1.6rr
Thread Starter
Racer
Joined: Oct 2004
Posts: 278
Likes: 23
From: Rock Hill, SC [RCG] KANUCK
1.6rr
Was wondering if I were to install 1.6rr on a stock 85 engine would I see any improvment in it or would it just be a waste of time and money. Also, would I need to modify my valve covers to do this.
Thanks
Thanks
Race Director
Joined: Jun 2004
Posts: 13,944
Likes: 705
From: WI
There can be a gain with the increased ratio. But, new springs would be a good idea. Also while you are there, valve seals are cheap. You can buy expensive narrow body rockers, or grind down the valve covers and save a lot of cash.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
Yes, you will see a small gain. I would suggest 1.5 on the exhaust and 1.6 on the intake. Several posts have suggested that this combination runs and idles better on the 1985. I installed this combo on my 85 and noticed a difference. I did not dyno this change, but there was a positive difference. You will have to grind off the drip tabs on the inside of the valve covers. Do not try and break them off, you will break a hole in the cover.
I do agree that this would be a good time to change out the springs and seals if you have high miles on your car.
I do agree that this would be a good time to change out the springs and seals if you have high miles on your car.
Thread Starter
Racer
Joined: Oct 2004
Posts: 278
Likes: 23
From: Rock Hill, SC [RCG] KANUCK
So, from what everyone is saying, is worth the effort then. I have a spare set of valve cover, so I can rework those. Any suggestions as to what brand to buy?
From what you are saying then, only need to buy 8 instead of 16 then, or do I need to buy 8 1.6rr and 8 1.5rr?
Thanks
From what you are saying then, only need to buy 8 instead of 16 then, or do I need to buy 8 1.6rr and 8 1.5rr?
Thanks
Pro
Joined: Nov 2006
Posts: 638
Likes: 0
From: Plano TX
If you go the 1.5 exhaust / 1.6 intake route and want full roller rockers, buy 8 1.5 rrs and 8 1.6 rrs. I'm not sure that I'd mix.
Last edited by evmlarry; Jun 3, 2007 at 12:23 PM. Reason: Fixing typos since I was a little tipsy last night writing this....
Instructor
Joined: Dec 2006
Posts: 114
Likes: 0
From: Florida
since were talking about this....what is the specs on the 96 lt1 intake and exhuast and valve lifts and all that...im looking for a cam that i can put but leave the rocker arms and such stock...for now..
Melting Slicks
Joined: Jul 2003
Posts: 2,140
Likes: 0
From: Cincinnati Ohio
Race Director
Joined: Feb 2003
Posts: 11,671
Likes: 20
From: Lake Wylie SC
Hi Pete,
The best way to grind down the drip tangs is to use a Dremel tool and a small cutting wheel. It's best to use the Dremel with the extention so the filings don't short out your tool. Ask me how I know. As far as which rockers, I'd stay away from Crane's aluminum ones as they get noisy and set off the knock sensors. I'm thinking about the S/S rockers, and I'd really suggest new valve springs while you have the rockers out. How about a cam? I know it's tough to keep up with our clubs Z06s, but we C4 guys have to try.
Tom
The best way to grind down the drip tangs is to use a Dremel tool and a small cutting wheel. It's best to use the Dremel with the extention so the filings don't short out your tool. Ask me how I know. As far as which rockers, I'd stay away from Crane's aluminum ones as they get noisy and set off the knock sensors. I'm thinking about the S/S rockers, and I'd really suggest new valve springs while you have the rockers out. How about a cam? I know it's tough to keep up with our clubs Z06s, but we C4 guys have to try.
Tom
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
On a budget, you can go with stamped steel rockers just like the stockers, except for the ratio. They are fine for a mild engine, and no valve cover work is necessary.
Be sure to check for interference between the push rods and the head with the higher ratio rockers.
RACE ON!!!
Be sure to check for interference between the push rods and the head with the higher ratio rockers.
RACE ON!!!