speedgarage

Hi guys, working on building up a 5.3 and an LSA supercharger and working on the internals. I've done a lot of searching and it seems to be the way to go but wanted to confirm.

​​​​​​-5.3 with 4.8 pistons to bump the compression
-243 heads
-ls9 cam to keep it on a budget

It seems to be a decent recipe but what are all your thoughts?

G Atsma

The compression should work IF you watch the boost. Looks good otherwise...

JoeNova

I scratch my head when people mention the LS9 cam.

G Atsma

Agreed; there are far better ones, even for supercharging.

Bspeck82

Jegs cams arent that pricey...like 280 bucks

tech@WS6store

iTrader: (2)

Ls9 cam is cheap...but it wont work in gen3 without spending about $150+ more anyway. so in the end its not cheap.
Jegs cams....yeah....

Id go with a smallish cam even with lsa. no need for such a wide lsa either. Hell even our hot cam would work well and doesnt need ls2 front cover etc etc. Cam and springs are $515 and just like ls9 cam it uses stock prs.

kingtal0n

iTrader: (1)

what spring- whats the pressure on 1218's compared to stock, compared to the next thing, isn't there a jpg yet? If not lets make one

it should show stock spring closed and open or whatever, then compare the aftermarkets and breakpoints for lifter upgrades (using solid roller ramp for example)

all the research I have done and still have not collected much data for gen3 oem-lifter compatible performance cams


whereas this is the ideal subject when boosting oem longblock 5.3 engines

tech@WS6store

iTrader: (2)

The issue with comparing any spring to the stock spring is the as published pressures for yellow vs blue ls6 springs is the "same" but they are different. I do not have that info BUT i will compile a list of the commonly used springs. Itll take about a week.
Per gm specs the ls6s are 90lb at 1.8 and 295 at 1.250 max lift .550 (adv)
1218 are 130 @1.8 and 318 @1.2 max lift .600 (adv)
1219x are 145 @1.8 and 358@1.175 max lift .625 (adv)

The X series rate changes a little vs the reg series.

ddnspider

iTrader: (26)

Definitely no ls9 cam on that motor. Put a triple12 in it and it'll drive like stock, sound good, and make more power.

speedgarage

Thanks guys for the input, I appreciate all the experience. Rather do the homework now than pay more later.

Joie_C

Get some gen 4 rods off eBay, gap those rings, and send it to mars.

cam

iTrader: (9)

LSA unit on cathedrals?

ddnspider

iTrader: (26)

They make adapter plates.