wes3s

We run a dirt track car its under 400hp. its 40 over 350. we run 487x heads. will rocker arms from a 5.3 work on this application. we have roller tips with screw in studs. and what bare the ratios on the ls rocker arms. these are pre 80"s heads

slogo

Factory rocker ratio for 5.3 is 1.7 and then for the larger engines ratio goes to 1.8
the diameter of your screw in studs (3/8)?(7/16) are to big to slide these rockers on.
And then I would wonder if the different valve angle would play a part in all this.
You might can get them to work, but it is not going to be just a bolt on. Personally I would just use an aftermarket 1.6 rocker that is designed for your heads. Good Luck

KCS

iTrader: (20)

I read about a month ago about a retro fit kit to use LS rockers on the SBC heads; but I couldn't find anything online. Now I can't remember what company was making them either. The LS rockers have trunions drilled for an 8mm bolt, so I would imagine the kit requires the rocker bolt holes to be helocoiled for an 8mm thread and custom stands.

I have seen a couple applications where the smaller 8mm valves were used in a SBC head, along with beehive springs, keepers, and retainers from an LS.

wes3s

my machine shop told me no way no how they will work. cause there 1.7 ratio

S10xGN

iTrader: (11)

The ratio is not the issue, it's the pivot distance (distance between the valve centerline and rocker's bolt/stud centerline)...