2002/2003 rocker ratios?

[jabartram]

i'm working on a deal for a set of ported heads, i can get a set of 2002 heads with proper bolts and rockers, i know the hold down bolts are 10mm on 2002 and 8mm on 2003 but is there a difference in rocker ratio? 2003 are 1.6 .

[mfuller]

Pretty certain they're all (roughly) 1.6:1 on the 3400.

[jabartram]

cool, thanks for the quick answer, i just read on 60 degree v6 that a company is malking direct drop in 1.7 and 1.8 rockers for the 3100, 3400 and 3500.

http://60degreev6.com/forum/f96/coming-soon-higher-ratio-rockers-t41314

[mfuller]

cool, thanks for the quick answer, i just read on 60 degree v6 that a company is malking direct drop in 1.7 and 1.8 rockers for the 3100, 3400 and 3500.

http://60degreev6.com/forum/f96/coming-soon-higher-ratio-rockers-t41314

Yup, and full rollers that will use the factory pedestal mounts (so hopefully, no guide plates). Thinking about pairing some with my 1280 cam. Manley valves too - reported to be better for boost or nitrous.

[jabartram]

i'm gonna stick with the stock cam, but run ported updated heads and 1.7 rockers. and tune, tune, tune.

[-Alero-]

damn thats pretty good news, ill have to hop on that, stock pusrods and modifed pushrods work with those rollers?

[kwhauck]

yeah geteck is thinking 1.7 with my lope of a cam.......

[kwhauck]

i'm gonna stick with the stock cam, but run ported updated heads and 1.7 rockers. and tune, tune, tune.

booo!!!! come on through a big lope in there like me!!!!

[jabartram]

new question, what are the benefits/drawbacks to stainless steel valves?

[-Alero-]

new question, what are the benefits/drawbacks to stainless steel valves?

titanium is better? lol i dunno

[Midgear]

all this talk about tuning.. lol. I dont know the first thing about tuning, and if I asked a shop around here for "tuning" help.. they'd look at me like "LOLWUT?!"

this town sucks.

[mfuller]

Well, my understanding is stainless valves hold up to the heat better, and when modified, will flow more than stock (at least in the case of SI valves for the 3400). They are also a bit lighter than stock 3400 valves, and bump the static compression ratio up a smidge. They do cost more than stock valves, and for extremely high spring rates (or if they aren't installed correctly), I have heard of some people breaking the tip off the valve stem.

[jabartram]

i thought the stainless valves might be heavier than stock? i'm looking at the ones milzy carries, the heads im getting will be coming with ls1 springs but no valves.

[-Alero-]

i thought the stainless valves might be heavier than stock? i'm looking at the ones milzy carries, the heads im getting will be coming with ls1 springs but no valves.


arent the stock ones steel? or are they iron.....i mean even still the SS valves would be the obvious upgrade over the stock ones, and my guess is even IF they were heavier they would be stronger in the areas needed most

[mfuller]

According to Ben @ WOT-Tech:
stock:
3400 intake = 97.8 grams
3400 exhaust = 84.3 grams

I can't seem to find the stainless weights but I know 3500 valves are lighter yet.

Ben stated that he liked the one-piece stainless valves since they had more material on the backside of the valve head to work with.......it really didn't matter because my heads came with the stainless valves.

[-Alero-]

According to Ben @ WOT-Tech:

Ben stated that he liked the one-piece stainless valves since they had more material on the backside of the valve head to work with.

yeah thats what im saying

[jabartram]

i'll be doing back cutting on the valves so i'll need the extra metal. but i have always done it with stock valves.

[alerored04]

I have SI valves that I bought off of Germ, he suggested them to me because of my cam and what he explained as the high spring pressures produced by a high lift cam. He said that the SI stainless valves would hold up to that much better than stockers. Thats all I know though. I needed new ones anyway after bending most of mine so it worked out great.

[-Alero-]

valve clash is a no no

[alerored04]

Yeah, my exhaust valves were not pleased to meet the pistons. It was ugly. The pistons won that fight.

[-Alero-]

ha thats funny

[Redog]

Yeah, my exhaust valves were not pleased to meet the pistons. It was ugly. The pistons won that fight.


HA HA they usually do ;)