3.890 5.3 tt
Thread Starter
Staging Lane
Joined: May 2014
Posts: 61
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3.890 5.3 tt Hi, can anyone help with iron vs alloy tt. Iv read about people boring 5.3
I'm building a small ls tt, my max bore is 3.889 looking at 850fwhp, but under constant load, I understand the ls1 block cannot handle this but the 5.3 bored can,
How much stronger is the iron block bored to 3.889 over the factory ls1 alloy block.
Cheers
I'm building a small ls tt, my max bore is 3.889 looking at 850fwhp, but under constant load, I understand the ls1 block cannot handle this but the 5.3 bored can,
How much stronger is the iron block bored to 3.889 over the factory ls1 alloy block.
Cheers
Thread Starter
Staging Lane
Joined: May 2014
Posts: 61
Likes: 0
I have looked into stock bore and the 2.9 crank, but very limited to heads, I like the mast ls3 small bore heads, but they require 3.89 bore,
If the iron block bored is much stronger than the ls1 I'd be happy, but how much stronger
If the iron block bored is much stronger than the ls1 I'd be happy, but how much stronger
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Use a 4.0 bore minimum. Better heads.
The tall deck on the ls is going to kill that 265 incher.
Rods way to long, piston is HEAVY.... That thing needs to be in a short deck block.
How high are you planning on spinning it..
I've always loved the small cu in small blocks. NOTHING like watching the tach go by 10.
Keep a eye on the Bob weight. Where do you think it will be.
The tall deck on the ls is going to kill that 265 incher.
Rods way to long, piston is HEAVY.... That thing needs to be in a short deck block.
How high are you planning on spinning it..
I've always loved the small cu in small blocks. NOTHING like watching the tach go by 10.
Keep a eye on the Bob weight. Where do you think it will be.
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Staging Lane
Joined: May 2014
Posts: 61
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Won't spin much past 6500 but it will be constant load for 30-40mins, I'm not sure about bodyweight yet, once I get an idea on everything, I'll hand it over to the engine builder, stuck on block choice atm,
Appreciate all the input
Appreciate all the input
9 Second Truck Club
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From: Colorado Springs, Co/ Central, Ca
Also OP I wouldn't put a huge head on a small CI like that unless it will be reving 10K RPM. Id look into the smaller TFS head or small cc AFR. That will still be huge on 260 CI. JMO
Thread Starter
Staging Lane
Joined: May 2014
Posts: 61
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I'm not an engine builder but I have been told to go with the best flowing heads, let the turbos do the work and try keep lift and springs down for reliablty?? reliable is key for me more important than power
Trying to keep the boost low makes zero sense to me. If your building a boosted engine, let the turbo do the work. Boost isn’t hard on an engine if it’s done right. Look at the 24hour turbo Le’Mans engines.
Head flow won’t be the limiting factor for your goals, even on a factory head.
For example:
Factory short block 4.8. Worked 862 OEM truck castings, 228/230 .57x lift cam, and a Fast intake made 450/380 at the flywheel around 7k RPM. 15lbs from an efficient turbo setup would double that. Done deal!
Not suggesting you use factory parts for your application. But power shouldn’t be a problem if you don’t limit yourself on boost levels.
Head flow won’t be the limiting factor for your goals, even on a factory head.
For example:
Factory short block 4.8. Worked 862 OEM truck castings, 228/230 .57x lift cam, and a Fast intake made 450/380 at the flywheel around 7k RPM. 15lbs from an efficient turbo setup would double that. Done deal!
Not suggesting you use factory parts for your application. But power shouldn’t be a problem if you don’t limit yourself on boost levels.
Launching!
Joined: Jun 2010
Posts: 255
Likes: 1
From: Alberta, Canada
Trying to keep the boost low makes zero sense to me. If your building a boosted engine, let the turbo do the work. Boost isn’t hard on an engine if it’s done right. Look at the 24hour turbo Le’Mans engines.
Head flow won’t be the limiting factor for your goals, even on a factory head.
For example:
Factory short block 4.8. Worked 862 OEM truck castings, 228/230 .57x lift cam, and a Fast intake made 450/380 at the flywheel around 7k RPM. 15lbs from an efficient turbo setup would double that. Done deal!
Not suggesting you use factory parts for your application. But power shouldn’t be a problem if you don’t limit yourself on boost levels.
Head flow won’t be the limiting factor for your goals, even on a factory head.
For example:
Factory short block 4.8. Worked 862 OEM truck castings, 228/230 .57x lift cam, and a Fast intake made 450/380 at the flywheel around 7k RPM. 15lbs from an efficient turbo setup would double that. Done deal!
Not suggesting you use factory parts for your application. But power shouldn’t be a problem if you don’t limit yourself on boost levels.