wavrdr

iTrader: (1)

Hey guys, I'm going through a transition with the car and have quite a few different options going on in my head....

Keep current topend, but go with a forged TSP 383 bottom end. What would my DCR/SCR be and would it be optimal?
ETP 215 @ 59cc/Cometic .040
Fast 90(ported)
G5X3/114

This combo will run me about $6,000 after a new clutch and all the incidentals...

Or go with a LS7 setup and put myself somewhere in the $12,000 range?

All thoughts are welcomed and appreciated!

Alan

LostCauseZ06

iTrader: (4)

what kinda pistons??? dished or what??? if not dished that compression is gonna be WICKED high... with my wiseco -8cc's and 63 CC heads im running 11.4:1 compression... .

JRracing

iTrader: (35)

I would try to keep what you have and build off of that. You have some really nice parts. Just get the short block to match it.

wavrdr

iTrader: (1)

Mahle -6cc or the Diamond -7cc....

I could always change the headgaskets. I calculated it out to be like low 13's on the SCR and mid-high 9's on the DCR which are both way up there...

I thought I made an error, so I figured I would make a post and gather some thoughts!

Alan

wavrdr

iTrader: (1)

I hear ya....I actually picked up a set of upgraded LS7 heads las night as they were a good deal....Now I'm thinking about something a little less expensive.

347 $3k
383 $4,250
402 $5k
427 $12k(full build with new dual disc clutch, minus $ recouped from selling off 346 parts)

Oh, I'm not made of money either, so the realistic side may get the better part of me here....

davered00ss

iTrader: (4)

TSP has 383's for $3,500

LostCauseZ06

iTrader: (4)

no you cant... you have to keep your quench down... those CC"s on the heads are way too small.. go with some 65's minimum

yak

iTrader: (15)

actually I was going to run a 383 with -7cc pistons and a .040 cometec with a 60cc head and an x3 on a 112. It came out to 11.8 and 8.9 repectively on the compression if I remember correctly. I got a 346 with the same setup and its pretty good now at 11.6 and 8.7. I'm hoping to make some good numbers.

Beast96Z

iTrader: (21)

The Diamond pistons would net you 11:8 SCR and a 8.95 DCR. It's on the higher side, but could be ok if tuned properly. Your quench will be fine in the .033" to .043" range, so you could back off to a .045" or possibally a .050" gasket if you had to.

LostCauseZ06

iTrader: (4)

how far is his piston out of the bore?? im confused...


with my 63 CC heads, .010 out of the bore pistons, -8cc dish's and .040 gaskets my compression comes out to 11.83:1.... he has less dish, way smaller head CC's and everything else seems the same?? i cant use my calculator but seems like it will be well over 12:1 compression ration..

correct me if im wrong.. like i said i cant get on my calclulator.. ****** dial up

Sigforty

Are you taking into account that your 408 is a 4.00 bore and a 383 is 3.905?

Beast96Z

iTrader: (21)

Cubic inches increases compression. If you used the same parts he's talking about, you'd have 12:4 SCR. He needs the smaller chambers to increase the compression to match what you can do with bigger chambers. In this situation, all things being equal, the 408 has a :5 point bump just from the cubes.

LostCauseZ06

iTrader: (4)

AHHHHH HAAA~! i knew there was something more to it hehe

makes alot more sense now thanks guys