The thing that scared me about the stock castings was the thin deck and high boost, so I went aftermarket. Hard to argue with those flow numbers, although a couple big engine builders say they don't flow as much as those companies claim, but still will outflow any 23 degree factory head by a ton.


Jody

If you are going down this road i have a brand new GM FSR LS2 Engine for $3700.00 plus shipping. I was going to buy it for my 2nd project but my wife said she get's half of everything and i can see the kids on weekends.

I said okay i'll wait till project 1 is complete

you cant really compare a 15* ls1 to a 23* sbc,but ake a 15* ls1 to a 18* sbc and they are very close,most the aftermarket ls1 heads are 13* to unshroud the valve,sbc 18* and 15* heads flow just as well

I am just say that the sbc isn't dead.

Perhaps true, but then the LSx engines become much cheaper to build with good power than the 15-18 degree Gen 1 SBCs.

I'd agree with that.

Just ask Dave Henniger of FAST ( a fuel injection expert). I believe he set a record with an LS1 motor in Florida a couple years ago.


A new corvette gets 25 mpg. is amazing to me.

Absolutely not, there is as much potential in a standard small block with the aftermarket goodies. Of course, that can get expensive.

Jody

I was chatting with a guy from Chevy High Performance magazine about the LSx versus the traditional SBC last week. He indicated that GM was intent on making the LSx engine the new standard for engine swaps, just as the Gen 1 SBC has been for about 50 years. He said GM will be making a lot of parts (crate engines, cams, heads, short blocks, etc.) available for reasonable cost. Let's hope that's true. I'm thinking quite seriously about returning the SBC haders I got with my 21st Century sub for a set for an LSx.

My ported factory ls1 heads flow more then my out of the box Dart 18's did at about 1/4 the cost! I love LS1's!! They allow poor people to go fast!!

First, thanks to all who have posted!

True or False?

I have been told that the Iron block LSx engines are the way to go when Turbo Charging over 800 hp if you want good durability. I think the part number is, "LQ4 block".

Patriot Heads for the least expensive, AFR or ET performance at the other end. "Porting the factory heads are just as expensive as buying the Patiot heads"

Recommendation has been for a 408 inch

Any reason why one would not want to stroke it to a 427?

8.0 cr

75 lb. injectors

Does anyone have a web page for, "hk enterprises", in Houston? I have been told that they also make a good LSx Turbo ready engine.

I'm just dumping some information I've found and just trying to get a feeling if any of it is correct.

Thanks,

tyoneal