330 (at the lobe) then with stock 1.5 ratio's you will get. i means for every 1 measurement of travel, your rocker will lift your valve 1.6, 1.5 or 1.65 so for example, if you have a cam that lifts to. The 1.6/1.5/1.65 is a ratio, not a measurement. stock SBC are 1.5, it looks like stock 6 cylinder holden are also 1.5 (but you will need to confirm that) stock 308 are 1.6. the thing you gotta find out is what ratio your standard rockers are. regardless, you will prolly get valve bounce with 499. any more than that and you are pushing the friendship. stock springs on a 308 can handle anywhere around 499 lift. Lol, i just had a look at the cam specs and realised that i had no idea what is acceptable with stock springs on a 6. and if they dont, they should be one of the first things to go on. Have I got any hope of setting up roller rockers in this configuration?Ĭlick to expand.let me start by saying that every engine should have roller rockers.
#Yella terra rockers sbc driver
The engine is for a daily driver so I'm not going to be wringing its neck all the time. I know the standard springs aren't ideal, but I plan to change them later if they give any trouble. With hydraulic lifters, standard push rods and standard valve springs. I'm running this cam: WER 2 Crow Megatork Hydraulic 6CYL Cams HOLDEN 149 - 202 - eBay Engine Parts, Engines, Components, Car Parts, Accessories, Cars, Bikes, Boats. I'm a bit confused about this whole roller rocker thing. The pad has been shaved 8mm or so, so in theory these should fit: Yella Terra Holden All Red, Blue, Black, Motors Roller Rockers - Street Terra 1.6:1 7/16 screw in studs mount ST2012 - Kustom BitzĪnd then I would have to also buy the correct studs and guide plates? Ok so I checked the bolt holes in the head, they've been drilled out and tapped to 7/16, the original size was 5/16.
Mate, advice is if you want to keep the enigne running for a long time at high rpm, your gonna have to spend the dollars on a good set.ģ85 bucks isnt that bad for street terras VPW Performance MailorderĮdit* that link is for 1.5's and your were 1.6. mind you, i have not adjusted them fully yet. they are made really cheaply, the roller bearings are unsealed, unlike the yella terras i have on my commodore, the roller tips wobble around and they are noisy as f.k. I dove in a bought a set of those procomp roller rockers for my impala cos' 175 bucks for a V8 is half the price. bear in mind you may also need guide plates for your pushrods, but im not sure with 202. if you get the wrong size, good luck finding posi locks by themselves, its easier to just change the studs. The size refers to the posi locks that you get with the roller rocker. just pop the spanner (the ring side, not the open side) over the thread and which ever spanner slides on with no room is the size you need. You need to grab a 7/16 spanner and a 3/8th spanner and figure out which thread the head studs are before you look any getting anything. Or am I just better to fork out for the yella terra ones? Or are there any other options(other than changing the head)? (end time 22-Dec-09 17:07:59 AEDST)īut does anyone know if they'll fit my head? I think I'd need to change the studs. These ones are more in my price range: HOLDEN 6 202 TORANA ROLLER ROCKER KIT 1.6 7/16 - eBay V8, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. I found these yella terra rockers that require the head to be modified the way mine has been but they're very expensive: Yella Terra Holden All Red, Blue, Black, Motors Roller Rockers - Street Terra 1.6:1 7/16 screw in studs mount ST2012 - Kustom Bitz
The rocker pads have been shaved 5 mm or so and the holes have been drilled and re tapped. But I only just noticed as I was going to bolt the rocker gear on that it has been modified for I think, roller rockers. Hi all, I have just about finished building a blue 202 for my vc and I put a second hand head on it thats had a fair bit of work done to it.
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