highest lift on stock valves
#1
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Car: 91 Camaro RS
Engine: 3.1L V6
Transmission: 700R4
Axle/Gears: Stock 3.23 open diff
highest lift on stock valves
I was reading somewhere about the highest lift you could read on the stock valve springs but I can't find that post anywhere. I am looking into a Comp Cam camshaft with .440" intake and exhaust lift. Would 1.6s be too much lift more the stock vavle springs? Should i bump down to 1.52s??
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Car: 91 Camaro RS
Engine: 3.1L V6
Transmission: 700R4
Axle/Gears: Stock 3.23 open diff
What spring would you use for the 1.6 rockers?? I do not want to pay to have my heads machined
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Car: 87 camaro(Temporary insanitee)
Engine: 2.8
Transmission: Non worldclass t-5
i am running .500 lift intake and .520 exhaust with 1.5 rockers and crane springs. if i can run .520 lift, you can run .440 lift with a little machine work. i am however thinking of going to 1.6 rockers but i believe that i am gonna need to split the valvecovers and i spent the last week painting the valvecovers all pretty and such.... really don't want to have to do more sanding and painting.
Last edited by wildponies3; 08-30-2005 at 08:19 AM.
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#8
Originally posted by DustyJL
could I run a .440" lift with a 1.6 rockers??
could I run a .440" lift with a 1.6 rockers??
.440"i/.440"e cam with 1.6 rockers instead of the 1.5's = .469"i/.469"e
And is about the max you can get and still be computer friendly with the MPFI at idling and vaccuum operation of the ECM.
I plan to ship my heads to Supersix along with my own springs and titanium seats & retainers for him to install onto the heads for me
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I think what he is askiing is what's the maximum lift you can have without coil bind or guide interference.
I understand your question, but don't have the answer
I understand your question, but don't have the answer
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Car: 87 camaro(Temporary insanitee)
Engine: 2.8
Transmission: Non worldclass t-5
i was just looking at them yesterday as a cheaper alternative to the crane springs but they won't support my cam, so i need their performance springs p/n 330585.<--- theese handle .560 lift
the stock springs part number is 10207475, and max lift is .420
unless it is a 3.4 and then it is 12363215, and it doesn't say about the max lift
hope this will help you, dusty
Shaun
the stock springs part number is 10207475, and max lift is .420
unless it is a 3.4 and then it is 12363215, and it doesn't say about the max lift
hope this will help you, dusty
Shaun
#16
Paul, I recall you saying you bought one of the new HT3.4's. That high output GM crate motor already has better valve springs installed onto it than the factory 2.8's that came in the HO heads on the 3rd gens.
That motor with the rockers it came with (1.5's) has a total overall lift of .427'i/.454"e
The springs that GM put into it are machine in at a closed height of1.70" and have a max open height of useage of 1.20" meaning they have an overall maximun lift usage of .500"
By putting 1.6 rocker onto the motor without any other changes you will get an overall lift of .455"i/.484"e.
YES, You can add them with the valve springs you currently have in the HT3.4. (Note: the '93-'95 Camaro 3.4 does not have these springs added, they have the same cam and springs as the '87 and up 2.8 & 3.1 motors)
That motor with the rockers it came with (1.5's) has a total overall lift of .427'i/.454"e
The springs that GM put into it are machine in at a closed height of1.70" and have a max open height of useage of 1.20" meaning they have an overall maximun lift usage of .500"
By putting 1.6 rocker onto the motor without any other changes you will get an overall lift of .455"i/.484"e.
YES, You can add them with the valve springs you currently have in the HT3.4. (Note: the '93-'95 Camaro 3.4 does not have these springs added, they have the same cam and springs as the '87 and up 2.8 & 3.1 motors)
#17
Originally posted by DustyJL
YEs Eric that is my question.
YEs Eric that is my question.
The max lift on fatory valve springs is in fact .420" and I am at .415"e right now with the stock cam and 1.52's
Search my old post labeled "Build sheet" under "AGood2.8" on what springs and retainers I plan to use for my build using that same cam and 1.6 rockers.
Last edited by V6#20; 09-14-2005 at 12:36 PM.
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Engine: 3.4lL 60* V6
Transmission: Tremic TKO 600 RR
Eric
That is correct I bought the HT 3.4 160 HP crate engine. I am sure you have seen my posts about it. Holley 390 4 brl. Edelbrock performa intake. Mallory Dizy. headers all this in a 1700 lbs. car. Again thank you to you and everyone else who gave input to my question. Once we get this all together I will let you know waht the tale of the Dyno.
Paul
That is correct I bought the HT 3.4 160 HP crate engine. I am sure you have seen my posts about it. Holley 390 4 brl. Edelbrock performa intake. Mallory Dizy. headers all this in a 1700 lbs. car. Again thank you to you and everyone else who gave input to my question. Once we get this all together I will let you know waht the tale of the Dyno.
Paul
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