I pose this question to those of you that have the kit installed on there car. Is this kit worth the 2600 dollar price that they ask for it? How do you like it? Does it really put out the claimed 425Hp??? Thanks in advace for you replys guys, John

 

lots of research has been done and a lot of posts made concerning the LT4 conversion....try the search function

 

I try that, but most of the post were people TALKING about doing it. I would like to hear for persons that have REAL WORLD info to share, not "lounge chair" racers. Thanks, John

 

Well I can tell you that it's not worth the money....and the 425 hp (if you're lucky) is flywheel...not rw....

The stock LT4 heads flows MUCH better than a stock LT1 head. Stock LT1's flow about 215/150 and have about a 170 cc intake runner. If you decide to port, they will be flow about 265 cfm with a 195 cc intake port or 275 cfm with a 205 cc intake runner.

A 350 cubic inch motor turning 6200 would be fine with a 195 cc port. Anything larger and the car will not accelerate as well and will make less HP. The 205 cc intake port is best for 6800 RPM 350's that do not need as much low end torque or ANY 383 cubic inch motor. These extra cubic inches will eat up runner volume and allow a larger runner volume to be used.

IMO, your money can be spent more wisely in the porting of your stock LT1 heads and the addition of a cam and valvetrain to support. You'll see better hp/torque gains...

 

Thank you . How would the AFR's Or Canfields be? Cam wise Something streetable ( My Daily driver ) and smog friendly. From what I have been reading thr LT4 intake suck *** too...

 

Also, Summit sells the complete LT4 kit now for around $2100.