posted March 28, 2004 08:15 AM
What is the purpose of long push rods? What type of circumstances would you use them? I could maybe understand shorter push rods from milling block and heads, but longer?
posted March 28, 2004 09:01 AM
IF YOUR HEADS DON'T GET MACHINED RIGHT FOR SCREWIN STUDS THEN YOU WILL PROBLAY NEED LONGER P-RODS JUST A GUESS I DO KNOW THAT IT HAS A LOT TO DO WITH GEOMENTRY
posted March 28, 2004 10:25 AM
One of the biggest reasons for longer pushrods is longer valves. Stock SBC installed height is around 1.650"-1.700". That doesn't give alot of space for a performance spring. A .100" longer valve will give an installed height around 1.800" that opens up the spring selection a whole bunch.
posted March 29, 2004 04:16 PM
Get the pushrod checker and check every engine for sure. It is cheap insurance if nothing else. We ran one that needed longer rods and we had the stock ones. We bent a push rod for 3 weeks in a row, then once we found the problem the valve guides was wasted because the increased angle actually pushed the valve back instead of down. Expensive lesson to learn when a few bucks up front would have saved it all. Never seen hydraulics need longer but always check anyway to be safe. Most of all it takes 10 seconds to check it and is super simple to figure out the sizze you need.
posted March 30, 2004 04:42 PM
We ran a solid cam with long slot rockers and needed .200 longer, switched to roller rockers and had to go back to stock length.