01 blue ss

iTrader: (2)

I have a lq9 block and was contemplating going .070 over to use an LS3/L92 style aftermarket piston and use a set of TSP small bore PRC LS7 heads or a set of the LS7 RHS heads.

I was just trying to see if it will be safe on boost with going out that far with the walls. Plus, how far has somebody gone out with an iron block on the bore?

Fbodyjunkie06

iTrader: (10)

I personally wouldn't.

Furthest I'd go and feel comfortable is 4.030. Even with the 4.030 bore you can run the small bore LS7 heads.

1CAMWNDR

iTrader: (21)

If you are going to boost it stay at 4.03". I have a 4.07" bore on mine and it is filled to the water pump ports with HardBlok. I still would not boost it. I did not get the spec on wall thickness, just the sonic test came back "good" for that bore.

01 blue ss

iTrader: (2)

I thought the small bore PRC and RHS LS7 heads were for 4.060 and up bores only?

https://ls1tech.com/forums/generatio...-ls3-bore.html

1CAMWNDR

iTrader: (21)

Stage II ported 317 heads with bigger valves have made 1000hp with boost. What are your true goals?

01 blue ss

iTrader: (2)

Sorry I haven't got back to this thread but I have been busy the past couple of days. The goal is really simple: To make as much power as I can! Really though, I plan to try to run about 20 psi thru it. Before guys say that is too much boost on a 4.070 bore. There is a guy in this thread that bored an iron block to 4.125 and ran a 200 shot on it. Take a look.

https://ls1tech.com/forums/generatio...ter-block.html

TheLS1Lover

If you really want to make as much power as you can buy an ERL, RHS, or LSX block.

Just because one guy did it and didn't break, doesn't mean its proven.

4.030" Bore and a Set of TFS, AFR, or PRC heads. Its not like head flow is going to make a night and day difference.

Boost is just a reference of boost btw. You need to be looking at how much CFM you need to make a certain number. What turbo are you going with?

01 blue ss

iTrader: (2)

GT4788 turbo.