I no LT1s can run a higher Compression then a normal SBC what CR can i run in my LT1 running pump gas 93 with no problems

 

some engine specs?

 

383 stroker 64cc alum heads around 500 lift cam NOs injected

 

The most important thing to know is the duration numbers for the cam. The longer the duration on the cam, the more static compression you can run. In a way, static compression is really meaningless. You have to specify when the valves open and close to get the dynamic compression ratio. That is the number to look at most. Be sure you use the advertised (0.006" lift) numbers and not the 0.050" lift numbers.

I run 11.8:1 compression on 91 octane California MTBE gas, but that is with a 282/288 (@0.006" lift) cam.

BRAD

 

What he said.

But if you dont have the resources to compute your dynamic CR, shoot for around 11:1 and you will be totally safe on 92 up. From what it sounds like you have a small cam, just based on the lift, but if you have a rather large cam, 306 or bigger, you could technically run higher SCR, ive seen 13 running on pump gas before.

 

so 11 to 1 and i will be total safe... i havent picked a cam yet

 

Pick the cam and then build the CR based on the cam specs.

Rich Krause

 

what are the specs of the heads?

 

im gona use the trick flow heads..... what cam should i go with

 

Sorry, but ya cant pick a cam based on 383, trick flow heads, 64cc chambers, and NOs injected.

Talk to someone who knows what they are talking about with cams. Get ahold of Bret (sstrokerace) or Joe Overton (joes94ta?). They are two people I know of on this board who grind their own cams, the Comp Cam custom grinds are only about $40 or $50 more than an off the shelf cam, and Joes Steel billet custom cams are $400, but well well worth it in my eyes...not sure if Bret does steel billet cams, but if so talk to either of them.

This is your absolute best bet, people might tell you a 306 or a XE236/242 or hundreds of other off the shelf cams that would work with your combo just fine. But until you tell a cam grinder absolutely everything you know about your engine/car, even things you dont know, you wont have a matched cam.

 

11.48:1 right here on Nevada aka California 91 octane, I am ok in the summer with 120 degree heat.

 

i dont no man im running 10.5 to 1 in my big block and over a 600 lift cam....

 

11.83:1 on Ohio 92 octane, no knock retard at WOT. You can run over 12:1 safely on pump gas with the right tuning, but sometimes maximum possible CR may not always be the best for your application.

 

nitrous+compression=