hp gain from 364 to a 370?
03-29-2010, 05:31 PM
#1
hp gain from 364 to a 370? ok my question is how much hp gain would i be gettin going from a 364ci lq4 to a 370ci lq4? i have been buying my parts slowly but surely for my build and are now coming to the point of piston selction and am not sure if i should stay 364ci. i will be using the 224r cam which is 224/224 .581/.581 on a 114 a ls6 manifold and 243s. will be going with 10.8.1 cr also and the same exhaust in my sig. so will i benefit stayin a 364 using the 224r cam or would it be better to just go 370? thanks everyone for ur opinions and thoughts.
03-29-2010, 05:43 PM
#2
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More cubes is always better. Depends on if there's a cost difference in the price for the 364 pistons or the 370 pistons. If it's pretty much the same price, i would go for the 370. I wouldn't plan on making a hell of a lot more power, but I could see you possibly gaining a little
03-29-2010, 05:54 PM
#3
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ok my question is how much hp gain would i be gettin going from a 364ci lq4 to a 370ci lq4? i have been buying my parts slowly but surely for my build and are now coming to the point of piston selction and am not sure if i should stay 364ci. i will be using the 224r cam which is 224/224 .581/.581 on a 114 a ls6 manifold and 243s. will be going with 10.8.1 cr also and the same exhaust in my sig. so will i benefit stayin a 364 using the 224r cam or would it be better to just go 370? thanks everyone for ur opinions and thoughts.
Why even consider the change unless you need to bore it .030 to repair/rebuild? If it's leaking badly past the rings, you 'll pick up more power just from getting a better ring seal at either 364 or 370.
Why are you even bothering to build a bottom end? Stock, used truck 6.0L engines with good rod bolts are way strong enough for what your heads, intake and cam can produce. They also are almost always still well sealed even with relatively high mileage.
I guess I don't understand what you are trying to do. Well, maybe your siggy says it: "Blew up motor"
Jon
03-29-2010, 06:31 PM
#4
im not building the bottom end. im using a stock lq4 crank and rods. just upgaded to ARP rod bolts, head bolts, and main studs. the reason i ask about the pistons are because i am gonna be puttin in forged ones cuz of my want of a 150 or 200 shot later. and if i go to 370ci i found a set of flat tops that at 70cc chambered heads the motor would be at 10.3.1 thus taking advantage of the 317s i already have. and if i were to stay 364 i would need to buy a set of 243s to get the cr up along with pistons. im more looking for a strong running st car than a numbers car. my main concern was just wondering if the 224r would not perform as well in the 370ci cuz of it being more cubes so the cam would act smaller.
03-29-2010, 09:54 PM
#5
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I don't want to get off topic, but I've been told the stock crank and rods would take only about 500 HP. Now with the arp main, rod, and head bolts are those ratings said to be increased?
03-29-2010, 11:22 PM
#6
the rod bolts are what you have a problem with at 500hp. so i am putting in arp 2000 series rod bolts which will strengthen them for more than 500hp. not sure what hp they will give out at now though. also since i want to run a 200 shot of nitrous i decided to go with the head bolts and main studs just to be safe. but 4 what i want out of my build this will be way stronger than stock and is just a piece at mind.
03-30-2010, 11:15 AM
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Yeah that's pretty much what I am doing with mine. And with a can and then the nitrous I'd already be over 500. I though I'd have to replace the whole rotating assembly!
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03-30-2010, 03:19 PM
#9
if you use arp rod bolts the stock crank and rods will be fine. but if use the rod bolts it would b smart to have the rods re sized at a machine shop. also have a radius cut in your crank and have slightly polished. and you can also have them magnafluxed to check for stress points. but its all up to you.
03-30-2010, 11:03 PM
#10
You would gain zero HP.....only TQ is guaranteed with a displacement increase.
More HP is only accomplished with better breathing and/or higher compression. Heads, intakes, exhaust mods, cam swap.....all of the above aid cylinder fill. The displacement only determines what RPM that air will be used most effectively.
Given the same top end, your 370 will make about the same HP and about 7-8 more ft/lbs of peak torque which does effectively increase your average HP, but not your peak power.
Higher TQ figures and more average HP is always a good thing but head into this knowing its not peak power the slight extra displacement will help provide for you (only peak TQ).
-Tony
More HP is only accomplished with better breathing and/or higher compression. Heads, intakes, exhaust mods, cam swap.....all of the above aid cylinder fill. The displacement only determines what RPM that air will be used most effectively.
Given the same top end, your 370 will make about the same HP and about 7-8 more ft/lbs of peak torque which does effectively increase your average HP, but not your peak power.
Higher TQ figures and more average HP is always a good thing but head into this knowing its not peak power the slight extra displacement will help provide for you (only peak TQ).
-Tony
