Magic Stick 3 base circle? Needed pushrod length?
Magic Stick 3 base circle? Needed pushrod length? I'm looking for confirmation on my measurement of the base circle of the TSP MS3 cam- I got a base circle that is a whopping .13015" smaller than stock.
Can anyone confirm this?
With a head shaved .040" and a headgasket @ .040" thickness, I've calculated that I'll need 7.366" pushrods (assuming a stock length of 7.380").
Can anyone confirm this?
Thanks
Ben
Can anyone confirm this?
With a head shaved .040" and a headgasket @ .040" thickness, I've calculated that I'll need 7.366" pushrods (assuming a stock length of 7.380").
Can anyone confirm this?
Thanks
Ben
I think I went in the wrong direction- the base circle is smaller than the amount shaved so I need to ADD the difference to the length of the stock pushrods. Sound correct?
Here is the math:
base circle = .13015" smaller
.065075" smaller radius
head is .052" closer vs. stock. It is shaved .040" and headgasket is .012" closer vs. stock headgasket
.065075" (smaller base circle) - .052" (distance moved closer to cam) = .013075" longer pushrod needed
7.8000 (stock pushrod length) + .013075" (to make up difference between base circle and new rocker height) = 7.813075" (new pushrod length)
It looks like a need 7.8125" pushrods?
Thanks
Ben
Here is the math:
base circle = .13015" smaller
.065075" smaller radius
head is .052" closer vs. stock. It is shaved .040" and headgasket is .012" closer vs. stock headgasket
.065075" (smaller base circle) - .052" (distance moved closer to cam) = .013075" longer pushrod needed
7.8000 (stock pushrod length) + .013075" (to make up difference between base circle and new rocker height) = 7.813075" (new pushrod length)
It looks like a need 7.8125" pushrods?
Thanks
Ben
Originally Posted by RX-Ben
I'm looking for confirmation on my measurement of the base circle of the TSP MS3 cam- I got a base circle that is a whopping .13015" smaller than stock.
Can anyone confirm this?
With a head shaved .040" and a headgasket @ .040" thickness, I've calculated that I'll need 7.366" pushrods (assuming a stock length of 7.380").
Can anyone confirm this?
Thanks
Ben
Can anyone confirm this?
With a head shaved .040" and a headgasket @ .040" thickness, I've calculated that I'll need 7.366" pushrods (assuming a stock length of 7.380").
Can anyone confirm this?
Thanks
Ben
I've heard that, but I've also heard that they are 7.380
https://ls1tech.com/forums/showthrea...pushrod+length
Thanks
Ben
https://ls1tech.com/forums/showthrea...pushrod+length
Thanks
Ben
Originally Posted by LS198TA
stock pushrods are 7.400 i have milled heads and im running comp cams 7350s
Originally Posted by RX-Ben
I think I went in the wrong direction- the base circle is smaller than the amount shaved so I need to ADD the difference to the length of the stock pushrods. Sound correct?
Here is the math:
base circle = .13015" smaller
.065075" smaller radius
head is .052" closer vs. stock. It is shaved .040" and headgasket is .012" closer vs. stock headgasket
.065075" (smaller base circle) - .052" (distance moved closer to cam) = .013075" longer pushrod needed
7.8000 (stock pushrod length) + .013075" (to make up difference between base circle and new rocker height) = 7.813075" (new pushrod length)
It looks like a need 7.8125" pushrods?
Thanks
Ben
Here is the math:
base circle = .13015" smaller
.065075" smaller radius
head is .052" closer vs. stock. It is shaved .040" and headgasket is .012" closer vs. stock headgasket
.065075" (smaller base circle) - .052" (distance moved closer to cam) = .013075" longer pushrod needed
7.8000 (stock pushrod length) + .013075" (to make up difference between base circle and new rocker height) = 7.813075" (new pushrod length)
It looks like a need 7.8125" pushrods?
Thanks
Ben
If stock is 7.38 and you need to add .013, you'd need a 7.393. You should be OK with a 7.400 since the hydraulic lifters compensate a bit for the added length.
Hmm...I have no idea where I pulled 7.8 from. In any case, 7.38 is what I meant to put there. 7.4s sound good to me too.
Ben
Ben
Originally Posted by BADFNZ
I still don't see where you're getting 7.800 from.
If stock is 7.38 and you need to add .013, you'd need a 7.393. You should be OK with a 7.400 since the hydraulic lifters compensate a bit for the added length.
If stock is 7.38 and you need to add .013, you'd need a 7.393. You should be OK with a 7.400 since the hydraulic lifters compensate a bit for the added length.
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Originally Posted by RX-Ben
Hmm...I have no idea where I pulled 7.8 from. In any case, 7.38 is what I meant to put there. 7.4s sound good to me too.
Ben
Ben
matt
I have 2 lifters that leaked down (they are completely soft) and the others are still pumped up (very hard, I can't squeeze them by hand). Can I use the "hard" ones with the adjustable pushrod?
Thanks
Ben
Thanks
Ben
Originally Posted by muraoka
7.8 is stock length for gen1 blocks. the easiest way to check length is to get an adjustable pushrod. assemble the rockerarm and adjust the pushrod till the rocker is centered on the valve stem. pull out the pushrod and measure it.
matt
matt
Thanks guys. I already have the adjustable push rod, I'm just waiting for my modded LS1 rockers to come back from Harland Sharp. The bearing mod has taken over a month for them to do.
Ben
Ben
