lq4 swap to flat top's with 243's?
#1
lq4 swap to flat top's with 243's?
i have a fresh lq4 bottom end had redone about a year ago still on the engine stand, my pain is to rob my heads and cam thats in my ls6 that im pulling out of my car heads are redone never ran the cam is 227/234 .614"/.576" 113+2 (btr stg 2 ls1-2) with about 10k on it heads are TSP PRC 2.5 243's only milled very little to clean up
this is for my 04 rcsb 4l80e swapped 3.42 gear, thinking about swapping the pistons out for GM lq9 flat top wondering about compression since its a daily. what would compression be? to high for 91-93 octane?
at this point its a couple hundred bucks and my labor is it a bad idea what do you all thing?
this is for my 04 rcsb 4l80e swapped 3.42 gear, thinking about swapping the pistons out for GM lq9 flat top wondering about compression since its a daily. what would compression be? to high for 91-93 octane?
at this point its a couple hundred bucks and my labor is it a bad idea what do you all thing?
#2
TECH Veteran
iTrader: (5)
All the alphabet soup around here I forget a lot of ****
but the rods from 4 to 9 are different. 4s are press fit and 9s are floating. I don't think you can use off the shelf 9 pistons
you can get hypers in a flat top 4.00 for a press rod tho
compression will be 10.9 ish. You're building an iron LS2, nothing magical here except the rod issue
but the rods from 4 to 9 are different. 4s are press fit and 9s are floating. I don't think you can use off the shelf 9 pistons
you can get hypers in a flat top 4.00 for a press rod tho
compression will be 10.9 ish. You're building an iron LS2, nothing magical here except the rod issue
The following 2 users liked this post by arthursc2:
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#7
Probably easier to just buy pistons for the press fits... and by the prices people ask for used trash be cheaper too. New flat tops from even summit can be had for around or under $200...You don't need the floating pin rods for some N/A build. You are probably 10.1 or 10.2:1 compression where you are now with the stock pistons. I would just do the heads and cam as is and leave the bottom end alone being its fresh.
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#9
TECH Fanatic
iTrader: (16)
Did you check to see if it has the newer rods? You would be at around 10.9:1, basically an Iron LS2.....I did this same setup recently, took an L96, swapped in some oem LQ9/LS2 pistons and added some 243 heads and the Summit Stage 1 High Lift truck cam and it runs great, torque is excellent right off idle