370 vs 408
370 vs 408 Id like your opinions, Im building a LQ4 I have everything to do a 370 just need the crank for the 408, will all things the same except the cubes how much power is the 408 worth over the 370?? the motor will be 11-1 fully ported 799s, ls6 intake, TSP 1 7/8 headers, same cam in either one. Just want to know how much power im leaving on the table?
Ok, now take this with a grain of salt from me, but here's what I see wrong with your problem. You say you have "everything" to do a 370, just need a crank for a 408. Do you have 2 sets of pistons already? They would be different from each other due to the additional stroke I would think. I too was in a similar situation deciding between a standard LQ4 and 408, when I talked to a couple guys to spec a custom cam, they both said the cam choice would be different based on the cubes.
Im building a LQ4 I have everything to do a 370 just need the crank for the 408
I knew this was going to turn into a you need you dont have thing. I'm just asking for opinions on how much power is left on the table with a 370 vs a 408, you're right I have not ordered pistons and i will do that when i decide but either way as I stated the motor will be 11-1. So back on track HOW MUCH POWER am I leaving on the table.
I knew this was going to turn into a you need you dont have thing. I'm just asking for opinions on how much power is left on the table with a 370 vs a 408, you're right I have not ordered pistons and i will do that when i decide
Anyway, like it's been said before, with those heads and intake you will not be down more then 20-25 hp and torque. But the torque will come in stronger and earlier in the powerband.
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Ah ok, so basically you're saying you have the 4.030 bored block and that's about it. When you say you have 'everything' means you have pistons, rods etc.
Anyway, like it's been said before, with those heads and intake you will not be down more then 20-25 hp and torque. But the torque will come in stronger and earlier in the powerband.
Anyway, like it's been said before, with those heads and intake you will not be down more then 20-25 hp and torque. But the torque will come in stronger and earlier in the powerband.
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Id like your opinions, Im building a LQ4 I have everything to do a 370 just need the crank for the 408, will all things the same except the cubes how much power is the 408 worth over the 370?? the motor will be 11-1 fully ported 799s, ls6 intake, TSP 1 7/8 headers, same cam in either one. Just want to know how much power im leaving on the table?
Id like your opinions, Im building a LQ4 I have everything to do a 370 just need the crank for the 408, will all things the same except the cubes how much power is the 408 worth over the 370?? the motor will be 11-1 fully ported 799s, ls6 intake, TSP 1 7/8 headers, same cam in either one. Just want to know how much power im leaving on the table?
With all things being the same, the 408 is at a slight HP disadvantage. Yes, it will make more power than the 370, but an optimum head/cam combo for the 370 will peak earlier in a 408, truncating the top end of the curve, but adding a bit more of a torque advantage on the bottom end.
That said, you never said what cam you are going to run, so we really don't have enough to go on. If you are running a small cam for stealth, the HP difference between the two could be minor. On the other hand, if you are running one of the popular donkey dick cams that are really too big for a 346 and marginal in a 370, a 408 might really shine.
That said, you never said what cam you are going to run, so we really don't have enough to go on. If you are running a small cam for stealth, the HP difference between the two could be minor. On the other hand, if you are running one of the popular donkey dick cams that are really too big for a 346 and marginal in a 370, a 408 might really shine.
if cost is not going to be much if a differenct definetly the 408 your talking a 40 cube difference so its a easy 50hp difference. consider that our engines make more than 1 hp per cube and even more than that with performance parts.
you will also have a broader powerband threw the RPMs, this was the reason GM went to a 6.0 litr from the 5.7 to begin with for the vette engine.
do youself a favor get the 408 you will kick yourself later if you dont.
you will also have a broader powerband threw the RPMs, this was the reason GM went to a 6.0 litr from the 5.7 to begin with for the vette engine.
do youself a favor get the 408 you will kick yourself later if you dont.
I wouldn't blindly throw the same cam into either displacement engine...but I would say the 408, given the same general quality of parts as the 370, and the same general budget in the top end, would yield 40ish more horsepower, and probably significantly more low RPM torque...maybe upwards of 60-70 foot pounds more.
Well Funds didn't show up for the stroker crank so a 370 its going to be Eagle H beam rods with 2000 bolts, 11-1 (custom ordered pistons), fully ported 799s, cam in the ballpark of the TSP 233-239 on a 112 LSA (it's gotta thump) It will be custom spec'd, Have to use my Ls6 intake for now. I think I'm going to get the TSP 1 7/8 headers in case i go bigger in the future.
