370 vs 390 vs 408
On The Tree
Joined: May 2012
Posts: 106
Likes: 1
408"... No replacement for displacement... (more cubes will take more air flow, less restriction/less psi)..Not to mention more power off boost, better launches, quicker spooling (if turboed)
4" Callies compstar crank is easily good for 1100rwhp... Don't believe the BS...
4" Callies compstar crank is easily good for 1100rwhp... Don't believe the BS...
Put a 390 piston next to a 408 piston, the difference is very clear, 390 has thick ring lands that support the rings better than a 408 piston. Also keep in mind the piston acts as a heat sink, thick 390 piston, heavier but can absorb more heat.
When I came up with the idea for the 390, Callies just came out with this C-Series 3.825 crank, the first ones I had seen measured very accurate, its a forged crankshaft with a keyway, offered a good option for anyone with a D1SC or 88mm turbo.
I'm surprised no other LS builders came to market with a 390 based motor.
On The Tree
Joined: May 2012
Posts: 106
Likes: 1
Off the shelf 370 piston is ok, but what they do is put the oil ring above the pin so it doesn't need a spacer. I believe they have a standard .270" ring land. Generally they come with standard steel .150 wall pins.
You could make a custom 370 piston for plenty of power, the shelf piston covers up to around 1200hp, thats good enough for most.
You could make a custom 370 piston for plenty of power, the shelf piston covers up to around 1200hp, thats good enough for most.
On The Tree
Joined: May 2012
Posts: 106
Likes: 1
Thats actually alot to ask for; At that level I would recommend 1/2" head studs.
Spooling a 98mm turbo, I would recommend more cubic inch than a 370... 390, it doesn't have to be AES, anybody could build a 390 engine.
Spooling a 98mm turbo, I would recommend more cubic inch than a 370... 390, it doesn't have to be AES, anybody could build a 390 engine.
Last edited by Fraser588; Jul 12, 2013 at 11:21 PM.
3.265" crank, LSA Heads, Soild roller, 8000-8500 RPM, 11:1, E85
Loosen the converter a little down low to take advantage of your new found RPM and don't worry about spooling the turbo
But out of the options your listed I would build the 370". Your going to be able to make more power with your turbo before running into drive pressure issues.
Loosen the converter a little down low to take advantage of your new found RPM and don't worry about spooling the turbo
But out of the options your listed I would build the 370". Your going to be able to make more power with your turbo before running into drive pressure issues.
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Verdad Gallardo I all ready have a running car. But i hurt my stock crank. wastegate couldent flow enough and i saw over 30.5 Lbs boost not sure exactly how much boost it made but on hptuners it flatlined the map sensor. I have callies rods and wessico pistons. Tfs heads and a proflo intake and a custom spec cam. Really all im doing is looking to replace my crank. But if its more then just a crank and bearings then i may look in to a new shortblock.
Well turns out the wrist pin retaining clip fell out and the wrist pin scored the cylinder on number one.
not sure if the block can get bored out enough yet.
tons of options now on the table for me right now.
Not sure what to do. Any ideas guys
not sure if the block can get bored out enough yet.
tons of options now on the table for me right now.
Not sure what to do. Any ideas guys
