Budget build Question

[egsvt98]

I've been wanting to build a new bottom end for my 03gt. Was planning on boosting the car a couple years ago, but as the years went on i don't really feel like going on with an all out build. Car already has full bolt ons and 44cc trickflow heads with crushman motorsport cams. I want to shed some weight so i wanted to go with an aluminum block. I know i can use 99-01 cobra, mach 1, aviator, and mark viii blocks. My question is with these 44cc heads what would the compression ratios be using any of those blocks. Car will be staying NA so i wont be pushing the stock internals to there limit. thanks for any help.

 

[Black02GT]

I've been wanting to build a new bottom end for my 03gt. Was planning on boosting the car a couple years ago, but as the years went on i don't really feel like going on with an all out build. Car already has full bolt ons and 44cc trickflow heads with crushman motorsport cams. I want to shed some weight so i wanted to go with an aluminum block. I know i can use 99-01 cobra, mach 1, aviator, and mark viii blocks. My question is with these 44cc heads what would the compression ratios be using any of those blocks. Car will be staying NA so i wont be pushing the stock internals to there limit. thanks for any help.

Short answer is what ever it is now. Block doesn't change CR that's a function of chamber size and rotating assembly.

 

[egsvt98]

I should have explained better I was talking about using the stock rotating assemblies from a 4v bottom end which I know will bump my compression but not sure how high it would be

 

[Blkkbgt]

It will all depend on the piston dish of each engine. I would try to find the dish of each engine and go from there. I would not go less then 10:1 compression on and N/A engine as long as you plan to stay N/A. If I were you I would build one with an aluminum block, cast crank (cast is lighter, go forged only if you want to spin it to the moon), off the shelf forged pistons and 5.0 rods.