Vortec 5700 L31 installed in a 3rd gen?? I ran across a very low mileage (20K) Vortec longblock from a 99 GMC truck for pretty cheap. I've thought about putting Vortec heads and the Vortec TPI intake on my 91 GTA 350 L98 block. My question is what issues would I have to deal with installing the Vortec longblock in my car with the TPI intake? Thx. in advance for any help. |
The only issue would be the Vortec TPI base. You should be good to go. Why not just install the longblock? You could swap over your L98 cam if you like, or get something aftermarket. |
Re: Vortec 5700 L31 installed in a 3rd gen?? I was doing a little research and there might be a water pump reverse flow issue if I want to use a 88-92 Serpentine setup. |
The serpentine water pump is reverse rotation. Neither L98 nor Vortec are reverse flow. |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by five7kid
(Post 3809616)
The serpentine water pump is reverse rotation. Neither L98 nor Vortec are reverse flow. Will the 88-92(f-body) Serpentine setup and water pump work on the Vortec 5700 L31? |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Dokken10
(Post 3810019)
The 88-92(f-body)Serpentine setups have a reverse flow water pump? The L98 and Vortec are not reverse flow? I'm confused? Will the 88-92(f-body) Serpentine setup and water pump work on the Vortec 5700 L31? You should remove all the truck accessories anyway and bolt all your f-body stuff to it. I doubt the truck stuff will even fit in the car. I dont know about the reverse flow or not waterpump issue, but if you just throw the water pump off hte L98 on there with the rest of the serpentine system you wont have any problems. They may well be the same, though. SOme water pumps have the pulley lined up in a different spot (Farther out in front the motor or closer to the motor) and so if you're going to move the serpentine system over, jsut get a water pump to match - problem solved. :) |
Re: Vortec 5700 L31 installed in a 3rd gen?? Summit calls out a reverse flow WP for a 88-92 5.0 and 5.7 in Camaros and Firebirds. 96-2000 5700 Vortec 5.7 call for a standard flow WP. Here is the problem I see: You cannot use a standard rotation WP with a 88-92 Serpentine setup because to get all the other acc. to work they must turn the right direction and to do that you would be turning a standard WP the wrong direction. The 88-92 Serpentine bolts right up to a Vortec engine. What would happen if you installed a reverse flow WP on a engine that did not come from GM with a reverse flow WP? |
Re: Vortec 5700 L31 installed in a 3rd gen?? Most GM Serpentine setups will not work in 3rd gen F-bodies because of hood clearance issues, especially truck setups. |
Re: Vortec 5700 L31 installed in a 3rd gen?? The only reverse flow engines are the LT1 type. Reverse rotation is different and for use with serpentine setups. You should have no problem using whats on your camaro right now. |
Take everything you read on summitracing.com with a grain of salt. Love 'em to death, but they get a lot of things wrong. As stated, LT1 was the only, ever reverse "flow" engine. The water pump also happened to be driven by the cam. Serpentine car and truck systems use a water pump that rotates in the opposite direction as the engine, and are therefore called reverse "rotation" water pumps - the flow direction is the same as always. L98 (after '88), L31, LB9 (after '88), LO3, LO5, all those engines with serpentine systems, were standard flow (block first) and reverse rotation water pumps. |
Re: Vortec 5700 L31 installed in a 3rd gen?? So the coolant runs thru the engine the same(besides the LT1 type)its just the acc. belt turning the WP pulley the opposite direction when they state reverse rotation-flow WP? |
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? |
Re: Vortec 5700 L31 installed in a 3rd gen?? I have a 99 GMC K1500 Z71(old body style)with the L31. I'm going to check this issue I have out tomorrow. Thx. for all the input. |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Dokken10
(Post 3810376)
So the coolant runs thru the engine the same(besides the LT1 type)its just the acc. belt turning the WP pulley the opposite direction when they state reverse rotation-flow WP? |
Re: Vortec 5700 L31 installed in a 3rd gen?? five7kid, I totally agree with you about summitracing.com. I have found so many errors especially when it comes to years applicable and got errors-bad advice from the employees at the store-warehouse here in Atlanta. ---------- It took me awhile but I'm finally getting it. I guess I have burnt to many brain cells in my life with that wacky weed. LOL |
Re: Vortec 5700 L31 installed in a 3rd gen?? Another question: Can I use the L98 TPI cam in my 91 engine and install it the L31 without changing the lifter and pushrods? Are the lifters and pushrods the same in the L98 and the L31? |
Yes, you can use the L98 cam in the L31 engine. See Post #2. Lifters and pushrods are the same. |
Re: Vortec 5700 L31 installed in a 3rd gen?? Looks like I'm gong to buy the engine since it seems I won't have any issues. Do these roller cams and lifters wear out? I have heard they last a longtime with very little wear. |
Re: Vortec 5700 L31 installed in a 3rd gen?? the stock l31 cam is better i think |
Re: Vortec 5700 L31 installed in a 3rd gen?? I got the specs on the stock 90-92 L98 cam but not for the L31 cam. |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Dokken10
(Post 3811421)
I got the specs on the stock 90-92 L98 cam but not for the L31 cam. |
Re: Vortec 5700 L31 installed in a 3rd gen?? GM Stock Cams Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes 14093643 202/207 .404/.415 .431/.443 114.5 87 350,305man 10088155 179/194 .350/.384 .373/.410 109deg 87 305 auto 10066049 207/213 .415/.430 .443/.459 117deg 88-89 350,305 10111773 202/207 .413/.428 .441/.457 114.5 90-92 350,305 I'm weak on cam specs but it looks like the 90-92 to be a better cam. This cam chart is from TGO. https://www.thirdgen.org/mods3 |
Re: Vortec 5700 L31 installed in a 3rd gen?? well u know the stock cam works well in the l31. question is are u going to use tpi on it still? |
Re: Vortec 5700 L31 installed in a 3rd gen?? The L31 is just a longblock No intake. I'm going to use a Edelbrock or Dickey Vortec TPI base with all the other SD TPI parts. |
Re: Vortec 5700 L31 installed in a 3rd gen?? If I install the L98 cam I believe I won't have to do as much prom re-programming. |
Re: Vortec 5700 L31 installed in a 3rd gen?? Vortec heads flow like crazy compared to L98 heads SD setups are rather particular on mods You will need a tune for the longblock swap Why not pick a decent cam while you're at it? |
Re: Vortec 5700 L31 installed in a 3rd gen?? I'm not looking to increase HP and Torque too much over stock. I want to stick with a roller cam and lifters. Roller cams are $300 plus ---------- I'm not looking to build a straight line car also. |
Re: Vortec 5700 L31 installed in a 3rd gen?? how much are you spending on the l31 |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by jamon8
(Post 3811750)
how much are you spending on the l31 |
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 |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Stephen
(Post 3811761)
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 Are the cam specs the same in L31 in trucks from 96-2000? |
Re: Vortec 5700 L31 installed in a 3rd gen?? This engine is also coming out of a 2500 so it should be a 4-bolt main. From the research I've done. |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Dokken10
(Post 3811769)
This engine is also coming out of a 2500 so it should be a 4-bolt main. From the research I've done. As for cam specs over the years, I don't know the specific specs through the years, but I would suspect there was some improvement through the years. Are you going to use the Vortec distributor or the TPI one? |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Pocket
(Post 3811717)
Vortec heads flow like crazy compared to L98 heads SD setups are rather particular on mods You will need a tune for the longblock swap Why not pick a decent cam while you're at it? |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Stephen
(Post 3811782)
Yes...1500=2-bolt main 2500/3500=4-bolt main As for cam specs over the years, I don't know the specific specs through the years, but I would suspect there was some improvement through the years. Are you going to use the Vortec distributor or the TPI one? |
Re: Vortec 5700 L31 installed in a 3rd gen?? I've only been able to find specs on the 96 L31 cam ---------- I do know from my 99 GMC with the L31 that the distributors don't last, head and intake gaskets leak. These are common problems with the L31 |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Dokken10
(Post 3811788)
Probably the TPI distributor. Why? As for the wiring differences, as in...can the TPI harness simply plug into a Vortec dizzy, I dunno. If so, the injector harness plug would simply be left emtpy. There would have to be a plug from the Vortec dizzy to the ECM to tell it which injector to fire when, then the ECM would have another harness piece to the injectors themselves. Make sense? In my head I can see it all, but I'm not sure I'm explaining it right. Am I? Hope so. |
Re: Vortec 5700 L31 installed in a 3rd gen?? Once the TPI is altogether and the plenum extension is on you can't really see the distributor. Doesn't the Cam PS work with the Crank PS or is that just in the ECM? I had a code in my truck that was P1345 = Crankshaft position sensor / Camshaft position sensor correlation. It should say your crappy GM distributor is wasted. I'm going to stick with the TPI distributor and make life easier. |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Dokken10
(Post 3811925)
Once the TPI is altogether and the plenum extension is on you can't really see the distributor. Doesn't the Cam PS work with the Crank PS or is that just in the ECM? I had a code in my truck that was P1345 = Crankshaft position sensor / Camshaft position sensor correlation. It should say your crappy GM distributor is wasted. I'm going to stick with the TPI distributor and make life easier. |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by intex1982
(Post 3812020)
why dont u just use a carb? dont the 2500/3500 come with 062 heads? 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 |
Re: Vortec 5700 L31 installed in a 3rd gen?? Mortec info on the block: 10243880...350...95-00...2 or 4...Vortec truck, Gen.I crate motors and "ZZ4", roller cam, one piece rear seal They have 95-00 but I believe it should be 96-00 |
Re: Vortec 5700 L31 installed in a 3rd gen?? well i am to but not when its not stock anyway. i just think its alot of trouble |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Dokken10
(Post 3811786)
Also a decent roller cam is $300 plus |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by urbanhunter44
(Post 3812057)
You can get them way cheaper than that.. near $150 usually. $300 - $400 would get you an okay custom grind. |
With roller, new isn't really an issue. You can get an LT1 or ZZ4 take-out cam for $150 or less. |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by five7kid
(Post 3812177)
With roller, new isn't really an issue. You can get an LT1 or ZZ4 take-out cam for $150 or less. |
Re: Vortec 5700 L31 installed in a 3rd gen?? I found this cam on Ebay: P/N 10185071 DESCRIPTION: CAMSHAFT Hydraulic Roller Tappet This hydraulic roller tappet is used on the 5.7-liter H.O. 350 ZZ3 & 4 engines. The duration at lash point in degrees (intake/exhaust) is 275/280; duration at .050" tappet lift (intake/exhaust) is 208/221; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 474/501. Valve lash is zero/zero and lobe centerline is 112 degrees. |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Dokken10
(Post 3812220)
I found this cam on Ebay: P/N 10185071 DESCRIPTION: CAMSHAFT Hydraulic Roller Tappet This hydraulic roller tappet is used on the 5.7-liter H.O. 350 ZZ3 & 4 engines. The duration at lash point in degrees (intake/exhaust) is 275/280; duration at .050" tappet lift (intake/exhaust) is 208/221; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 474/501. Valve lash is zero/zero and lobe centerline is 112 degrees. |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by Dokken10
(Post 3811925)
Once the TPI is altogether and the plenum extension is on you can't really see the distributor. Doesn't the Cam PS work with the Crank PS or is that just in the ECM? That, I have no idea. But, I'd suspect the ECM looks at both & adjusts timing, based on if both are reading as synced, then throws a code/adjusts the timing as needed, to try to keep them together. ----------
Originally Posted by Dokken10
(Post 3811925)
Once the TPI is altogether and the plenum extension is on you can't really see the distributor. Doesn't the Cam PS work with the Crank PS or is that just in the ECM? I had a code in my truck that was P1345 = Crankshaft position sensor / Camshaft position sensor correlation. It should say your crappy GM distributor is wasted. I'm going to stick with the TPI distributor and make life easier. |
Re: Vortec 5700 L31 installed in a 3rd gen??
Originally Posted by intex1982
(Post 3812020)
why dont u just use a carb? dont the 2500/3500 come with 062 heads? Besides, you can make more power AND get better mileage with EFI. ----------
Originally Posted by intex1982
(Post 3812261)
u will have to get ur heads worked on to take that big of a cam. |
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