ported LS1 heads Vs. stock LS6

**krazykarl454** · 11-29-2009, 06:03 PM

ok so if i was on a tight budget. say around 500ish. and i already have comp beehive springs and titanium retainers, but im lookin for a better flowin head should i go with a set of stock LS6 heads, or take my chance with gettin my LS1 heads "Stage 3" Ported, and get the stock valves backcut 40 degrees for 500 bucks through a company i found? i'm running a tsp 220/220 .588 114 cam. does any one have flow numbers of the ls6 stockers?

Stage 3 LS1 Ported Heads

241 Casting

(These heads are flowed on a 2" valve with no pipe)

.300 lift (intake 218) (exhaust 177)
.550lift (311 intake) (241 exhaust)

Heads are flowed on a SuperFlow 600 Flow Bench

Heads are ported at 28" H2O

thanks again guys

**tep98ws6** · 11-29-2009, 07:31 PM

Ported LS1 heads flow just under stock Ls6 heads. If you do a minor clean up of the LS6 heads, you're able to pick up +/- 10-20 cfm. I did mine myself and picked up roughly 25cfm. As long as you're careful and just do a clean up, you can get the better heads and do a decent port job for next to nothing on the porting side.

We put ported ls1 heads on a CETA (LS6 intake/cam/headers) and it topped out at 371HP with a tune.

I'd def say LS6 heads

**c5z28** · 11-29-2009, 07:37 PM

head flow info
http://www.ls1tech.com/forums/genera...ng-thread.html

**krazykarl454** · 11-30-2009, 03:48 AM

hmm.... thanks tep. yea i've cleaned up a couple dirtbike jugs. well thats very interesting. that would keep in in my budget. i guess u had a flow bench layin around tho?

**tep98ws6** · 11-30-2009, 05:30 AM

Originally Posted by krazykarl454

hmm.... thanks tep. yea i've cleaned up a couple dirtbike jugs. well thats very interesting. that would keep in in my budget. i guess u had a flow bench layin around tho?

no prob. kind of, at school. haha
this teacher that was helping me with the mathmatical part of flow was telling me about how he made a flow bench when he was 10 and was telling me how to build one and apparently it's "super easy" but i got lost amongst all the engineer talk

**Marc 85Z28** · 11-30-2009, 08:05 AM

Those flow numbers are BS. Especially for $500 and with cut stock valves. What shop is claiming this?

Oh, and Stage 3 usually refers to something designed for a 4" bore or larger.

**krazykarl454** · 12-02-2009, 07:00 PM

yea it sounded almost go good to be true to me too. its this shop out of Florida. well i would much rather pic up a set of LS6 heads and clean them up my self. don't they also have the sodium filled ex. valves?