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ratio comparison Here's a chart you guys might find interesting. It compares the ratio achieved with standard LS1 rockers to LS1 roller rockers. Both are 1.7 ratio but as you will see the roller tipped rockers have more ratio at lower lift than the non roller tipped ones even though they have...

25psi, blo thru, w2a intercooler, flat tappet cam, custom carb, ice ign, yt rockers, forged slugs, h beam rods 318 cubes with .100' o/s ground crank to fit chev piston/rod combo. Going into a hq. We pulled its pants off after a day on the dyno and all looks good.

Well we just pulled this thing off the dyno last week. It made 1020 HP and 1040 ft lb with standard crank, heads, block. Good pistons & rods of course.

They are 7/16" UNC thread with 5/8" head size from memory. There is one Allen headed Capscrew on the exhaust side with an imperial head. Cheers. Tappy.

yep......Rickshaw rockers those. What about the bolt on street terra's for a near stocker? Try YT direct or TTT Performance Engineering

We have nothing here for the early v6's but I would call Powerbond / precision parts in Wagga and see if they have done them or can do a one off. They were able to go 5% underdrive on the L67 balancers for us. Cheers. Mark.

Standard ratio on a VN is 1.6. We make lightweight billet rockers in 1.7 and 1.8. price will vary around the traps but high $600's is about the going rate. Standard ratio on a VT is 1.65. The Ultralight rockers for them come in 1.6 1.7 1.8 1.84 1.9 1.95 price is about the same as VN...

You can just buy the back plate (housing) from GM and swap it over. From memory it's not very dear. Be careful not to loose the clear plastic insulating washers that go inside the rear housing when you pull it apart.

Ah Deek. I didn't know you were a "whine connoisseur".:my:

Great stuff Tim. Good to see the car now goes as good as it looks.

Well thanks roger05 but the website is still a while off. It's gunna be a big one. defa' you can run 1.8's on the VN if the camshaft is still standard. if you don't know what size mounting bolts they are you will have to call and we can tell you (up to what engine numbers had 3/8' and what had...

Roller rockers have roller bearings in the trunnion (pivot point) and a roller on the tip where it pushes on the valve.

And Chipcontrol in Sunbury.

Sorry if that black thing is holding you up Tim. It's becoming a bit of a rush to get it finished now.

What a nice guy that Hellfish feller is. Sounds like he really knows his rockers too. lol

Only with an adapter plate, or intercooler as adapter.

Send the busted one in to YT so we can have a look too. If there is too much rocker rotation the alloy arm can hit on the mounting pedestal. It's almonst cirtainly a mechanical interference problem of some sort so I would suggest you track down the cause before buying anything and know that you...

ABSOLUTELY. And the LS1 MAF while your'e at it. Just do a dummy fit up first and then fit them permanantly at the dyno shop. You won't be able to drive around with them on untuned.

The inlet usually runs on the passenger side and the reg on the drivers side. All you need to do is to swap the rear fittings over and maybe run a longer feed line. Once you get it tuned and start upping the boost is when you really notice the torque the PD blowers produce. IT'S ALL JUST TOO...

Quite right and well spotted surfwagon. Hey VN HAHAHA I told you it would be a handfull..:thumbsup: Wait till it's tuned :yeah:

Gotta be carefull with auto's though. A bigget T/B will change the TPS signals and can make the auto shift funny.

High ratio rockers will open the valves further and faster but they will not change the compression, the gross duration or the overlap. They may reduce the measured boost pressure slightly by alowing the engine to use more of the air from the blower. On a S/C engine the rockers tend to...

Ahhhh very nice. great job. That car is going to be a real handfull when you're done. IF IT AINT BLOWN, IT SUCKS (technically speaking) :whistling

Mikes Dyno Tuning / the 308 shop (Mike Trahar) he's got a blown alky one there too, at the moment, and tuned a Terracharged one last week.