I have just finished up with my LT1 383 and I have some questions on the compression ratio and the cam overlap. Will I be able to run 93 octane fuel in the car?
The engine has

SRP -5cc flat top piston
6inch rods
3.75 crank
deck height on block .016
heads 54cc
The cam is a 237/245@50 112 lsa
108 centerline on the IN 116 on the EX
intake valve opens @11 btdc
intake close 46 abdc
exhaust opens 59 bbdc
exhaust valve closes at 6.7 atdc
So I have only 17.7 deg of overlap

I have a 12.1 compression ratio now and my cam is ground for nitrous so I dont have that much overlap in the cam. I am really unsure if I can run pump gas in the motor. I did a compression check and I had 210psi which is the same as when I had my old setup stock bottom end and I run pump gas no problems but I had a CC230/236.

With everything listed above. Will I be able to run pump gas in the car? I would like to get some good advice before I put 93 octane in and try to run it. Even if you dont think that it will run on pump gas Please post.

Also when I do spray it I will run race gas anyways.

Thanks for any help

 

The intake closing point determens your dynamic comp.There are calc.on line to help you figure.If you are at or below 9x1 you "should" be ok with proper tune.

 

I have tried to use a few calc but but I am not sure if I am using them right. When I key in the information it tells my I have a 10.76 dynamic compression. I am not sure if this is right? does anyone know if this is right?
My adv duration is 295/301

Here is the calc I used
http://www.rbracing-rsr.com/comprAdvHD.htm

 

PM me with your stroke, rod length,bore, adv duration, @50,intake closing point, piston compression height, gasket thickness,type of piston,cc's of valve relief,head cc's,block deck, top ring placement,and all other spects and I will run it on mine and tell you exactly what it is.

 

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