has anybody here put roller rockers into a carbie 308. if so, how much power gain was achieved. ive rang around a few places and was told by a few that only very minimal gains were to be had by installing solid roller rockers into the early 308's (carbies). and for $720, it wouldnt be worth it if this is true. the motors a 355 stroker , with torque power single plane high rise manifold, 800cfm carbie,big cam etc. thanks in advance btw, the rollers i was looking into were yella terras

Roller rockers arent generally installed as a power gain. Theyre installed to allow the motor to rev harder safer. Instead of your rockers bashing around, they roll on the little rollers on the end... lol that sounded stupid. Basically its like adding an intercooler to a turbo car, not generally for more power, but to do it safer. How hard you going to be revving the 355?

Quote: Originally Posted by DVLISH has anybody here put roller rockers into a carbie 308. if so, how much power gain was achieved. ive rang around a few places and was told by a few that only very minimal gains were to be had by installing solid roller rockers into the early 308's (carbies). and for $720, it wouldnt be worth it if this is true. the motors a 355 stroker , with torque power single plane high rise manifold, 800cfm carbie,big cam etc. thanks in advance btw, the rollers i was looking into were yella terras By the sounds of it its not a bad motor,If your got a big cam in it why wouldnt you get some adjustable rollers?What size cam is in it,is it a hyd or solid??

Yeah, i have a mate with a 378 stroker in a falcon and he doesnt have rollers, he just loves it as a torque machine and never really revs it much past 3k. Up a hill towing a car in top gear we were passing other cars in top gear at like 1800rpm! But... back on topic

Quote: Originally Posted by TWO89 Roller rockers arent generally installed as a power gain. Theyre installed to allow the motor to rev harder safer. Instead of your rockers bashing around, they roll on the little rollers on the end... lol that sounded stupid. Basically its like adding an intercooler to a turbo car, not generally for more power, but to do it safer. How hard you going to be revving the 355? I agree here. Remember should you buy these and want to fit them yourself if they are bolt ons ur really supposed to measure all your clearances incase the rockers need to be shimmed before fitment. Otherwise should you buy the fully adjustables (which i thought were around the $750 and thought the non adjustables were about 500) You need to measure everything anyway but every couple of months you'll need to get back in there and check everything and tighten them up. You do only really gain a minimal improvement...not noticeable. The only time you would probably see a significant increase would be on a massive HP car with the fully adjustables on (for which you would need them anyways).

Depends on the cam. After i would tighten them (solid cam) there was a nice power increase. Probably around 10-15kw. You could also hear the exhaust note was much crisper.

Quote: Originally Posted by TWO89 Depends on the cam. After i would tighten them (solid cam) there was a nice power increase. Probably around 10-15kw. You could also hear the exhaust note was much crisper. Yup, i was always taught that when fitting bolt on rockers to measure the clearances if its not the standard cam...no matter how small it is. in reality though if its a few sizes up it shouldnt be an issue.

correct me if im wrong, but i always thought due to the rollers having higher ratios, that inlet valves would open and close quicker, resulting in some sort of a power gain (plus the added benefit of safe rocker operation due to rollers)

fitting rollers to a holden V8 gives slightly more lift due to the different ratios. but not really noticable in terms of power gains as said before they're more for hi-revs

When I first fitted them to mine I noticed a slight power gain plus much better throttle response.

my brothers car picked up 35hp on the engine dyno with fitment of roller rockers, they were a diff ratio so the 286 had at least .35 more lift and also put solid lifters instead of hydrolic ones.....