L92 heads vs. 317 heads???
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On The Tree
Joined: May 2010
Posts: 157
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L92 heads vs. 317 heads??? What are the differences between the l92 and the 317s (stock flow numbers, port size, and valve size)?
And what would be a better choice on a lq4 turbo set up for the street? I plan to used the 02-04 z06 cam if that makes any differenece.
And what would be a better choice on a lq4 turbo set up for the street? I plan to used the 02-04 z06 cam if that makes any differenece.
Id go with the L92s. I have a set of Lingenfelter CNC LS3 heads on my S-10 and love them.
The 317s are 210cc, 2.00" valve, and flow about 250ish
The L92s are 260cc, 2.160" Valve and flow right around 312cfm.
The 317s are 210cc, 2.00" valve, and flow about 250ish
The L92s are 260cc, 2.160" Valve and flow right around 312cfm.
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Brett Foote From what I have seen most places sell the LS3 not the L92s
You can find some L92s for cheap on ebay or such and then just get the ls3 intake valve and springs of your choosing for your cam choice
You can find some L92s for cheap on ebay or such and then just get the ls3 intake valve and springs of your choosing for your cam choice
Stock cast L92's have a thin deck and that combined with 4 bolts per cylinder make it a poor choice for a turbo build.
They do flow well, with some porting my L92 flowed just over 330 cfm and I ran mid 9's N/A. Bang for buck a great head for N/A and even a bit of nitrous but not too much.
All Pro makes an L92 head, real thick deck-maybe check those out.
They do flow well, with some porting my L92 flowed just over 330 cfm and I ran mid 9's N/A. Bang for buck a great head for N/A and even a bit of nitrous but not too much.
All Pro makes an L92 head, real thick deck-maybe check those out.
I had this same choice for a fairly low budget boosted build. I actually had both sets and decided to run a ported set of 317s. You don't really need that huge intake runner for a turbo car, and my choice of turbo limits my engine size to a small engine, so I figured the ported 317s would work best.
11 Second Club
Joined: Apr 2010
Posts: 36
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From: Fishers, IN
last i read, guys were getting pretty close to the same numbers (within 5-10) with a ported L76/LS3 manifold that others were getting with a ported 102.
530 was used or brand new?
11 Second Club
Joined: Apr 2010
Posts: 36
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From: Fishers, IN
i didnt look into assembled heads when i was getting my pile of parts together because i knew i was going to need different springs and would upgrade retainers/locks as well.
brand new 5364 (L76) castings. i just took a quick look and apparently the seller i bought from doesnt have any right now but he was running best offer auctions with 10 sets of heads pretty much all the time back around august/september of last year.
i didnt look into assembled heads when i was getting my pile of parts together because i knew i was going to need different springs and would upgrade retainers/locks as well.
i didnt look into assembled heads when i was getting my pile of parts together because i knew i was going to need different springs and would upgrade retainers/locks as well.
I am going FI so I am waiting for TSP to come out with theirs before i decide on a head. Thicker deck with 6bolt is desired
