Lift ??

fogged306 · February 11th, 2008, 08:59 PM

Is there a formula or a website that can tell me what the difference in lift on a cam would be between 1.6 rockers and 1.7's?

I have a cam with a lift of .498 with a 1.6 and I need to know what that would be with a 1.7.

notchabovechevy · February 11th, 2008, 09:15 PM

not sure about the formula but I found this ay another site......................Considering you're adding those particular heads, you should be able to use the 1.7's. The specs for the B303 with a 1.6 rocker is .480 gross valve lift. The same cam with a 1.72 rocker will then be .516 lift. The stock 1991 pistons have 4 valve eyebrow reliefs and can accomodate approximately .535 lift. You should be ok but check piston to valve clearance before starting the car. While at it, check the length of the pushrod too, make sure you get the proper length to maintain valvetrain geometry.

fogged306 · February 11th, 2008, 09:20 PM

That works for me.. I just needed an estimate anyway. I am selling my e-303 to someone and they have 1.7's and needed to know the approx. lift.
Thanks

notchabovechevy · February 11th, 2008, 09:28 PM

no problem

JBIGBOOTSY · February 11th, 2008, 11:07 PM

take gross lift with 1.6rr, divide lift by 1.6, then multiply that number by 1.7

February 11th, 2008, 08:59 PM	#1
fogged306 Hardcore Enthusiast 89 GT Join Date: Apr 2007 Location: Happy? Posts: 1,273	Lift ?? Is there a formula or a website that can tell me what the difference in lift on a cam would be between 1.6 rockers and 1.7's? I have a cam with a lift of .498 with a 1.6 and I need to know what that would be with a 1.7.

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February 11th, 2008, 09:15 PM	#2
notchabovechevy Regular Join Date: Nov 2007 Location: South Carolina Posts: 398	not sure about the formula but I found this ay another site......................Considering you're adding those particular heads, you should be able to use the 1.7's. The specs for the B303 with a 1.6 rocker is .480 gross valve lift. The same cam with a 1.72 rocker will then be .516 lift. The stock 1991 pistons have 4 valve eyebrow reliefs and can accomodate approximately .535 lift. You should be ok but check piston to valve clearance before starting the car. While at it, check the length of the pushrod too, make sure you get the proper length to maintain valvetrain geometry.

February 11th, 2008, 09:20 PM	#3
fogged306 Hardcore Enthusiast 89 GT Join Date: Apr 2007 Location: Happy? Posts: 1,273	That works for me.. I just needed an estimate anyway. I am selling my e-303 to someone and they have 1.7's and needed to know the approx. lift. Thanks

February 11th, 2008, 09:28 PM	#4
notchabovechevy Regular Join Date: Nov 2007 Location: South Carolina Posts: 398	no problem

February 11th, 2008, 11:07 PM	#5
JBIGBOOTSY Hardcore Enthusiast 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 2,064	take gross lift with 1.6rr, divide lift by 1.6, then multiply that number by 1.7

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