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05-30-2007, 03:50 PM
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#1
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Join Date: Nov 2005
Location: Edison
Posts: 7,855
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What rockers?
My machinist used different springs that I gave him, but they are rated at more lift, should I step up to 1.6 roller rockers? i didnt purchase any rockers yet. Whats the info on piston to valve?
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1984 Firebird
2000 Z28
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05-30-2007, 05:03 PM
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#2
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Mr Fantastic
Join Date: Aug 2004
Location: West Milford NJ
Posts: 7,917
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p/v should be checked any time you change heads, cam, or valvetrain parts...sometimes one combo works for one person and doesnt work for the next.
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Matt
B18B1 FTW
Last edited by GP99GT; 05-30-2007 at 05:03 PM.
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05-31-2007, 08:53 AM
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#3
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Join Date: Dec 2005
Location: Mount Holly, NJ
Posts: 242
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Quote:
Originally Posted by WayFast84
My machinist used different springs that I gave him, but they are rated at more lift, should I step up to 1.6 roller rockers? i didnt purchase any rockers yet. Whats the info on piston to valve?
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What do you mean "they are rated at more lift?" Higher spring pressure? Higher installed height? In either case I would stick with the stock ratio rockers. You could run into a lot of problems including retainer/seal clearance, piston/valve clearance and pushrod hole clearance. Keep it simple.
__________________
'81 Sport Coupe 229 V6 -Junked
'93 Z28 LT1 - Parting out
"Is that a rat? No, it's just a really fat mouse."
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05-31-2007, 09:38 AM
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#4
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,473
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If you want a nice set of rockers, just stick with a 1.5:1 or 1.52:1 set of roller rockers.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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05-31-2007, 09:45 AM
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#5
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Join Date: Aug 2004
Location: Ewing, NJ
Posts: 836
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there are many other things you need to check before you rtun those rockers like the installed hight of the spring and your valve guid height!
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(86 Fiero GT-2.8 4spd.)
(88 Dodge Dakota w/ \'97 318 5spd.)
(82 Chevy Silverado -Crew Cab, Dualie w/ 11ltr Caterpillar 3208 diesel out of concrete pump bolted up to TH400 w/ 22% overdrive.)
1995 Pontiac bonneville daily
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05-31-2007, 10:33 AM
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#6
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Join Date: Jan 2007
Posts: 5,623
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when they say rated for more lift it refers to cam lift. they are higher load springs. you don't have to upgrade if you don't want to.
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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05-31-2007, 11:11 AM
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#7
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Stalker
Join Date: Aug 2004
Posts: 12,077
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Quote:
Originally Posted by bubba428
when they say rated for more lift it refers to cam lift.
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true, BUT by using 1.6 ratio rockers say over 1.5 ratio, it makes the valve open more as if the cam had a larger lift. so you get more lift out of a given cam by larger ratio rockers.
Last edited by V; 05-31-2007 at 11:11 AM.
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05-31-2007, 01:21 PM
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#8
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Join Date: Dec 2005
Location: Mount Holly, NJ
Posts: 242
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Matt, getting back to your question, the only way to know for sure is to test the clearance with clay. Also, find out what adding more lift will do to your performance before getting the 1.6's. If anything, I would only run the higher ratio rockers on the exhaust side only to even out the I/E flow ratio. Bigger is not always better, and in your case I'll refer to my first post: Keep it simple.
__________________
'81 Sport Coupe 229 V6 -Junked
'93 Z28 LT1 - Parting out
"Is that a rat? No, it's just a really fat mouse."
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05-31-2007, 06:28 PM
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#9
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Join Date: Nov 2005
Location: Edison
Posts: 7,855
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all right ill just get the 1.5 ratio, I guess the springs will save me some money in the future when I go for a different solid cam. thanks alot guys,
edit
should I still check the piston to valve clearence if i go with 1.5?
__________________
1984 Firebird
2000 Z28
Last edited by WayFast84; 05-31-2007 at 06:28 PM.
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05-31-2007, 09:25 PM
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#10
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Join Date: Dec 2005
Location: Mount Holly, NJ
Posts: 242
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Quote:
Originally Posted by WayFast84
all right ill just get the 1.5 ratio, I guess the springs will save me some money in the future when I go for a different solid cam. thanks alot guys,
edit
should I still check the piston to valve clearence if i go with 1.5?
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You should be fine.
__________________
'81 Sport Coupe 229 V6 -Junked
'93 Z28 LT1 - Parting out
"Is that a rat? No, it's just a really fat mouse."
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