Hey guys toying with the idea of buying an aluminum 5.3 and mounting my magnacharger on top of it. I think the l33 5.3 has almost 10 to 1 compression. My thought was throw a set of 6.0 heads to lower compression down and put a small pulley on it. Any ideas what my compression might be? Any help would be greatly appreciated.

Shawn

 

Go for it, I did the same with the 317 heads. I think my compression was a 9:5 and was told the heads will bring it down to about the 8.5 mark.

 

so will the 6.0 heads bring the compression down on an LM7 also. Would any other work need to be done. I putting a turbo on mine, so that might be a good idea for me too. anybody know what stock compression is on the LM7.

 

The stock heads on the L33 5.3 seem to flow very nicely. I would try it without the head change first

 

Curious about this for my LM7 as well... Wouldn't this allow more boost and longer motor life?

 

LM7/LM4/L59 9.5

I don't know about just putting a set of heads like the GTO 6.0 without a good porting on my LM4 but then the compression goes up, I don't know how much for say a 64cc and I don't know how much hp you would gain, I have heard you can get to much flow and then a guy says on a super charged engine you can't get to much and if you get to much compression just turn the alky up, Would like to hear from someone that has tried it

 

I don't think the point is the flow, but rather the lowering of the CR to where it is acceptable for boost.

 

Yeah thats what I was thinking ^. Im sure the 6.0 heads will flow more than the 5.3 heads, But it would also be nice to lower the compression for boost applications.

 

Patting my own back here but the L33 has proven a very good platform for the Radix. My track times show that.
The L33 heads are not the same castings as the LM7/LM4/L59 9.5's.
I make 9.5lbs with a 3.2" pulley.
Times and Dyno charts are in my sig, click the pic.

Enjoy

I'm just saying that the L33 does well as is, lowering the cr with a set of worked heads may allow you to increase boost/timing a little bit more.