Erock

iTrader: (3)

I am cammed 232/238 duration .599/.600 lift, and have full bolt ons, I made 375hp to the wheels with stock 98 ls1 heads. What do you think the improvement would be if I switched to stock ls6 heads? Any input would help, Thanks

desertLS1

iTrader: (8)

I Would get an LS6 Intake if you dont already Have one..You'd most likely hit the 400 Mark with stock LS6 heads, if not very close to it...Very worth it..

1SLwLS1

iTrader: (6)

I had cam only MS4 and picked up 25 hp across the entire range, although peak torque was about 10, I am unsure as to how well that carried throughout, and I was on a dyno with a stock clutch that was slipping at the top of 4th everytime.

Erock

iTrader: (3)

Ok so I'm looking at 25 hp to the wheels, not bad, what if I ported them, then how much do you think?

Ethan[ws6]

iTrader: (13)

I know a guy that got 421 down with cam only (ms4).

desertLS1

iTrader: (8)

Depending on who does the Porting, i would guess about 35-40rwhp. Heads are a vital Mod alot of people ignore.

I have stock 243's with a VRX4 cam and a Ported FAST and put down 430rwhp thru a stalled auto...I plan on getting the PRC Stg 2.5 LS6 heads to get the most out of my set up...

1SLwLS1

iTrader: (6)

Whats your point?

Erock

iTrader: (3)

Thanks everyone, but since I have perimeter bolt heads now, is there anything that I need to do to switch to the 243s? Valve covers???? I am trying to have everything lined up so there are no hickups in the swap.

DoubleTapDrew

iTrader: (1)

Valve covers and coil brackets for them since the coils mount different (coil braket part number 12563288, you'll need two and they are about $10-$15 ea). GM MLS head gaskets are 12498544 (that's a kit with both gaskets, about $30). Valve cover gaskets were 12560696 but it looks like that part number is no longer valid.