Rocker ratio
Thread Starter
Intermediate
Joined: Apr 2011
Posts: 41
Likes: 0
Rocker ratio
Hello I'm putting new heads in my 79 L-82 with stock cam with heads that are 200cc. 64 cc. My question to anyone out there is what would be the better roller rocker ratio use 1.5 or 1.6 rocker ratio.i am thinking of going with 1.5 ratio rocker. Any advice and experiences appreciated.
Racer
Joined: Oct 2006
Posts: 255
Likes: 3
A 1.5 ration will be about the same as the stock rocker, however going to 1.6 will actually change the lift of the cam slightly. If I remember I think it will be about .010 - .015. Someone else will probably give a definate lift increase but I dont think with a stock cam you will notice much of a difference in idle or performance.
Best of Luck
Rodney
Best of Luck
Rodney
Le Mans Master
Joined: Oct 2010
Posts: 6,937
Likes: 848
From: melbourne florida
2023 C3 of the Year Finalist - Modified
you will get more of a bump from the rise in compression and increased flow. a lot of people go 1.6 on the exhaust side. if you have the stock cam in it you will have a nice combination.
Melting Slicks
Joined: Oct 2011
Posts: 2,748
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From: Sacramento California
C2 of Year Finalist (performance mods) 2019
2018 C2 of Year Finalist
I put Scorpion short PolyLock full rollers under my stock valve covers. I use a double thick gasket, and had to remove the baffles. No other issues.
1.6 are not any taller than 1.5.
200cc runner is a little large for a stock 350......
1.6 are not any taller than 1.5.
200cc runner is a little large for a stock 350......
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Divide the lift by 1.5 & multiple by 1.6. This will give you the valve lift. I did the same thing on the l48 which made a difference but ended up changing the cam and then went 1.6 on the new cam a little latter on. It made a difference birth times. I went 1.6 on both intake and exhaust.
Last edited by bluedawg; Apr 15, 2013 at 02:22 AM.
Drifting
Joined: Jan 2006
Posts: 1,832
Likes: 38
From: Cedar,BC
Spend your money on a camshaft instead.Rockers aren't really going to help you at this point,chances are you will really be disappointed with those heads by not replacing that pick-up truck camshaft.
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Le Mans Master
Joined: Apr 2006
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200cc runner aftermarket heads are going to be clearenced for 1.6 rockers. The L82 camshaft is not a pickup truck camshaft has around 224 .050 intake duration. I would do the 1.6 rockers to help the lift on L82 camshaft they cost no more to buy then 1.5. Sure there are aftermarket cams that could yield you more power if you want to pull the cam and lifters. The lunati vodoo cams were designed by one of the best camshaft guys in the business a few yrs ago have good lift, with one of these cams installed id use a 1.5 rocker. To be honest if i had it tore down that far i would change the cam. What springs are on your 200 runner heads, are they for flat tappit cams !!!! You could well be putting hydraulic roller springs on your flat tappit to much pressure.
Last edited by Little Mouse; Apr 15, 2013 at 08:49 AM.