mannyman84

iTrader: (2)

I have some ls6 (243's) heads that I'm putting on my ls1. Some of my friends are telling me that I should go with the 5.3's. What are you guys opinions?

Whiteaw57

iTrader: (2)

alot of people go with ported 5.3s for good flow and lots of compression. if its between stock 5.3s and stock 243s then go with 243s hands down. the 5.3 heads theyre referring to are like prcs stage 2.5 5.3 head from texas speed. or i think hpe has a stage 3 5.3 head. flow almost as good as a 243 ported and also raise the compression usually to around 11:1

01ssreda4

iTrader: (96)

LS6 is a better head stock, there shouldn't be any argument about that

mannyman84

iTrader: (2)

Cool. Just wanted to make sure.

ta-stanger

iTrader: (6)

Send your 243's to AI and get ready to smile!

SCott5

iTrader: (40)

A stage 2.5 5.3 head compared to a stage 2.5 243 head. World of difference performance wise?

S1LV3R

iTrader: (5)

I always thought all bets were off once either of the heads were ported?

R6cowboy

iTrader: (3)

I'd stick with the LS6 heads you already have. If you are not having them ported, stock for stock, the 243's without a doubt. Either way, stock or ported, I think you should keep the 243's.

mannyman84

iTrader: (2)

Great. Thanks for the info guys.

Also. Would it be a major noticeble difference between ported and un-ported 243's? I'm debating if I should or shouldn't. It would be going outside of my budget.

R6cowboy

iTrader: (3)

Yes. Not power adder noticeable, but it is noticeable.

A.R. Shale Targa

iTrader: (2)

Fairly certain the 243s flow about 260 cfm stock and Advanced Inductions
has a price friendly valve job and freshen w/PSI beehives which will do ya
right and cost less than a full port job