1.6 roller rockers for a 1986 lb9
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Joined: Jun 2014
Posts: 393
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From: Montana
Car: 1986 Trans AM WS6
Engine: 383 Vortec TPI, PUTS SMILES ON FACE
Transmission: PATC LVL 3 Raptor Transmission
Axle/Gears: 3.27 POSI 9 BOLT
1.6 roller rockers for a 1986 lb9
Got me a nice set of 1.6 ratio fully roller rockers for my lb9. will i run into any problems?
Last edited by happyhapka; Apr 18, 2017 at 04:41 AM.
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Posts: 3,178
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From: Tracy, CA
Car: '87 IROC
Engine: LB9
Transmission: TH700R4
Re: 1.6 roller rockers for a 1986 lb9
Assuming it's a stock, un-modified, original to the car engine...
1. You should confirm that the rockers you have are not the self-aligning type.
2. You need to elongate the push rod holes in the cylinder heads.
3. You need to check for proper push rod length.
4. Depending on the brand of rockers, there might be other modifications necessary, such as guide plates, screw-in rocker studs, etc.
By the time you finish No. 1 and get to No. 2 above, you'll probably realize that it's probably not worth the time (money) to install them on a stock LB9.
1. You should confirm that the rockers you have are not the self-aligning type.
2. You need to elongate the push rod holes in the cylinder heads.
3. You need to check for proper push rod length.
4. Depending on the brand of rockers, there might be other modifications necessary, such as guide plates, screw-in rocker studs, etc.
By the time you finish No. 1 and get to No. 2 above, you'll probably realize that it's probably not worth the time (money) to install them on a stock LB9.
Thread Starter
Member
Joined: Jun 2014
Posts: 393
Likes: 2
From: Montana
Car: 1986 Trans AM WS6
Engine: 383 Vortec TPI, PUTS SMILES ON FACE
Transmission: PATC LVL 3 Raptor Transmission
Axle/Gears: 3.27 POSI 9 BOLT
Re: 1.6 roller rockers for a 1986 lb9
Whale ****! And thats alot of ****.
so how do you elongate the pushrod hole. I got the self aligning narrow body scorpion full roller set.
Last edited by happyhapka; Apr 18, 2017 at 06:05 PM.
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Re: 1.6 roller rockers for a 1986 lb9
A stock 1986 does not and can not use self-aligning rockers.
If the LB9 has the stock cam there should be no other modifications required. The cam in the LB9 has lifts below 0.400 so anything will help, but don't expect any really noticeable gains in performance. Springs, guides, pushrods, and seals will all be just fine with 1.6:1 rockers - IF the rockers do not have some odd geometry.
I put Cranes on my '86 with no other changes.
If the LB9 has the stock cam there should be no other modifications required. The cam in the LB9 has lifts below 0.400 so anything will help, but don't expect any really noticeable gains in performance. Springs, guides, pushrods, and seals will all be just fine with 1.6:1 rockers - IF the rockers do not have some odd geometry.
I put Cranes on my '86 with no other changes.
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From: Somewhere
Car: 88 IROC
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 10 bolt 3.73
Re: 1.6 roller rockers for a 1986 lb9
Those are not the right rockers for a stock 86. I did put on a set of 1.6 rockers on my peanut cam 88 and they bolted up with no mods or clearance issues.
Thread Starter
Member
Joined: Jun 2014
Posts: 393
Likes: 2
From: Montana
Car: 1986 Trans AM WS6
Engine: 383 Vortec TPI, PUTS SMILES ON FACE
Transmission: PATC LVL 3 Raptor Transmission
Axle/Gears: 3.27 POSI 9 BOLT
Re: 1.6 roller rockers for a 1986 lb9
The ones i got are for my vortec build. Wasnt sure if i could use it on my 86 set up.. not sure if 86 was self aligning or not.. what would i need to change?
Joined: Mar 2017
Posts: 4,255
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From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: 1.6 roller rockers for a 1986 lb9
86 LB9 is one year before they went to hydraulic roller cams and consequently self-aligning rockers. You need the Comp 1416-16 rockers for a stock 86 peanut cam.
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Supreme Member
Joined: Jan 2000
Posts: 3,178
Likes: 48
From: Tracy, CA
Car: '87 IROC
Engine: LB9
Transmission: TH700R4
Re: 1.6 roller rockers for a 1986 lb9
IMO, it's best to physically check to determine what type of rockers (self vs. non aligning) should be used. The heads could have been swapped. Also, who's to say that previous repairs/modifications were done correctly?
Another example: The engine in my '87 has heads that were cast on October 16th and 20th, 1986. The engine is original to the car. It's a roller cam engine and does not have self aligning rockers.
Another example: The engine in my '87 has heads that were cast on October 16th and 20th, 1986. The engine is original to the car. It's a roller cam engine and does not have self aligning rockers.
