for all of the LSX non-believers....... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**americanmusc1e** · 03-04-2010, 01:02 AM

I was playing around in Desktop dyno (I know, the power figures are optimistic) the other day with different cylinder heads for my 383 to see how much hp I could gain without a cam change. (currently running vortecs). and the best heads I tested were AFR 195 Competition CNC Ported heads. (http://www.airflowresearch.com/index.php?cPath=24_29),

but in my travels on the internet I ran across the flow numbers for L92 (GenIV LSX) heads and decided to see what they would do on my 383 even though it is physically impossible to do...........Wow, I was impressed, you can get these for less than $1000 usually. LS motors have awesome head flow

here is a link to where I found the head flow info http://www.ls1tech.com/forums/genera...flow-data.html

NOTHING is changed except the head flow and the valve sizes

stock vortecs

AFR

L92

nomrlz · 03-04-2010, 12:31 PM

actually those figures are purdy dam close if you had the right cam in

shortbed70 · 03-04-2010, 01:12 PM

They make that motown motor that is a half breed of both.

team39763 · 03-04-2010, 01:18 PM

Yeah, there is a block that's out now that lets you put LSx heads on a regular smallblock style shortblock. I believe the point was cheaper bottom end parts, better oil system, badass LSx heads...sounds like it should be reliable and make tons of power. But I'd still just build a LS3 stroker or LS7 if I had the money.

wheatlandbrawler · 03-04-2010, 02:33 PM

merlin makes that block i think... the only problem is the money u spend on the block you lose the "cheap" rotating assembly ya know.

03-04-2010, 01:02 AM	#1
americanmusc1e Senior Member Join Date: Jan 2009 Location: Austin, TX Posts: 1,079	for all of the LSX non-believers....... I was playing around in Desktop dyno (I know, the power figures are optimistic) the other day with different cylinder heads for my 383 to see how much hp I could gain without a cam change. (currently running vortecs). and the best heads I tested were AFR 195 Competition CNC Ported heads. (http://www.airflowresearch.com/index.php?cPath=24_29), but in my travels on the internet I ran across the flow numbers for L92 (GenIV LSX) heads and decided to see what they would do on my 383 even though it is physically impossible to do...........Wow, I was impressed, you can get these for less than $1000 usually. LS motors have awesome head flow here is a link to where I found the head flow info http://www.ls1tech.com/forums/genera...flow-data.html NOTHING is changed except the head flow and the valve sizes stock vortecs AFR L92 __________________ -- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted

03-04-2010, 12:31 PM	#2
nomrlz Registered User Join Date: Jan 2010 Location: Wataga,IL Posts: 666	Re: for all of the LSX non-believers....... actually those figures are purdy dam close if you had the right cam in

03-04-2010, 01:12 PM	#3
shortbed70 Registered User Join Date: Mar 2002 Location: Forney TX Posts: 4,512	Re: for all of the LSX non-believers....... They make that motown motor that is a half breed of both. __________________ Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274

03-04-2010, 01:18 PM	#4
team39763 Registered User Join Date: Feb 2007 Location: Texas Posts: 469	Re: for all of the LSX non-believers....... Yeah, there is a block that's out now that lets you put LSx heads on a regular smallblock style shortblock. I believe the point was cheaper bottom end parts, better oil system, badass LSx heads...sounds like it should be reliable and make tons of power. But I'd still just build a LS3 stroker or LS7 if I had the money. __________________ 1982 Silverado - SBE, cleaned up GM heads, small cam, TH350, 850 Demon, 4.56 gears, and caltracs. Best time so far 11.8@XXXMPH

03-04-2010, 02:33 PM	#5
wheatlandbrawler Registered User Join Date: Apr 2007 Location: salina, kansas Posts: 123	Re: for all of the LSX non-believers....... merlin makes that block i think... the only problem is the money u spend on the block you lose the "cheap" rotating assembly ya know. __________________ 1968 swb RIP 408. 388 roller monster mouse, richmond 5 speed. and alot of the stuff that makes you happy. build link. http://67-72chevytrucks.com/vboard/s...d.php?t=389826



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