going from a 1.7 to a 1.75 comp rocker?
03-24-2006, 03:51 PM
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going from a 1.7 to a 1.75 comp rocker? I am doing a H/C swap on my car and I was told to use an adjustable rocker arm set up to get all the lifter preloads set correctly. Due to differant ptv clearances on each cylinder.
Well I found a used set of comp pro magnums that are 1.75 ratio is the FS section and was wondering the differance in ptv clearance with running the 1.75.
The cam is a 591/601 lift. Do I divide the lift by the 1.7 and then multiply 1.75.
If so my new lift would be 608/618 is this correct.
If so, I may have to flycut a little more on the intake valves. as I only have .080" right now with the stock rockers.
Well I found a used set of comp pro magnums that are 1.75 ratio is the FS section and was wondering the differance in ptv clearance with running the 1.75.
The cam is a 591/601 lift. Do I divide the lift by the 1.7 and then multiply 1.75.
If so my new lift would be 608/618 is this correct.
If so, I may have to flycut a little more on the intake valves. as I only have .080" right now with the stock rockers.
03-24-2006, 05:08 PM
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Originally Posted by WhiteRhino
Yep,your math is correct.As far as fly cutting I dont know.
03-24-2006, 06:53 PM
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JR
What's involved in installing these rockers? Several aftermarket rockers require that you use valve cover spacers or do some grinding on the covers. Are these going to require any modifing to run?
BTW, If you decide not to use them, I've been looking for a set for a few weeks.
What's involved in installing these rockers? Several aftermarket rockers require that you use valve cover spacers or do some grinding on the covers. Are these going to require any modifing to run?
BTW, If you decide not to use them, I've been looking for a set for a few weeks.
03-24-2006, 07:30 PM
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Originally Posted by BOTTLE ROCKET
JR
What's involved in installing these rockers? Several aftermarket rockers require that you use valve cover spacers or do some grinding on the covers. Are these going to require any modifing to run?
BTW, If you decide not to use them, I've been looking for a set for a few weeks.
What's involved in installing these rockers? Several aftermarket rockers require that you use valve cover spacers or do some grinding on the covers. Are these going to require any modifing to run?
BTW, If you decide not to use them, I've been looking for a set for a few weeks.
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03-25-2006, 02:28 AM
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Originally Posted by Unaffiliated Racing
No spacers.....just a bit of clearencing inside the valve cover.
I can handle a little bit of that.
03-25-2006, 06:16 AM
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you will have to clearance the valvecovers...no matter what the ads say..
Call comp to get recommended preload. usually .008-.010" cold using a dial indicator...but i dont know you lifter.
Call comp to get recommended preload. usually .008-.010" cold using a dial indicator...but i dont know you lifter.
