[petes74]

Hello everyone,

I was thinking of installing roller rockers and wanted to also switch to a 1.6 ratio. I still have my stock .202/.160 heads. Someone had mentioned to me that you can put the 1.6 rockers in but you have to do a little work on the heads so the push rods do not rub.

Does anyone have more info on this?

Thx in advance for the help.

Pete

 

[[email protected]]

just going to roller will reduce friction and bumping to 1.6 ratio will give a little more.. heres an article you might find interesting on the subject http://www.chevyhiperformance.com/t..._comp_cams_ultra_gold_roller_rockers_install/

 

[david78]

I changed to the comp cam 1.6 Roller Rockers
and made no modifications
and the engine felt lighter

 

[lostvette]

1.6 rockers will only give u .030 more lift. eadHorse:

 

[bluedawg357]

1.6 rockers will only give u .030 more lift. eadHorse:

That depends on the camshaft. If you devide the valve lift by 1.5 and then multiply it by 1.6 which will yield the new valve lift.

 

[[email protected]]

That depends on the camshaft. If you devide the valve lift by 1.5 and then multiply it by 1.6 which will yield the new valve lift.

:thumbsup3:

 

[petes74]

I changed to the comp cam 1.6 Roller Rockers
and made no modifications
and the engine felt lighter

The heads on your 78 have ob longed holes where the push rods go. Allowing more room around the push rod. The heads on my 74 have round holes. There is very little room around the push rod. So I think I'll stick with the 1.5's

 

[toobroketoretire]

The heads on your 78 have ob longed holes where the push rods go. Allowing more room around the push rod. The heads on my 74 have round holes. There is very little room around the push rod. So I think I'll stick with the 1.5's

Heads that use the 1.75"/1.5" valves and the 1.937"/1.5" valves use a center-to-center valve spacing of 1-3/4" as does the lifters but the heads that use the larger 2.02"/1.6" valves use a valve spacing of 1-7/8" and MUST use guide plates because the valve spacing is 1/8" wider than the 1-3/4" lifter spacing. The smaller valve heads use simple slots to guide the push rods whereas the larger valve heads use 1/2" holes because the guide plates do the, uh "guiding". Simple as that..................