OxTheGreat

Hey guys, been crunching numbers lately planning out my 5.3 JY build. Since im new at this i wanted to post what ive got so far and see what you all think.

•2000 5.3 LM7
•Summit racing 5.3L iron block (im doing this to expidite build time and machining costs)
•317 heads that will retain factory valves, roller lifters, rockers and push rods
​​​​​​•comp cam rocker trunion kit
•valve springs will be replaced with duel spring. Not sure which brand
• comp cam 281LR HR13 cam 281/289 .617/.624 lsa 113
•Summit racing 4.8 engine rebuild kit with speed pro flat top hypereutectic pistions pn 08-0068
•scat pro i beam rods pn 2-1CR6100-927
•80+ lbs injectors, undecided amount or brand
​​​​​​•turbo system, undecided of size or if going twins
​​​​​​•pro glide 1.80 1200hp rating
•ford 9" with undecided gearing
•MSD 2 step

This is a DRAG ONLY car, so if you see places i can improve please let me know

OxTheGreat

No inputs?

KCS

iTrader: (20)

Rods won't work. Wrong pin size.

OxTheGreat

touche

OxTheGreat

would a rod with .945 pin hole work with the .943 pin hole on piston? Or does the tolerances need to be tighter?

OxTheGreat

Any other input?

KCS

iTrader: (20)

According to summit, the piston is for a .945" pin and a press fit (non-bushed) rod:

https://m.summitracing.com/parts/slp-h855cp

With that setup, the piston should be looser for clearance and the rod should be tighter for a press fit. This is the rod you would use:

https://m.summitracing.com/parts/sca-26100944p

Don't forget that summit will price match...

OxTheGreat

Tracking! Now the questions rises, is a press fit pin better than a floating? I always heard floating pins were the bees knees. However your match up yielded lower build cost.
Press < floating
I beam < h beam

KCS

iTrader: (20)

Not really, the floating pin is just easier to assemble. The press fit rods and pistons have to go to a machine shop to be assembled.