roller rockers

[the_formula]

i was thinking of swapping in some 1.7 rollers in my 2000 formula in place of the stock rockers..anyone know the hp gain with this? ...what else needs to be changed? springs ? lifters? pushrods?...

[TACE02]

I thought 1.7 is stock size...

[the_formula]

it may be...if so then 1.8?...anyway i still wanna get the rollers

[TACE02]

not completely sure, didn't go that route... But if you get the 1.8s you change your overrall lift, higher (not sure just how much though, I don't know the math for figuring it up). I would say you wouldn't be doing wrong by upgrading the rest of the valvetrain while you are there, ie. springs and pushrods.

Quick question: why not just install a cam and upgrade valvetrain? No need for upgrade of rockers then.

[tims02]

Mike,

Yes 1.7's are stock rocker size. Depending on who's product you read they claim a 10-20 h.p increase with the swap to 1.8 or 1.85 rockers. Also, depending on what your looking to do with the engine the stock pushrods should work just fine but as far as the springs go high mileage vehicles should look into changing springs,retainers and locks anyways. Just holler at me and we can do that when you get them.

[the_formula]

Mike,

Yes 1.7's are stock rocker size. Depending on who's product you read they claim a 10-20 h.p increase with the swap to 1.8 or 1.85 rockers. Also, depending on what your looking to do with the engine the stock pushrods should work just fine but as far as the springs go high mileage vehicles should look into changing springs,retainers and locks anyways. Just holler at me and we can do that when you get them.

i was wanting to get them when i get the headers....june sometime...getting a cam and heads for me will be a little hard to do due to budget..(as you may know tim) ...but i found the rockers for less than 200....so i thought maybe a cheap route for more hp.

[tims02]

yeah..H.P. is H.P. any way you can get it. What's the stock lift on the Firebirds cam?

[the_formula]

yeah..H.P. is H.P. any way you can get it. What's the stock lift on the Firebirds cam?

not quite sure on that ....havnt gotten that far with the specs yet

[TACE02]

1998 - 2000 Fbody
202/210 int/exh @ 0.05" duration
0.496" / 0.496" int/exh lift
116 LSA


http://www.smokemup.com/tech/ls1.php

[tims02]

Thanks Tace02. So with a set of 1.8 rockers your lift would be .525" / .525" and with a set of 1.85 rockers it would be .539" / .539"

[shady milkman]

be carefull with the springs...stock springs blow and can barely handle stock cam specs...i would deff upgrade the springs..when dealing with valvetrain..its better safe then sorry. the valvetrain is sorta like the spinal cord/nervous system of your engine...something goes wrong then so does everything else..be safe..upgrade your springs too.

[the_formula]

be carefull with the springs...stock springs blow and can barely handle stock cam specs...i would deff upgrade the springs..when dealing with valvetrain..its better safe then sorry. the valvetrain is sorta like the spinal cord/nervous system of your engine...something goes wrong then so does everything else..be safe..upgrade your springs too.

can this be done without removing the heads??...if so then tim it looks like we got some work to do soon.

[shady milkman]

yes springs are on the top...no head removal is required..its actually really easy...remove the valve covers .. its easy.

[tims02]

Mike,

Piece of cake buddy..Let me know when you're ready!!

[the_formula]

i just wasnt sure if the springs were off that the valves wouldnt drop

[tims02]

They will if you don't blow air into the cylinder to keep them up in the head.

[the_formula]

so i found a set of springs and rockers on ebay...what do ya think?

http://cgi.ebay.com/ebaymotors/COMP-...spagenameZWD1V

http://cgi.ebay.com/ebaymotors/Alumi...3286.m20.l1116

[tims02]

Mike,

They look fine. They'll do everthing you need them to do. Gonna get 'em?

[the_formula]

yea im gonna get em in june with the headers.

[nhraformula]

dont waste youre money.
i had 1.85 rockers in for a year then ditched them