hello all, I have already built this. this is not a I wanna do this and then do this and then do this thread. it is already done. first read the carcraft.com ls 5.3 cam dyno article. they took a bone stock lm7 5.3 and dynoed it with various cams and printed the results. according to the article the stock 5.3 with dish pistons, and only 9.4:1 compression with a ls2 cam made 403hp.
first off... this is not by any means the only way to make 400-425 reliable hp on pump gas in a 5.3. you could use different heads, different cams, power adders, etc. but this worked for me.
my build; low mile 2005 l33 5.3 aluminum longblock. stock these have the flat top pistons and 243 heads, 9.9:1 compression, already a good start. then I stuck in a ls2 cam and springs. a ls6 intake with ported throttle body and the flex fuel injectors 35lbs. installed a pair of stainless steel headers, and a nice tune. this is in a 2280lb car with a 5 speed. it is a rocket, superbike on four wheels kinda rocket... on pump gas and didn't break the bank building it.
I have about $1750.00 in the motor. and I can very very conservatively say it makes 400+hp at the crank. more likely around 425-430chp. if the stock 5.3 make 403chp with the ls2 cam then the l33 with mods will definitely do that and then some.
again, by no means is this the only way to get 425hp from a 5.3 but it is a cheap and viable way and not break the bank. but this recipe could help others... have fun and happy motoring.
parts list dollar breakdown; l33/243 longblock with 8k miles was 600.00 back before these were popular. 12k mile oem ls2 cam and springs 150.00, ls6 intake 300.00, ebay .080 pushrods 85.00, arp rod bolts 90.00, ebay 8740 headstuds 68.00, oem gm new bearings, gaskets, seals, and timing set 190.00, lq9/flex fuel injectors 50.00, 78mm ported oem throttle body 65.00, truck 85mm maf 35.00, ebay stainless headers 195.00, made my own stand alone harness 0.00
first off... this is not by any means the only way to make 400-425 reliable hp on pump gas in a 5.3. you could use different heads, different cams, power adders, etc. but this worked for me.
my build; low mile 2005 l33 5.3 aluminum longblock. stock these have the flat top pistons and 243 heads, 9.9:1 compression, already a good start. then I stuck in a ls2 cam and springs. a ls6 intake with ported throttle body and the flex fuel injectors 35lbs. installed a pair of stainless steel headers, and a nice tune. this is in a 2280lb car with a 5 speed. it is a rocket, superbike on four wheels kinda rocket... on pump gas and didn't break the bank building it.
I have about $1750.00 in the motor. and I can very very conservatively say it makes 400+hp at the crank. more likely around 425-430chp. if the stock 5.3 make 403chp with the ls2 cam then the l33 with mods will definitely do that and then some.
again, by no means is this the only way to get 425hp from a 5.3 but it is a cheap and viable way and not break the bank. but this recipe could help others... have fun and happy motoring.
parts list dollar breakdown; l33/243 longblock with 8k miles was 600.00 back before these were popular. 12k mile oem ls2 cam and springs 150.00, ls6 intake 300.00, ebay .080 pushrods 85.00, arp rod bolts 90.00, ebay 8740 headstuds 68.00, oem gm new bearings, gaskets, seals, and timing set 190.00, lq9/flex fuel injectors 50.00, 78mm ported oem throttle body 65.00, truck 85mm maf 35.00, ebay stainless headers 195.00, made my own stand alone harness 0.00
