Different exhaust/intake lifter preload. Any harm?
Different exhaust/intake lifter preload. Any harm? Hello,
Upon machine work on my 243 heads, and moving from stock lifters to morel 5290's I now have two different pushrod measurements.
Intake = 7.247
Exhaust = 7.236
I'm thinking of running 7.275 pushrods with a resulting preloads of .028 and .039.
Any harm in having 2 different preload values?
Upon machine work on my 243 heads, and moving from stock lifters to morel 5290's I now have two different pushrod measurements.
Intake = 7.247
Exhaust = 7.236
I'm thinking of running 7.275 pushrods with a resulting preloads of .028 and .039.
Any harm in having 2 different preload values?
As long as you are in the preload spec range of the lifter then you are fine. That being said I have seen it mentioned that a engine with the same preload across all lifters makes for a more responsive motor. Not sure how much tuth there is to that but I figured I would mention it.
I have 2 different preload measurements going on with my engine as well. I am thinking about going back through it again and getting different length push rods to close the difference so its less then .005. Right now I am about .015 difference.
I have 2 different preload measurements going on with my engine as well. I am thinking about going back through it again and getting different length push rods to close the difference so its less then .005. Right now I am about .015 difference.
I was doing this measurement on the cylinder that had my "checker" Springs installed. I moved to a cylinder that has my prc .650 duals installed and re measured. I came up with. 7.260. With both intake and exhaust being close to one another. Repeated the process on the other bank. Same measurements , right around 7.260. Something with the checker springs was screwing up the measurements. Lesson learned.
As long as you are in the preload spec range of the lifter then you are fine. That being said I have seen it mentioned that a engine with the same preload across all lifters makes for a more responsive motor. Not sure how much tuth there is to that but I figured I would mention it.
I have 2 different preload measurements going on with my engine as well. I am thinking about going back through it again and getting different length push rods to close the difference so its less then .005. Right now I am about .015 difference.
I have 2 different preload measurements going on with my engine as well. I am thinking about going back through it again and getting different length push rods to close the difference so its less then .005. Right now I am about .015 difference.
