Limits of a 5.3L iron block? (LM7)
Thread Starter
Launching!
Joined: Sep 2005
Posts: 223
Likes: 1
From: Dayton, Ohio
Limits of a 5.3L iron block? (LM7) I believe I'll be looking for a 5.3 truck engine to swap into a second gen RX7(with Fbody oilpan, intake, and accessories of course), and was just wondering how limited you would be giving up those extra .4 liters?
I've heard that just putting a Z06 cam in there would yield stock-like drivability but an extra 40+hp on the top end... sounds good, but how much could you squeeze out by shaving a bit off the heads and/or using thinner gaskets to bump C/R, along with a mild port/polish job?
I'd like to attain 350rwhp with the ability to dump a 100 shot of nitrous on it later down the road.
I've heard that just putting a Z06 cam in there would yield stock-like drivability but an extra 40+hp on the top end... sounds good, but how much could you squeeze out by shaving a bit off the heads and/or using thinner gaskets to bump C/R, along with a mild port/polish job?
I'd like to attain 350rwhp with the ability to dump a 100 shot of nitrous on it later down the road.
. I can tell you that with 115K on a 2001 5.3L with a 4l60e trans and a 8.5" rear end you should have 253Hp at the wheels. 
