After doing some research I found that with my set-up a .039 head gasket and milling my heads down to 52cc I can achieve 12 to 1 compression is this still a safe compression to run on 93 pump gas on the street.

 

I'm running 12.3 with 93 no problems.

 

THx thats what i wanted to hear did you have any problems with the stock starter turning it over

 

http://www.rbracing-rsr.com/comprAdvHD.htm

you should be able to get away with it as long as your cam closes the intake valve at or after 72 degrees abdc.

good tune and a good working cooling system and you should be fine. do you have 93 octane or 91 octane where you live?

 

Yep its the dcr you need to figure. For a good read on dcr and a dcr calculator go here dcr calculator.

In addition to what zigroid mentioned a good quench will help too.

 

we have 93 here plus sunoco 94 and 110 octane turbo blue if i wanna spend $6+ a gallon

 

It turns over just fine. LT1's love compression. BTW your using the same setup on your 355 as I have.

 

lol i have been seeing that a lot. I am also hoping for a 11s N/A lt1 i have an A4 though using a yank ss3600 stall and 3.73s in the back with some weight reduction.

 

I was wondering about mine. I'm now on a .0 deck with the piston .005 in the hole, i'm using a the .26 impala gasket if i can find some, If not .28. I have a 54cc head and -4.8 cc Flat tops. I hope i can pull off 91 cause no 93 on this state

 

LOL you shouldn't have much of a problem. I still have my cam only tune in, now I'm shooting for 10's after a dyno tune and some suspension tweaking.

 

ok lol i am messing something up on my DCR never was good at math.

Given my set-up in my sig a zero decked block. .039 gasket and 52cc chambers what would be the DCR if i was using the gm847. i don't plan to use this cam I am going with a custom grind that might be similar so i just want to see what turns out.

 

What was you getting? Using the 847 I came up with 8.2dcr.

 

i was getting something like int he 10s lol i was putting in the wrong numbers though

I am going with a custom I will have it spec'd after i have my heads done so i am not really worried that my DCR will be bad i was just worried that something a little big like that would give me to high of a DCR. It seems that 8.5 is what i should keep it around or a little under. so I guess if I used the 847 it would be good I am still set on custom though. did you do the calculation with 1.5 or 1.6rrs i forgot to add i was using them.

 

running 12:1 SCR and 8.8 DCR. I use 92oct on the street and 100 for a 200 shot out of the hole

 

I'm running .029 impala gaskets (mr. gasket set), milled heads and stock shortblock, I figured I was somewhere near 11.5:1.. no problems on cali 91 octane.

 

As long as you have either enough cam to bleed off the compression and / or not a lot of timing it should be fine. Another thing that shouldn't be overlooked also is an adequate cooling system. High compression motors get hot and usually stock isn't up to the task of cooling it down.

 

110 is $4.75/gal here ^_^

 

Lift has no affect on dcr. Dcr is determined by the pistons location at intake valve closing. For example a stock cam would close the intake valve with the piston much closer to bdc therefore would have a higher dcr than a larger aftermarket cam because the piston would be up higher when the valve closes.

Also the lobe profile has to be considered too. For instance I was going to use the comp 503(224/230) cam but it pushed my dcr around 9.0. So I went with the gm846(222/230) and with its lazier lobes it made my dcr at 8.5. I hope this makes sense I can barely keep my eyes open, so I'm going to bed.