Clearance for 3/8 pushrods - LS3 heads
01-09-2012, 07:18 PM
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Clearance for 3/8 pushrods - LS3 heads I have searched, consensus seems to be that 3/8" pushrods fit with only minor work to clearance the holes. Does anyone have an image depicting where on the hole and approximately how much needs to be removed?
01-17-2012, 03:48 PM
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I cannot / did not measure the builds I have done. I use a flashlight and mock everything up, roll the engine thru a few cycles. Use a solid lifter to get full valve lift, or use a longer pushrod and find bottom of travel for a hydraulic lifter (if heads are already on engine).
Last one I checked there was at my estimation .050 all the way around a 3/8 .080 wall Trend pushrod, with heads that were unmodified in the pushrod area.
If it tickles the side of the aluminum a bit while running, like stated above...not a deal killer (but not a good idea if you can clearance it first).
If it binds up and you can't turn it over easily...obviously you need to drill the holes out a bit
Last one I checked there was at my estimation .050 all the way around a 3/8 .080 wall Trend pushrod, with heads that were unmodified in the pushrod area.
If it tickles the side of the aluminum a bit while running, like stated above...not a deal killer (but not a good idea if you can clearance it first).
If it binds up and you can't turn it over easily...obviously you need to drill the holes out a bit
01-18-2012, 08:39 PM
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I cannot / did not measure the builds I have done. I use a flashlight and mock everything up, roll the engine thru a few cycles. Use a solid lifter to get full valve lift, or use a longer pushrod and find bottom of travel for a hydraulic lifter (if heads are already on engine).
Last one I checked there was at my estimation .050 all the way around a 3/8 .080 wall Trend pushrod, with heads that were unmodified in the pushrod area.
If it tickles the side of the aluminum a bit while running, like stated above...not a deal killer (but not a good idea if you can clearance it first).
If it binds up and you can't turn it over easily...obviously you need to drill the holes out a bit
Last one I checked there was at my estimation .050 all the way around a 3/8 .080 wall Trend pushrod, with heads that were unmodified in the pushrod area.
If it tickles the side of the aluminum a bit while running, like stated above...not a deal killer (but not a good idea if you can clearance it first).
If it binds up and you can't turn it over easily...obviously you need to drill the holes out a bit
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01-24-2012, 12:21 PM
#9
You take that extra weight every time you get the chance and it will clear! The very minimal extra weight from thicker pushrods is better to have than extra deflection. Also, weight on that side of the rocker is far less vital than on the valve side.
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COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
