1.6 RR's on bolt on car
Thread Starter
Teching In
Joined: Apr 2007
Posts: 16
Likes: 0
1.6 RR's on bolt on car How much power can be gained on a full bolt on LT1? Is it a noticable gain? Also I would think aluminum would be better since its lighter but Ive read a couple people think they are not as strong as steal and suggest avoiding them.
A lot of its probably has to due with putting in new valve springs, lot of guys have a ton of miles on the stock valve springs, bet a lot of cars are just making better power due to the fresh valve springs.
Thread Starter
Teching In
Joined: Apr 2007
Posts: 16
Likes: 0
Originally Posted by BizZzatch350
A lot of its probably has to due with putting in new valve springs, lot of guys have a ton of miles on the stock valve springs, bet a lot of cars are just making better power due to the fresh valve springs.
Well If it requires changing springs might as well swap the bump stick.
Trending Topics
Originally Posted by trailblazr81
Well If it requires changing springs might as well swap the bump stick.
True, but that requires buying the cam, all the necessary gaskets for the swap, a timing set, possibly lifters & pushrods and not to mention tunning after its all said and done.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
man now that you brought it up...what is the lift on a stock 96 cam with 1.6rr and the max lift on stock springs?
and can you use a spring thats good for like 550 lift with the stock cam and 1.6rr?
i should know this...ive done the came stuff before...i just went big the first time...thinking about bolting some on my dailly
and can you use a spring thats good for like 550 lift with the stock cam and 1.6rr?
i should know this...ive done the came stuff before...i just went big the first time...thinking about bolting some on my dailly
This is a quote from Vette magazine where they did chasis dyno testing of a stock LT1 vette. They dyno'd the car before and after the 1.6 roller install this is what they said:
"The heavy hitter in the group is a set of 1.6-ratio extruded-aluminum roller rockers from Comp Cams. By raising the LT1's valve lift from .447-inch/.459-inch to a more aggressive .477-inch/.490-inch, the rockers boosted rear-wheel output by an impressive 11.4 hp and 10.2 lb-ft of torque. Self-aligning and built on a narrow-body design, these units clear the LT1's center-bolt valve covers and can be installed with no additional modifications. SLP does, however, recommend upgrading the valvesprings on any 100,000-plus-mile LT1 engine."
Of the mods they did this was the best gainer.
Also GM High Tech Performance listed the top 10 mods for the LT1 (bang for the buck) here is what they said:
A higher ratio, roller tip and roller bearing, narrow body, self-aligning rocker arm that beats the stock part in every aspect. The high ratio (stock is 1.5) facilitates increased engine induction by increasing valve lift. Fancy roller-bearing design helps cut parasitic losses from valvetrain. The rockers give a good boost to an otherwise lethargic stock LT1 valve lift.
The Catch:
May require some minor clearance work to factory steel valve covers.
Ease of Install:
Moderate
Wear and Tear:
Moderate
Approximate HP gain / ET reduction:
10 HP
Cost:
$366.69
Cost versus gain:
$36.67 PER HP
Hope this helps.
"The heavy hitter in the group is a set of 1.6-ratio extruded-aluminum roller rockers from Comp Cams. By raising the LT1's valve lift from .447-inch/.459-inch to a more aggressive .477-inch/.490-inch, the rockers boosted rear-wheel output by an impressive 11.4 hp and 10.2 lb-ft of torque. Self-aligning and built on a narrow-body design, these units clear the LT1's center-bolt valve covers and can be installed with no additional modifications. SLP does, however, recommend upgrading the valvesprings on any 100,000-plus-mile LT1 engine."
Of the mods they did this was the best gainer.
Also GM High Tech Performance listed the top 10 mods for the LT1 (bang for the buck) here is what they said:
A higher ratio, roller tip and roller bearing, narrow body, self-aligning rocker arm that beats the stock part in every aspect. The high ratio (stock is 1.5) facilitates increased engine induction by increasing valve lift. Fancy roller-bearing design helps cut parasitic losses from valvetrain. The rockers give a good boost to an otherwise lethargic stock LT1 valve lift.
The Catch:
May require some minor clearance work to factory steel valve covers.
Ease of Install:
Moderate
Wear and Tear:
Moderate
Approximate HP gain / ET reduction:
10 HP
Cost:
$366.69
Cost versus gain:
$36.67 PER HP
Hope this helps.
1.6 RRs are worth it from the reading I have done. Just make sure you do springs and the proper locks, retainers, etc. with them. Stock springs are more than likely tired. Any lightening of the valvetrain can do wonderful things. Not to mention, it's a good half-step if you can't afford a cam swap yet.
Thread Starter
Teching In
Joined: Apr 2007
Posts: 16
Likes: 0
Well if its recomended to change the springs, I'll just swap the cam. But then I would probly remove heads to change the springs. And since the heads are off might as well do a little port n polish during the rebuild, right??!! The viscious, never ending cycle. 
Just change a $200 mod to a $2,000 mod.
Just change a $200 mod to a $2,000 mod. 
still worth it in my book but use good parts.for rpm and durability
1.7/16 studs
2.gm guide plates
3.hard push rods
4.918 springs,titanium ret,10*locks
5.1.7 roller rockers
6.good clutch/3200-3600 stall
1.7/16 studs
2.gm guide plates
3.hard push rods
4.918 springs,titanium ret,10*locks
5.1.7 roller rockers
6.good clutch/3200-3600 stall
TECH Senior Member
iTrader: (3)
Joined: Oct 2006
Posts: 7,564
Likes: 4
From: Decatur, TN (N-W of Athens)
You don't need guide plates with SA Rockers, unless it's just for redundancy.
EDIT: Gah, I said "DO" and meant "DON'T" >_< Late edit, my bad
EDIT: Gah, I said "DO" and meant "DON'T" >_< Late edit, my bad
Last edited by Formula350; Apr 28, 2007 at 09:04 PM.