deadmanTA

iTrader: (7)

I'm about to rebuild my short block for boost and found a member on here who wants to sell this for $1100 shipped:

Brand new never used or opened
Eagle 4340 H Beam Connecting Rods 6.125 -
Wiseco Boost Pistons -25cc 3.905 bore -
Wiseco ringset -
LS1 Crankshaft, polished -

My only concern is that I have aluminium 317s (71/72cc chambers). Is my final compression ratio going to be below 8:1? Should I go with this deal?

98transguy

iTrader: (7)

depending on thickness of your gasket , .050 thick gasket gives u roughly a 7.66-1 compression ratio.

ddnspider

iTrader: (26)

thats retarded low of a CR for a street car

98turbls1

iTrader: (17)

Dude just go with some stock ls6 heads or 5.3 heads to bring it back up...

deadmanTA

iTrader: (7)

Thats what I was thinking too! Prob. going to pass on it.

Screamin_Z

iTrader: (2)

u can mill the heads and/or use a thinner head gasket

ddnspider

iTrader: (26)

honestly the heads u have are cheap so id just sell those and get some better heads with a smaller CC

stevieturbo

And then use 30psi of boost to make up for the low CR

ba78ta

iTrader: (3)

Excuse the novice boosted question.. but with modern day tuning.. why can't you run a 7.XX to 1 blower motor and a large amount of boost?

lack of low end power?
tuning/starting issues?

ddnspider

iTrader: (26)

guys are running 20 psi with 9:1 CR on blower car so why kill off idle power?

stevieturbo

you can, but with modern day tuning....we do it with relatively high CR's instead, and make more power everywhere.

Josh@KY-Turbo

iTrader: (120)

You would need a .040 headgasket and 58cc heads to get 8.5:1. There are alot of people selling great flowing milled heads in the 58-62cc range you could get fairly cheap.

bhz28

iTrader: (35)

I am using the -25cc pistons in my 370 and I am using 65cc chambered heads with a comp of 8.7:1 just to give you an idea.

Tom@SpeedInc

iTrader: (5)

IMO

I would go with Diamond 11503 -8.6 cc dish, 71cc heads and MLS gaskets.

I'm over stocked on -15 Diamond pistons (p/n 11517 370ci pistons) I could give anyone here a deal if you chose to go Iron block.

deadmanTA

iTrader: (7)

Thanks guys, just found a great deal on a low milage 02 motor. I'm going to use the money to get that and get my car back on the road, then I'll have an extra block sitting here to build a boost motor out of. I would love to have a 382 w/ some 225 AFRs.

ls1290

iTrader: (20)

A little nitrous to help spool up would not hurt either

Keith

phildo

iTrader: (7)

Sorry to bring up a old thread but I am confused. Here is a link to Wiseco who advertises a compression ratio of 8.4 to 1 with 72cc heads. What gives?

DanZ28

iTrader: (5)

No linky dink?

phildo

iTrader: (7)

My bad.
http://www.flatlanderracing.com/wise...ons-sbc07.html

DanZ28

iTrader: (5)

Yeah, theres no way thats right! If you leave everything the same and just change the head CC's around like they have, it changes way more than .1 CR. They also show the same CR for different bores and rod lengths, strange.