GM LSX-L92 Small Bore Cylinder Heads
#61
There is a lot more to velocity numbers than port size. The fact that is has a 2.00 intake valve means the throat should decrease a considerable amount in size after the short turn radius. That alone will make a huge difference.
#64
I found another wrinkle in what some of the experts been telling us with a set of 4.00 inch bore L92s for small bore motors. http://www.edelbrock.com/automotive_...chevy-ls.shtml
Look about halfway down as the super vic carb intake saying about knotching into the block to fit l92 heads. Not optimal fitment I am sure with valve shrouding, and i bet yu would wanna stroke your lil 5.7 to 383 to take advantage of your new found breathing either way. I see this maybe being a cheaper by far and saying you did it thing.
Look about halfway down as the super vic carb intake saying about knotching into the block to fit l92 heads. Not optimal fitment I am sure with valve shrouding, and i bet yu would wanna stroke your lil 5.7 to 383 to take advantage of your new found breathing either way. I see this maybe being a cheaper by far and saying you did it thing.
#65
I build custom Pontiac engines for a living and some of our engines can use 2.11 intake valves with 5.3 liter size bores with notching and a lot of them came from the factory with notched cylinders so it does work and doesn't seam to hurt our motors too bad fwiw
I think the mast heads are great as an option for HOT 346's but more towards the 366-395 strokers imho but 2500$ without springs eek!
I was hoping they would make a smaller port head aimed at street/strip head for cars and trucks that would flow 330-340ish as cast and could sell complete for 1800-2000$ I think that would be a winner because in order for me to buy a set they need to beat all cathedral heads in the same price range, idk, we can hope LOL
I think the mast heads are great as an option for HOT 346's but more towards the 366-395 strokers imho but 2500$ without springs eek!
I was hoping they would make a smaller port head aimed at street/strip head for cars and trucks that would flow 330-340ish as cast and could sell complete for 1800-2000$ I think that would be a winner because in order for me to buy a set they need to beat all cathedral heads in the same price range, idk, we can hope LOL
#73
I don't know for sure yet. I just saw them advertised on PACE's website for $840 each, and it says they ARE available. I sent PACE a message asking if this was correct.
#74
Yes, they are availiable.. GM's Lansing PDC has them in stock with a list price of $875ea.. This includes valves but no springs.. Also, they are listed in the 2010 GM catalog on page 202.. They aren't pictured, but it does have the part# & info on them. Hope this helps.
#77
Here is what i got off crateenginedepot...
LSX/L92 #19201807
L92/LS3 port configuration
Produces from 356-T6 Aluminum with 5/8 thick deck
6 Bolts per cylinder, Aluminum construction
Runners are in as cast condition
250cc intake port and 80cc exhaust port
70cc Chamber size
Intake flow = 280 CFM@.600 / Exh flow= 180 CFM@.700
Assembled with 2.00 Intake and 1.555 Exhaust Valves
Beehive springs
15 Degree valve angle
3.890 minimum bore size block
Uses LS3 / L92 rocker arms
Requires the LS3 / L92 intake manifold
Looks like they are going for $799 a head. Has anyone tried these yet? Are these overkill for an stock cubed LS1/LS6?
LSX/L92 #19201807
L92/LS3 port configuration
Produces from 356-T6 Aluminum with 5/8 thick deck
6 Bolts per cylinder, Aluminum construction
Runners are in as cast condition
250cc intake port and 80cc exhaust port
70cc Chamber size
Intake flow = 280 CFM@.600 / Exh flow= 180 CFM@.700
Assembled with 2.00 Intake and 1.555 Exhaust Valves
Beehive springs
15 Degree valve angle
3.890 minimum bore size block
Uses LS3 / L92 rocker arms
Requires the LS3 / L92 intake manifold
Looks like they are going for $799 a head. Has anyone tried these yet? Are these overkill for an stock cubed LS1/LS6?