uneek1976

I have a couple of questions and or opinions for you guys, I have a lq4 stock bottom end, 700r4 trans 3500 stall, 3.73 gear, headers, 750 carb, 231/237 @50, stock 243 heads. I don't have a manifold yet and I'm not sure if I need to get a single or dual plane manifold and I know that lq4's with 317's the compression like 9.5 but I don't know what it will be with the 243's so should I have my 243's milled or just leave them alone? My car is just a weekend cruiser that I will be taking to the track for some occasional runs as well. I also plan to plan to do some highway driving to various car shows, cruises, and tracks as well. Thanks in advance for any and all feedback because I'm edgar to learn something new.

speedtigger

iTrader: (16)

I did some testing. At the time, my car had a 3000 stall and weighed #3700+. The car ran harder with the Victor Jr over the Performer RPM. The 60' was about 3-5 hundredths quicker with the Performer RPM, but after that, the Victor Jr. was faster.

uneek1976

Speedtigger thank you for your input, 3-5 hundredths is not that much imo. Do you think I should leave the heads alone or have them milled?

speedtigger

iTrader: (16)

Depends on the rest of the specs on that cam. What is the ICL and LSA?

uneek1976

ICL is 108 and LSA is110+2

speedtigger

iTrader: (16)

If you are not fly cutting valve reliefs and the heads have not been milled before, I probably would not mill any more than .015" myself.

uneek1976

Ok thanks I might just leave them be. If I don't mill them do you know where my compression will be?

speedtigger

iTrader: (16)

https://ls1tech.com/forums/carburete...l#post18396950

Post #27 answers that question.