Thread: Recomended Compression for SR20DE Build

skip both headers, buy a header from me 4:1 stepped, proven power.

the maz 4:1 lost major power on the few motors it was tested on.

so have you come up with what compression your gonna run ?

stratton.

What do you make for a header Strat? I don't want to buy a JMR product but if you designed it yourself and make it to sell, I feel you are trustworthy enough to deal with I am really just curious on pricing as I know what John charges and would like to compare the two. Also if you could give me options, I know John likes to use the Burns Stainless products but he said he has done them with Vibrant SS stuff too.

I wanted to run 11.5:1 but the pump gas here in Costa Rica is like 91 Octane and some times i think lower... so it would detonate, so i stayed with JWT recomendations of using 11.0:1 CR, acording to what i have readed, using a 2mm headgasked will allow me to get that CR.

Later in the proyect i will be testing other CR's but as i havent found much people using S4HL cams with this pistons dont know if higher compression would help, i think 11:1 is still low for that cams... but JWT has the last word...

S4 cams worked great for me on several 10:1 CR DE´s. 11:1 CR should be just fine...