Hey, do yella terra do street terra rockers for the 304 block? I was talking to a bloke from crow cams that thinks they only come in yella terra. If so, i have a hyd cam with .495" of lift and 230@50. Would these rockers give me more lift and duration? cheers
The Street Terra's are listed for both the 308/304 head design as they are pretty much the same in rocker gear.
ST 2032 bolt on non-adjustable
ST 2033 bolt on adjustable
both fit under standard rocker covers too.
The Yella Terra part numbers for the 304/308 are different.
The YT 6309 bolt on adjustables (304 heads) have a tiny tiny bit of offset on the rocker arms to suit the 304 head spot on where as the Street Terra's fit 99%.
Our roller rockers are a standard ratio of 1.65:1 for the holden V8 so no increase in valve lift and they wont change duration.