of a 99 Express laying around that I wanna convert to TPI and drop it right in.
#66
Senior Member
Thread Starter
iTrader: (18)
Join Date: Aug 2005
Location: Brunswick, Ga.
Posts: 847
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Vortec 5700 L31 installed in a 3rd gen??
I have heard the the Vortec heads are prone to cracking, if so where are the cracking at?
I believe I read some where on a aftermarket Vortec head manufactures website that the beefed up the area where the GM Vortec heads were cracking.
I believe I read some where on a aftermarket Vortec head manufactures website that the beefed up the area where the GM Vortec heads were cracking.
#68
Supreme Member
iTrader: (3)
Join Date: May 2005
Location: Southern IL
Posts: 1,942
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 GTA "Cocaine"
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: Vortec 5700 L31 installed in a 3rd gen??
tally what you spend and I will smoke you with a first gen block
170cc 64combustion cambers
why are these heads worth a ton
I would get some run of the mill 081 a carbide bit and some paper rolls and kill those heads
170cc 64combustion cambers
why are these heads worth a ton
I would get some run of the mill 081 a carbide bit and some paper rolls and kill those heads
#69
Supreme Member
Join Date: Oct 2006
Posts: 1,974
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 RS
Engine: 350 vortec
Transmission: T-5
Axle/Gears: not the best not the worst
Re: Vortec 5700 L31 installed in a 3rd gen??
yeah you spend your time porting the **** out of those 081 heads and he can bolt up his vortecs and put down the same if not more without touching the heads... and if he decideds to clean them up a bit even better... there is a reason they say the vortec head is the best gen1 production head ever...
oh yeah try and find a difference in a "vortec block" and a gen I block
oh yeah try and find a difference in a "vortec block" and a gen I block
#70
Senior Member
Thread Starter
iTrader: (18)
Join Date: Aug 2005
Location: Brunswick, Ga.
Posts: 847
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Vortec 5700 L31 installed in a 3rd gen??
I just got a recommendation to use a stock LT4 cam(not the LT4 HOT cam) in this L31. I know about the Memcal being programmed.
What would I gain from the stock LT4 cam compared to the 90-92 stock L98 cam or the cam in the L31?
FYI, I'm sticking with the 90-92 SD TPI setup with the Vortec TPI base.
Specs on the stock LT4 cam
INTAKE: DURATION/LIFT
@0.05 191 .418
EXHAUST: DURATION/LIFT
@0.05 196 .430
LOBE SEPARATION 111
90-92 stock TPI cam:
10111773 202/207 .413/.428 .441/.457 114.5 90-92 350,305
What would I gain from the stock LT4 cam compared to the 90-92 stock L98 cam or the cam in the L31?
FYI, I'm sticking with the 90-92 SD TPI setup with the Vortec TPI base.
Specs on the stock LT4 cam
INTAKE: DURATION/LIFT
@0.05 191 .418
EXHAUST: DURATION/LIFT
@0.05 196 .430
LOBE SEPARATION 111
90-92 stock TPI cam:
10111773 202/207 .413/.428 .441/.457 114.5 90-92 350,305
Last edited by Dokken10; 07-08-2008 at 07:44 PM.
#71
Supreme Member
iTrader: (2)
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,121
Received 428 Likes
on
368 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Vortec 5700 L31 installed in a 3rd gen??
I just got a recommendation to use a stock LT4 cam(not the LT4 HOT cam) in this L31. I know about the Memcal being programmed.
What would I gain from the stock LT4 cam compared to the 90-92 stock L98 cam or the cam in the L31?
FYI, I'm sticking with the 90-92 SD TPI setup with the Vortec TPI base.
Specs on the stock LT4 cam
INTAKE: DURATION/LIFT
@0.05 191 .418
EXHAUST: DURATION/LIFT
@0.05 196 .430
LOBE SEPARATION 111
90-92 stock TPI cam:
10111773 202/207 .413/.428 .441/.457 114.5 90-92 350,305
What would I gain from the stock LT4 cam compared to the 90-92 stock L98 cam or the cam in the L31?
FYI, I'm sticking with the 90-92 SD TPI setup with the Vortec TPI base.
Specs on the stock LT4 cam
INTAKE: DURATION/LIFT
@0.05 191 .418
EXHAUST: DURATION/LIFT
@0.05 196 .430
LOBE SEPARATION 111
90-92 stock TPI cam:
10111773 202/207 .413/.428 .441/.457 114.5 90-92 350,305
The LT4 cam is an awesome cam upgrade for the L31 Vortec engine. It has more lift, more duration, and a wider LSA. It has more area under the curve as well. It is a very smooth idling camshaft that likes to rev. The LT4 cam fits in with vortec heads very nicely, with LT4 .050" offset retainers, shims, and a good set of valve springs. I have one in my otherwise stock L31 Vortec longblock in my Fullsize G1500 Conversion van. With the 2,000 rpm converter and Tri-Y headers, it came to life all over the powerband. It pulls hard from just off-idle all the way to the 5,600 rpm fuel shut-off on the stock tune.
#72
Senior Member
Thread Starter
iTrader: (18)
Join Date: Aug 2005
Location: Brunswick, Ga.
Posts: 847
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Formula
Engine: 350 L98 SD TPI
Transmission: 700R4
Axle/Gears: 10 bolt PBR 3:23 disc posi
Re: Vortec 5700 L31 installed in a 3rd gen??
The LT4 cam is an awesome cam upgrade for the L31 Vortec engine. It has more lift, more duration, and a wider LSA. It has more area under the curve as well. It is a very smooth idling camshaft that likes to rev. The LT4 cam fits in with vortec heads very nicely, with LT4 .050" offset retainers, shims, and a good set of valve springs. I have one in my otherwise stock L31 Vortec longblock in my Fullsize G1500 Conversion van. With the 2,000 rpm converter and Tri-Y headers, it came to life all over the powerband. It pulls hard from just off-idle all the way to the 5,600 rpm fuel shut-off on the stock tune.
What difference would you see?
Again, I'm weak on cams and the L31 stock cam will not be used.
Last edited by Dokken10; 07-08-2008 at 09:42 PM.
#73
Re: Vortec 5700 L31 installed in a 3rd gen??
Hey everyone. Just registered. Glad to find people that know a little bit about the Votec 350/5700/L31... Whatever you want to call it. I have a 96 L31 in my 77 Camaro.
I'm glad to find out that the cam is a roller cam, that makes it a lot easier to swap it out without having to get a "retro-fit" roller cam.
So I keep hearing that the Vortec heads are awesome and they'll sell really well any everything. I understand that they outflow other OE heads and everything, but why should I keep them over buying a new set of something like Edelbrock E-Tec 170cc heads? Obviously with the E-Tec 200cc heads there's a bigger intake runner which makes it clear why that head would outperform the stock head. But would the 170cc E-Tecs actually outperform the stock heads with the stock cam?
And just how much will the OE Vortec heads go for?
Also, how many horses will the rotating assembly take before having to change that out? It's probably a cast crank and pistons?
Lastly, I read that the max lift on the stock head was like .490. That's just because of the valve stem length right? How far till you reach the piston?
I guess what I don't get is, if I put an E-Tec head on my L31 and the max valve lift is .575 and the cumbustion chambers are still 64cc, There must still be room with the stock head to change out the vavles and springs for a higher lift then, right?
I'm glad to find out that the cam is a roller cam, that makes it a lot easier to swap it out without having to get a "retro-fit" roller cam.
So I keep hearing that the Vortec heads are awesome and they'll sell really well any everything. I understand that they outflow other OE heads and everything, but why should I keep them over buying a new set of something like Edelbrock E-Tec 170cc heads? Obviously with the E-Tec 200cc heads there's a bigger intake runner which makes it clear why that head would outperform the stock head. But would the 170cc E-Tecs actually outperform the stock heads with the stock cam?
And just how much will the OE Vortec heads go for?
Also, how many horses will the rotating assembly take before having to change that out? It's probably a cast crank and pistons?
Lastly, I read that the max lift on the stock head was like .490. That's just because of the valve stem length right? How far till you reach the piston?
I guess what I don't get is, if I put an E-Tec head on my L31 and the max valve lift is .575 and the cumbustion chambers are still 64cc, There must still be room with the stock head to change out the vavles and springs for a higher lift then, right?
#74
Re: Vortec 5700 L31 installed in a 3rd gen??
I understand that they outflow other OE heads and everything, but why should I keep them over buying a new set of something like Edelbrock E-Tec 170cc heads?
Setting cost aside and going aftermarket heads, the usually cant compare without significant porting, and even then a ported aftermarket usually trumps them again
But would the 170cc E-Tecs actually outperform the stock heads with the stock cam?
And just how much will the OE Vortec heads go for?
max lift on the stock head was like .490. That's just because of the valve stem length right?
if I put an E-Tec head on my L31 and the max valve lift is .575 and the cumbustion chambers are still 64cc, There must still be room with the stock head to change out the vavles and springs for a higher lift then, right?
Further reading
http://www.customclassictrucks.com/t...evy/index.html
#75
Banned
iTrader: (12)
Join Date: Jul 1999
Location: Bertram (outside Austin), TX
Posts: 12,212
Likes: 0
Received 10 Likes
on
10 Posts
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: Vortec 5700 L31 installed in a 3rd gen??
There is now a conical spring set available to replace the stock ones. Which like any other spring set.....You can replace the Vortec ones at home, with no more than pulling the rockers off.
Upping the calve lift ability over stock. Simple upgrade.
Or you can buy brand new Vortec heads that already have the spring replacement done for you.
#76
Senior Member
iTrader: (1)
Join Date: Sep 2006
Location: Canada
Posts: 962
Likes: 0
Received 13 Likes
on
10 Posts
Car: 1979 Malibu
Engine: Blown LSx
Transmission: T56 Magnum
Axle/Gears: 9"/wavetrac/35's/3.70
Re: Vortec 5700 L31 installed in a 3rd gen??
just leave the vortec cam in there, it is almost identical, and not really worth the effort to take it apart, the vortec cam is a little better aswell. it will run just fine on the stock prom
Thread
Thread Starter
Forum
Replies
Last Post
1992rs/ss
NW Indiana and South Chicago Suburb
12
05-19-2020 07:02 PM
84z96L31vortec
Tech / General Engine
7
08-20-2017 12:16 AM
Fast355
DFI and ECM
14
12-02-2016 06:33 PM
1992rs/ss
Engine/Drivetrain/Suspension Parts for Sale
16
01-28-2016 09:58 PM
84z96L31vortec
North East Region
1
08-10-2015 08:27 PM