Best pushrod dia for my build
Best pushrod dia for my build Alrighty I'm currently putting together my motor, here's the specs:
02 5.7 stock bottom end
243's full cnc porting 226cc by AI, milled to 61cc
226/234 113 LSA 600/600
Stock rockers with trunnion upgrade
Ls7 lifters
BT springs
Ls6 manifold
Should manage around 440-460 rwhp
I measured with the pushrod checker last night and I'm going with 7.300 length pushrods. I get 4130 chromemoly 5/16 x .080 wall thickness pushrods with my order from Ai but read where a larger dia pushrod is much more robust for valve geometry. Is going to a 11/32 dia or 3/8 dia worth the extra cost or is it overkill for my motor? I'll probably take the car to the strip a couple times a year.
I could have had them open up the hole for more clearance but wasn't aware of the larger pushrod dia at the time.
I want to order them tomorrow so quick opinions are much appreciated
02 5.7 stock bottom end
243's full cnc porting 226cc by AI, milled to 61cc
226/234 113 LSA 600/600
Stock rockers with trunnion upgrade
Ls7 lifters
BT springs
Ls6 manifold
Should manage around 440-460 rwhp
I measured with the pushrod checker last night and I'm going with 7.300 length pushrods. I get 4130 chromemoly 5/16 x .080 wall thickness pushrods with my order from Ai but read where a larger dia pushrod is much more robust for valve geometry. Is going to a 11/32 dia or 3/8 dia worth the extra cost or is it overkill for my motor? I'll probably take the car to the strip a couple times a year.
I could have had them open up the hole for more clearance but wasn't aware of the larger pushrod dia at the time.
I want to order them tomorrow so quick opinions are much appreciated
What type of usage with the engine see, how high to you plan on spinning the motor?
You'll free some power on the top-end(? hp), but with the fairly mild lobes on that AI cam I couldn't see going any larger than 11/32" PRs..
You'll free some power on the top-end(? hp), but with the fairly mild lobes on that AI cam I couldn't see going any larger than 11/32" PRs..
Last edited by 99Bluz28; Aug 6, 2014 at 09:10 PM.
11/32 wouldn't hurt anything. The added weight is lifter side, so you can absorb the weight there without it affecting harmonics. It will fight off lifter loft better as the pushrod will be less likely to flex at higher RPMs.
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Go with the largest outside diameter that will fit. Unless you run them back to back you won't know what difference it makes. Also, its not about hp, its about valve train stability. Made a big difference in my setup. You can get the 11/32" very quickly from Manton pushrods. Here is a write-up I did on mine some time back: Link to Pushrod Stiffness
Go with the largest outside diameter that will fit. Unless you run them back to back you won't know what difference it makes. Also, its not about hp, its about valve train stability. Made a big difference in my setup. You can get the 11/32" very quickly from Manton pushrods. Here is a write-up I did on mine some time back: Link to Pushrod Stiffness
Go with the largest outside diameter that will fit. Unless you run them back to back you won't know what difference it makes. Also, its not about hp, its about valve train stability. Made a big difference in my setup. You can get the 11/32" very quickly from Manton pushrods. Here is a write-up I did on mine some time back: Link to Pushrod Stiffness