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Username Post: double or single roller timing chain        (Topic#358803)
rain_man_rich 
Contributor
Posts: 149

Loc: Grants Pass, OR
Reg: 02-09-14
11-12-19 08:28 PM - Post#2780085    

Got a sloppy chain. I'll get some exact numbers off it later when I can get someone to watch the rotor for me. Anywho, I get on rockauto and see they sell both single and double sprockets/chains for the same application. Will the doubles clear the timing chain cover? What would be recommended?

1994 K1500 5.7



 
Bad56Sedan 
"13th Year" Gold Supporting Member
Posts: 1171
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
11-13-19 09:40 AM - Post#2780105    
    In response to rain_man_rich

If the 5.7 is all stock and it is a '94, typical every day transportation
I would simply replace with the GM/AC Delco stock chain and gears.
Surely this motor has gotten over 150k or more?
Just use stock parts.
That's what I would do.


VC56S 2 door Sedan, 39 Years



Edited by Bad56Sedan on 11-13-19 09:41 AM. Reason for edit: I did not cover every possibility, oh no!

 
rain_man_rich 
Contributor
Posts: 149

Loc: Grants Pass, OR
Reg: 02-09-14
11-13-19 06:46 PM - Post#2780126    
    In response to Bad56Sedan

Thats what I was leaning towards but I didn't want to provide a preconceived notion so as to get opinions that are not mine. I might add that the doubles are about the same cost.

I can't help but think two is better than 1 though.

Anyone run one of those felpro single oil pan gaskets? Wondering how much hassle one of those would be to install from underneath.



 
1983G20Van 
Super Senior Member
Posts: 3794

Loc: Bedford, Texas, USA
Reg: 11-13-02
11-14-19 11:16 AM - Post#2780148    
    In response to rain_man_rich

My suggestion is a single roller chain. Will bolt directly in place with no grinding.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
YOUNG57 
Frequent Contributor
Posts: 1159

Loc: Tennessee
Reg: 12-06-10
11-14-19 06:14 PM - Post#2780174    
    In response to rain_man_rich

A double roller chain and sprockets are tougher than single. They are direct fit no modification.
The FelPro one-piece oil pan gaskets are easier to install and less likely to leak.




 
1983G20Van 
Super Senior Member
Posts: 3794

Loc: Bedford, Texas, USA
Reg: 11-13-02
11-14-19 06:57 PM - Post#2780184    
    In response to YOUNG57

  • YOUNG57 Said:
A double roller chain and sprockets are tougher than single. They are direct fit no modification.
The FelPro one-piece oil pan gaskets are easier to install and less likely to leak.




That is simply not the case. The sprockets, rollers and chains are built far more substantially on the factory style single rollers. I have had one of those fancy double rollers (Cloyes) in a mild flat tappet application with modest spring pressure stretch to the point of requiring replacement in under 100K. I have run a factory style single roller Cloyes with a much more aggressive roller cam and almost 100 lbs more open spring pressure and the chain was like new at 100K.

Double rollers often require clearance grinding on later factory roller style blocks which a 94 truck is aure to have.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 11-14-19 07:07 PM. Reason for edit: No reason given.

 
1983G20Van 
Super Senior Member
Posts: 3794

Loc: Bedford, Texas, USA
Reg: 11-13-02
11-14-19 07:31 PM - Post#2780189    
    In response to 1983G20Van

If you have it torn down that far and have the tools, pop the valve covers and measure the cam lift for every lobe. The modern oils are not nice to flat tappet cams on higher mileage engines. Would be a good time to replace the cam and lifters if they are wearing.

The one piece oil pan gaskets are a breeze to install. They come with 4 threaded clips that thread into each corner. Thread those into place. Clean the pan rail really well with brake clean and a rag. Put your RTV silicon on the 4 corners where the gasket meets the timing chain and rear main seal housing. Let it get a little tacky. Then slide your pan gasket over the snap up clips. Followed by your oil pan. Then start your bolts in a cris cross outer rotating pattern. Remove your snap ups one your center bolts are in place. Shouldn't leak a drop after. Its also a great time to check the oil pump and replace the driveshaft with one that has a pinned metal collar rather than that atupid plastic collar. I am also know to yank #1 rod and main caps just to look at the bearing conditions when the pan is off. Why #1? Its the first one that gets starved. Its easier and cheaper to address worn bearings before they spin than after. Be sure to pressure wash the underside of the engine and suspension before you tear into the engine so that you keep as much gunk out of the engine as you can.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 11-14-19 07:33 PM. Reason for edit: No reason given.

 
CowboyTrukr 
"8th Year" Silver Supporting Member
Posts: 4298
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
11-14-19 09:31 PM - Post#2780194    
    In response to 1983G20Van

‘94 block is still flat tappet, as is the ‘95.

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
scrambldcj8 
Silver Supporting Member
Posts: 2517
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
11-15-19 04:23 AM - Post#2780203    
    In response to CowboyTrukr

  • CowboyTrukr Said:
‘94 block is still flat tappet, as is the ‘95.



It is (in trucks), but I believe G20 meant roller ready/capable/prepped/set -up. Although, it may or may not have been drilled/tapped for the spider etc. from the factory. He did say "roller style", I agree it may not have been clear.



 
1983G20Van 
Super Senior Member
Posts: 3794

Loc: Bedford, Texas, USA
Reg: 11-13-02
11-15-19 05:33 AM - Post#2780206    
    In response to CowboyTrukr

  • CowboyTrukr Said:
‘94 block is still flat tappet, as is the ‘95.



Not necessarily. GM did aome weird stuff at that point.

My uncle had a 94 that he bought new from a dealership in 94. We discovered in 2004 when we did the intake gaskets that it was factory roller. I have also had a couple of 305 and 350 G-vans apart that were roller as well.

That being said I am talking about the actual block casting. The blocks that were cast roller compatible even if they were not drilled and tapped have the casted area for the cam retainer plate. It is on both outer edges of this casted area that the cam sprocket rubs on a double roller.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 11-15-19 05:34 AM. Reason for edit: No reason given.

 
CowboyTrukr 
"8th Year" Silver Supporting Member
Posts: 4298
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
11-15-19 10:23 AM - Post#2780221    
    In response to 1983G20Van

Clarifying, the GMT400 trucks.

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
1983G20Van 
Super Senior Member
Posts: 3794

Loc: Bedford, Texas, USA
Reg: 11-13-02
11-15-19 02:17 PM - Post#2780235    
    In response to CowboyTrukr

  • CowboyTrukr Said:
Clarifying, the GMT400 trucks.



My uncles 94 GMT400 was a factory roller cam. It was the factory engine that had 250K on it at the time.

Also been into a 1995 Tahoe that was a one owner truck that had the original engine with a factory roller cam in an 880 block.


1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 11-15-19 02:20 PM. Reason for edit: No reason given.

 
scrambldcj8 
Silver Supporting Member
Posts: 2517
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
11-15-19 05:04 PM - Post#2780244    
    In response to 1983G20Van

  • 1983G20Van Said:
  • CowboyTrukr Said:
Clarifying, the GMT400 trucks.



My uncles 94 GMT400 was a factory roller cam. It was the factory engine that had 250K on it at the time.

Also been into a 1995 Tahoe that was a one owner truck that had the original engine with a factory roller cam in an 880 block.




I am sure you checked....what roller cams were used in these rarities? Do you have cam numbers/specs, were they Vortec rollers?



 
1983G20Van 
Super Senior Member
Posts: 3794

Loc: Bedford, Texas, USA
Reg: 11-13-02
11-15-19 07:21 PM - Post#2780260    
    In response to scrambldcj8

  • scrambldcj8 Said:
  • 1983G20Van Said:
  • CowboyTrukr Said:
Clarifying, the GMT400 trucks.



My uncles 94 GMT400 was a factory roller cam. It was the factory engine that had 250K on it at the time.



Also been into a 1995 Tahoe that was a one owner truck that had the original engine with a factory roller cam in an 880 block.




I am sure you checked....what roller cams were used in these rarities? Do you have cam numbers/specs, were they Vortec rollers?



10111773 same as a 9C1 Caprice or Speed Density TPI 305/350.


1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
CowboyTrukr 
"8th Year" Silver Supporting Member
Posts: 4298
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
11-15-19 09:30 PM - Post#2780267    
    In response to 1983G20Van

Thanks for enlightening me. Learn new stuff all the time here.

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
rain_man_rich 
Contributor
Posts: 149

Loc: Grants Pass, OR
Reg: 02-09-14
11-16-19 10:36 PM - Post#2780330    
    In response to 1983G20Van

Thanks for all the input everyone! I've had the intake off before. It's a flat tappet with a roller style block but not drilled.




 
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