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Roller rockers question?

vms4evr

Well-known member
Joined
Jul 18, 2001
Messages
466
Location
Durham, NC
Corvette
2002 Flat Black Z06
I've been thinking of converting the standard rockers to roller rockers on my LT1. I've seen 1.5 and 1.6 for added lift. I hear it smooths out the valve train and if you go to 1.6 you get more lift so it also acts like a slightly bigger cam and about 20hp boost.

GM performance has some along with Crane and other vendors.

Have any of you tried this?

Any pros/cons to this approach?

Thanks, Graham
 

JT ZR-Won

Well-known member
Joined
Dec 6, 2000
Messages
1,291
Location
Bradenton, FL
Corvette
'90 ZR-1 #3010
I've heard the way to go is the 1.6 roller rockers for the LT-1. If they made them standard on the LT-4, they must be beneficial. I think a good combo would be to do the rockers along with a cam at the same time. You'd probably notice a considerable amount of power with that setup......

Jay
 

grumpyvette

Well-known member
Joined
Apr 17, 2001
Messages
841
Location
Loxahatchee, FL, Palm Beach co
roller rockers 1.6

I have done this on several LT1S .JUST SOME INFO. THE ROCKERS YOU GET (must) be for center bolt valve cover heads(narrow body) and they( must) be the (self aligning) kind and they (must) be the 3/8" stud model to fit( crane # 10758-16 I think I used) or the chevy rockers or comp cams makes a set of chrome moly steel ones I think but no mater which ones you get you will have to grind the drippers in the stock valve covers shorter and use a thick valve cover gasket to clear the poly locks extra height(you can not get tall valve covers because the alternator and other brackets leave insufficient room to fit them under the brackets(use a dremmel to cut off the drippers as breaking them off can crack the valve covers) just hopeing to keep you out of trouble and yes they are worth the trouble the car does run better at higher rpm levels
 

fastglass95

Well-known member
Joined
Jan 27, 2001
Messages
208
Location
St. Peters, MO.
Corvette
1996 LT4 coupe + 2004 Z06 Z16
Thanks!

Hey, thanks for the info "Grumpyvette",
I may have to try this over the winter.
I need all the power I can get to stay ahead of my competition in NCCC autocrossing. By rules, I must run the G.M. LT4 rockers, will they work on a LT1 ? (removing drippers and thicker gasket included)

Thanks,
 

silver 80

Well-known member
Joined
Jul 9, 2001
Messages
562
Location
madison,wi
Corvette
1980 silver with blk interior 1987 blue / blue
roller rockers

Fastglass95,
How modified can you go?
tom
 

silver 80

Well-known member
Joined
Jul 9, 2001
Messages
562
Location
madison,wi
Corvette
1980 silver with blk interior 1987 blue / blue
LT1 mods

Graham,
I did the switch to my.........95firehawk, I went and bought the LT4 intake, heads, RR, valave covers,HD timing chain, LPE cam. It screams. I noticed that Jim Pace now sells a kit for this for a little over 2K might want to check out their web site.
www.paceparts.com
tom
 

vms4evr

Well-known member
Joined
Jul 18, 2001
Messages
466
Location
Durham, NC
Corvette
2002 Flat Black Z06
thanks grumpyvette!

i pulled the part listings and you got it on the Crane part.
i was told about having to hit the drippers with a dremmel but no one said anything about a thicker gasket. good point.

fastglass95 (fyi) - from Crane

10758-16 = 1.6 Gold Race
10308-1 = Spring and Retainer (need 16 no ?)
99795-16 = 1.6 - 3/8 adjusting nuts

apparently you will need their lock nuts and you are supposed to use their springs because the stock ones won't work right.

graham
 

vettenuts

Well-known member
Joined
Nov 13, 2000
Messages
123
Location
Wakefield, RI
Corvette
2002 Mag Red Convertible
I would also suggest you consider new springs. With 1.6 rockers, the springs come very close to hard bottom. Every time I read about this mod on the LT-1 in a magazine, they always change the springs.
 

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