Blue02Ws6

iTrader: (3)

Ok so I have a 402 with -14cc dished pistons and I am using TSP 230cc Terminator heads. What kind of SCR could I get, or what cc would I have to get the combustion chamber to? Also, why would I want to use cometics over the mls gaskets if I could get the SCR to atleast 11.5:1? I know quench is power but really is it worth it for the $$? I am also batting around cam ideas, if I can get the SCR to 11.5:1 what kind of cam specs would you think would make some great power with atleast some decent streetability? I have a couple of suggestions now but would like to let others get in on the fun... It will be dyno tuned in the next week or so and will let everyone know.

slow trap

iTrader: (22)

i think with an .040 gasket with 59cc heads my 408 has around 11:6-11:7 scr with a -12 dish so you will be a couple tenths of a point lower than me with a -14 cc piston.

Blue02Ws6

iTrader: (3)

Yeah we think we can get the heas milled to get 11.5:1 but I was just wanting to see what some people thought or recommended on a few things, guess it was too much to ask..

slow trap

iTrader: (22)

well on the cam i am going to run the 244/248 on a 110 +1. with you being very close to the same scr if you mill the heads down somewhere around 59cc with an .040 cometic i'd say that cam would be good for you also. as for the cometics i needed more scr and the tight quench helps with detonation along with raising scr so it was a no brainer,well as long as they don't leak anyways.

PREDATOR-Z

You are around 11.8 depending on pisto/deck position. I put in .01 out.

Impatient aren't you?
59cc heads, .040, -14cc and .010 out of hole still only gets you 11.4

Next time put all data involved to get an answer, I guesstimated on you piston/deck height. If that is less than .01 out of hole, then it will decrease.

slow trap

iTrader: (22)

i think they are between .006-.007 out acording to my depth mics.i think it was around 11:72 scr but the calculator i did use don't work anymore

Blue02Ws6

iTrader: (3)

lol, sorry it's just that I need to decide on a cam pretty soon since it is going together next week. Sorry I don't know how far the piston is out of the hole. .010 would prob be a safe guesstimate though I would think.

I don't think I want to go any smaller cc on the heads, I damn sure don't want to run into problems with my intake fitting on. 11.4 should be fine though to make some HP NA. I just need to figure out how big I want to go on the cam now.

Beast96Z

iTrader: (21)

Remember the Cometics are saving you a .014" cut on your heads and your quench is dead on. It does suck that they cost so much compared to the GM units, but that's how it is sometimes. I could see cutting the heads down to 59cc's, but not any more. That coupled with the .040" Cometics will get you 11:4. That should be plenty for what your wanting to do. Then you can get into a low 240ish cam and still have reasonable DCR.

Blue02Ws6

iTrader: (3)

Yeah, I'm going cometics for sure now, I was on the fence but with these pistons and my goals I think it is a must now and they ar only about $90 more, what's $90 after $12K....lol I also think that second larger cam you recommended would be a badass one too from what I have read lately. I think I will go ahead and get the FAST ported also before the dyno tuning.


On another note, how the hell is TSP going to tune my new motor without a good break in period?

Beast96Z

iTrader: (21)

Dyno tuning is usaully done right off the bat. It's usaully best for the rings anyway. Helps them find a groove and seal up faster. I thought you had already sent the intake off? Second cam gets the thumbs up from me. DCR would then be optimum at 11:4 SCR.

Blue02Ws6

iTrader: (3)

Nope got sidetracked with that whole SC thing... I will need to get on the ball now though. What did you come up with for the DCR with that second cam?

BlackHawk T/A

iTrader: (3)

You don't need a break-in period. Actually, its best not to.

Blue02Ws6

iTrader: (3)

I read that whole thread on this subject, and there were a lot of good arguement on both sides of the fence.

Beast96Z

iTrader: (21)

11.4 SCR/8.4 DCR with that cam and assuming .010" out of the hole, 59cc chambers and .040" gaskets.

slow trap

iTrader: (22)

i'm still on the fence about the break-in also.i guess it depends on what rings you run also.i'm sure a regular ring compared to something like hell fire rings will take longer/shorter to seal.seems like moly rings take alot longer to seal so i could see driving it around some at varying rpms to try to seal them but i don't know.some people build a motor,run it for a few minutes and then change the oil and flog it on the dyno.

BlackHawk T/A

iTrader: (3)

What thread?

Read this and it will change your mind.

http://www.mototuneusa.com/break_in_secrets.htm

By the way, do you really think that all the sponsors on this site, and their racing teams, drive their new motors around "leisurely" to break them in? Hell no, they go on the dyno immediately.

slow trap

iTrader: (22)

we use to go by if the rings aren't seated after breakin of the hydraulic cam they probably aren't going to but that was your run of the mill rings.everyone has their own opinion so nobody has a direct fact that either is better.different rings act different and so does different hone techniques/finish.you may build one motor and take it directly to the dyno and the rings seats and you may run one for a few hundred miles and the rings may still may not be sealed/seated.