I'm looking at converting my lt1 with 100,000 miles on it to an lt4 with the hot cam. Summit racing has the lt4 conversion kit on there site so I was thinking about getting that kit. Is there anything else I would need for the conversion and also then conversion would be the same basically as a rebuild right? Just some questions I needed answered. Thanks

 

No, it wouldn't be the same as a rebuild... you're not touching the "bottom end" - pistons, rings, rods, crank, bearings, etc. It would be the same as "rebuilding" the heads... valve job, new springs, rockers, guides, etc.

You will need a computer reprogram, an upgraded exhaust system, and some people go to a 52mm TB.

 

well thanks for the info. I have hooker lt's and y pipe plus slp loudmouth will that work with the convert lt1 to lt4 or will i still need new exhuast plus I already have a 52mm throttle body.

 

LT's are fine.

Suggestion - Include all the info about your car in the original post, so people can give you the correct info without guessing. Most people include basic info, including major mods, in a "signature" field.

 

Sorry bou tthat but I don' post my mods in my sign for other reasons i care not get into. Anyways its basically a stock 95 lt1 with 3.42's custom pcm, 160 thermostat, lt's with y pipe and slp LM exhaust. 52 mm throttle body and slp cold air intake.

 

I also did the LT4 conversion and put 30 lbs injectors in. LT4 production cars came with 28 lbs.

 

I think its a waste of money. Port the stock heads and do the hot cam if you wish, I would personally do a different cam. people have good luck with cc308 i believe is the grind number

 

They said with my mods and a lt4 upgrad I would be pushing about 450 horses. Is that about right? Or what should I expect?

 

That is a slightly inflated (wishfull) Flywheel HP rating.

Just wanted to make sure you understood they are talking flywheel and not the rear wheels.

 

so what kind of rwhp should i expect if i do that with the mods i have and about what 1/4 time should i expect?

 

Probably looking at around 370 rwhp depending on your trans. You'll get more to the ground with a M6 then the A4, you said you have 3.42's so I'm guessing M6? Mid 12's I would say in the 1/4.

 

Actually I have 3.42's for a 2 series carrier. I'm running 12.9 with just the mods I have now on my car so mid 12's seams a lil high to me. Are you sure thats all i'll run? and 375 wrhp? I was hoping more like 400.

 

Nothing against the LT-4 conversion kit, but I would think your money would be better spent on a 306 and ported heads. You'll get a lot more bang for your buck than the conversion kit imho.

 

What tires are you running?

 

Um I am running 450 nitto on the front an 555 drag radials on the back. No slicks. Why would that make a difference?