pushrods?
07-18-2009, 03:46 PM
#2
Are you using SA or non-SA rockers? If you're running non-SA rockers, you need hardened pushrods and guideplates. Stock length pushrods are 7.20" 5/16" rods. If you're reusing stock lifters and the heads have never been off, you can use 7.20" rods. If the deck height, head gasket, or head volume (due to milling) you need to measure for proper length.
07-18-2009, 04:05 PM
#4
im not sure on the rockers i just bought them and on the webpage it doesnt tell you what they are but ill call them monday.the cc# is 1318-16 if anyone out there knows. im going to take off the heads to do a valve job on them and a mill prob but how do you measure them?
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07-18-2009, 04:46 PM
#8
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the 1318-16 is a self aligning roller tip rocker, you can get away without using the hardened pushrods and like it was said earlier in the thread...if the heads have not been off and the deck height has not changed than you can go ahead and use 7.200 inch pushrods but if you so much as changed the head gasket to a thinner one than I would check the length.
07-18-2009, 08:06 PM
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If you mill the heads you are going to have to check pushrod length, you need the geometry to be spot on if you are going to get the most from that cam
07-19-2009, 01:49 AM
#13
any time the heads, block have been milled or head gasket thickness changes...length of PR is effected.
7.20" is stock and will "work" with about any change but NOT be spot on if you have made the changes noted. valve guide wear and high RPM issues will be the result of bad valve train geometry or...BOOM is some cases.
get a PR check tool for about $12 and measure. Most PR companies make them in .025 incriments...so if you ned a 7.150" 0r 7.100" (generally the size after mentioned mods) they make that size.
You can "custom" order any length but not necessary to order a 7.023" when a 7.00" will work.
7.20" is stock and will "work" with about any change but NOT be spot on if you have made the changes noted. valve guide wear and high RPM issues will be the result of bad valve train geometry or...BOOM is some cases.
get a PR check tool for about $12 and measure. Most PR companies make them in .025 incriments...so if you ned a 7.150" 0r 7.100" (generally the size after mentioned mods) they make that size.
You can "custom" order any length but not necessary to order a 7.023" when a 7.00" will work.
07-25-2009, 04:59 PM
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Most times, even decking the block or surfacing the heads won't make that much of a difference to call for a different length pushrod BUT it's always a good idea to measure just to be sure.
There are a lot of different pushrods made that fit the 5/16"-7.200" spec, it's just that some types are better than others. Prices vary a lot too.
Most times you'll find that pushrods come in different lengths in .050 increments. For example, stock rods are 7.200 next one's longer are 7.250", etc. The reverse is true when going shorter in length; 7.200" then 7.150, etc.
"Ole Racer's" rule of thumb is it's better to use pushrods that are little too long than ones that are are little too short.
I use TrickFlow pushrods made of 4130 chrome-moly steel with .080" thick walls, they are one piece (NOT having welded-on ends/*****) and are hardened for wear resistance. Those are the specs you should be looking for in a pushrod.
TrickFlows' cost is very reasonable, too, as compared to those offered by CompCams, etc.
Just my thoughts.
Jake
West Point ROCKS!
