TurboRust Posted May 31, 2016 Report Share Posted May 31, 2016 Trying to help advise a friend on a swap. Looking to stay n/a and as much compression as possible with e85. Tea stg 2 ported 5.3 heads bored out to 3.905 or 3.910 to get near a 5.7. Can this be done with just pistons on the stock 5.3 rods and recommend a cam for some power in a light car with a t56. Once again never will be boosted at all just looking to make 400ish whp with heads cam c Bored out and not going to a stroker kit. Thanks yall Quote Link to comment Share on other sites More sharing options...
Chadz89GTA Posted May 31, 2016 Report Share Posted May 31, 2016 Stock ls1 bore was 3.898, I have a 5.3 in the garage hats punched to that with stock pistons and rods. Been that way for three years now and made 400hp with cam and ls6 intake. Mods in sig Quote Link to comment Share on other sites More sharing options...
Pntbll309 Posted May 31, 2016 Report Share Posted May 31, 2016 Do you have your heads purchased yet? I have some PRC 2.5 5.3L heads with .675'' springs and all the other goodies. I need bigger heads on my 408. Either way, a punched out 5.3 with a cam and decent heads should have no issue hitting the 400whp mark. What intake manifold are you going to be running? If you want high compression youll be limited on cam size unless you do some type of valve relief. Quote Link to comment Share on other sites More sharing options...
Cordell Posted June 1, 2016 Report Share Posted June 1, 2016 The rods are basically the same, so to answer your questions, yes it'll work. Obviously it should be rebalanced. I would try to stay with a stock LS1 bore of 3.898, or close to it. Some people have reported getting close to the coolant jacket on some blocks. I have never done it, but I wouldn't want to create a cooling issue. Quote Link to comment Share on other sites More sharing options...
Chadz89GTA Posted June 1, 2016 Report Share Posted June 1, 2016 Should also be noted that the EARLY 5.3 blocks were the same as the 6.0 blocks and can be bored to that, but sonic checking is your friend there Quote Link to comment Share on other sites More sharing options...
TurboRust Posted June 1, 2016 Author Report Share Posted June 1, 2016 (edited) chad did you go with just stock ls1 pistons and rods or use 5.3 rods and 5.7 pistons(5.3 rods "look" so much beefier) and for this going in an is300 and staying as a fun street car more than doubling the whp of its current state so getting to the 5.7 displacement is fine probably an ls6 intake if a fast doesn't pop up cheap during the build Edited June 1, 2016 by TurboRust Quote Link to comment Share on other sites More sharing options...
TurboRust Posted June 4, 2016 Author Report Share Posted June 4, 2016 soooo what kinda of compression ratio will we end up with 5.7 flat top pistons flycut and 5.3 heads Quote Link to comment Share on other sites More sharing options...
Chadz89GTA Posted June 4, 2016 Report Share Posted June 4, 2016 Used stock pistons and rods out of a trans am, using an fbody crank since its gun drilled. The cost per hp for me to get a fast wasn't in the budget since I already had a shaner s2 throttle body and the ls6 intake sitting around. I've been beating on t with ls6 rod bolts for four years and man hard hard miles and it just goes everytime I turn the key lol Quote Link to comment Share on other sites More sharing options...
TurboRust Posted June 4, 2016 Author Report Share Posted June 4, 2016 Planned on having it lightened and balanced by m&m during the build.. the 5.3 rods look so much beefier I think it's in his budget to go with new pistons so some flat tops were my thought to bump compression since it'll stay n/a the whole time Quote Link to comment Share on other sites More sharing options...
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