MHG Question

[oldsking]

I was searching and think I got it nailed down but I am still a bit stuck. I am leaning toward composite because of cost and ease but I want to run more boost then stock level so I know I need a MHG. Back when I built domestics we could run Fel-Pro's and tons of Spray and be fine with ARP's but these 7m's, ugh..

Anyways, the block and head i have are resurfaced but not decked though they are super smooth. Could I run a MHG of a small size? Concern I have is the cam gear cover where it bolts to the block? The thicker the gasket the lower the compression ratio correct?

 

[gaboonviper85]

Generally the thicker the gasket the lower the compression, yes...but it all depends if the motor was decked at some point in it's life...sometimes a thicker gasket will make stock compression if done properly.

Keep in mind that a 100 shot of nitrous in a 3l motor is different than a 100 shot in a big v8....same amount of spray for both but one breaths much more air and can handle alot more...

I don't understand your concern about the timing cover is....your only worry should be that the timing cover is perfectly flush with the block deck!

 

[oldsking]

I was thinking that it bolts to the block also sorry haha

Okay well If I want to lower the compression Id go with a 2.0m because when our head is compressed and torqued its 1.37m so technically I would have slighty lower compression going this route. My head and block were not decked as the paper work shows (I bought this set up from a buddy before I moved) but they were resurfaced and both are perfectly smooth. I think it would be wise to run lower compression for more boost in the future right?

 

[easternguy2005]

I went to a 2.5 mm cometic and blueprinted the compression to 8.2:1

Tried a few composites but they don't hold up.

Everything that learned worked on domestics is out the window with this engine.

Smooth and FLAT...smooth and flat