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Old 07-29-2013, 10:41 AM
How fast is fast enough?
 
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picking a chevy engine

I'm trying to decide between an LT1 or a 5.3L for my next build. I have a sbc that I'm almost done building but I'm bailing on it and am just going to part it out. It was built as a hot racey street enigne and as I get nearer retirement I am finding I want something a little calmer on the freeway and that gets better mileage on the weekend cruises.

My current choice is either a 5.3L or a LT1, both would get a very mild cam upgrade (likely just a regrind), clean the ports up some, mill the heads some, and tune and run. Nothing over the top, probably a total of less than $1000 in either engine. I would like to hit around 400hp, which isn't too hard wit these plans but even if I fall at 375hp I wouldn't be upset.

Are there really no reasons to run a LT1 over a 5.3L or even a 4.8L? I can't think of any. Surely I am missing something here, or is it really just that obvious?

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Old 07-29-2013, 11:12 AM
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I have a 5.3 in my 92 S10, I will never go back to a carbed motor in a hot rod. I haven't done any cam changes to it but we used a Hp tuners to set it up and more than happy with power.
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Old 07-29-2013, 12:10 PM
How fast is fast enough?
 
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Quote:
Originally Posted by Indian113 View Post
I have a 5.3 in my 92 S10, I will never go back to a carbed motor in a hot rod. I haven't done any cam changes to it but we used a Hp tuners to set it up and more than happy with power.
Oh I wouldn't consider a carb either, by LT1 I mean the gen 2 engine, not the 70s gen 1 engine.
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Old 07-29-2013, 04:25 PM
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Either way,@ the end of the day,you're gonna say,"Dang,I shoulda built the other 1"!!!!!!
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Old 07-29-2013, 04:39 PM
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Quote:
Originally Posted by Indian113 View Post
I have a 5.3 in my 92 S10, I will never go back to a carbed motor in a hot rod. I haven't done any cam changes to it but we used a Hp tuners to set it up and more than happy with power.
I think the Gen II LT1 and LT4 are kind of orphans. Not that they aren't highly capable but they really are a technical step toward, if not a testing ground for, the GEN III engines. So they have one foot in reverse cooling with carefully controlled inlet temperatures of the Gen III, but drag along a distributor that is weird by any standard and not like the Gen I nor even used on the Gen III. Going ahead a few years I think the Gen II parts well will become pretty dried up.

I'd either go with a Gen I simply because there is so much aftermarket and factory support available that will be there well into the future while the power development of the Gen I is more than less identical for whatever you would do to a Gen II for less aggravation and certainly less money.

The Gen III's are more capable than the Gen I or Gen II but are considerably more expensive. But the bucks you spend result in a lot of bang with these motors while the support in the aftermarket and from the factory will only get better going ahead in time as these are the future and the Gen I and Gen II are the past.

Bogie
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Old 07-29-2013, 06:20 PM
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An iron LQ4/9 bottom end, cam and heads of your choice, Megasquirt or carb and I'd never look back. Maybe a bit more $$$ going in but an LSx engine will slay a Gen 1 sbc 23 degree head combo as far as power to cam duration.
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Old 07-29-2013, 08:24 PM
How fast is fast enough?
 
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I can't see a gen 1 being any cheaper than a LS engine, a simple cam swap with headers and you're over 400hp on either the 4.8l or 5.3l. Never even have to open the long block.

The lt is an orphan line though and maybe that's a good reason to avoid it. I'll probably just go 4.8 or 5.3 as its cheap and easy. Lt engines are cool for their unique factor but not really practical.
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Old 07-29-2013, 10:50 PM
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I would go LS,
I dont see 400 HP from a 5.3 or 4.8 with a cam swap,the heads do not flow "that much"
what I do see id the LS-3 guys buy better heads and that leaves the 5.3/4.8 ready for a big and very cheap improvement.
The ZO6 guys are buying mast heads freeing up fantastic heads that will likely land on LS3 s. You can also tolerate a little more CR with the LS engine and the fuel injection works quite well.
I would build a 6 liter truck engine and suffer with all the parts getting tossed out by the serious guys.

you are good at scrounging,look at what used heads are floating around,and use at least the LS3 hot cam or maybe a used cam from a ZO6?
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Old 07-29-2013, 11:03 PM
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5.3L heads flow good. That engine w/a cam and headers = 433 hp. And that's w/a Thumpr cam at that! 325 Chevy Small Block Engine - Bolt On A Cam And Heads And Add 120+HP - Car Craft Magazine
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Old 07-29-2013, 11:31 PM
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Thats more flow than I gave the 5.3 heads with the small bore. 440 HP means they nailed the cam specs for that engine.That cam is close to what LPE uses for the ZO6(GT-19) except the lift values
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Old 07-30-2013, 12:27 AM
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They claim about 220 cfm from 1.89" intake valves on a stock head w/good exhaust ports to boot, so I agree the cam must be pretty close even being a Thumpr. Might be some room for improvement, but I didn't look at the specs yet. I'm sure you've seen this too, but the LS heads seem to like 1-3/4" primaries.
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Old 07-30-2013, 05:37 AM
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They claim about 220 cfm from 1.89" intake valves on a stock head w/good exhaust ports to boot, so I agree the cam must be pretty close even being a Thumpr. Might be some room for improvement, but I didn't look at the specs yet. I'm sure you've seen this too, but the LS heads seem to like 1-3/4" primaries.
for the ZO6 the primaries are 1 7/8s and LPE uses similar specs as the thumpr cams,sometimes more than 12 more timing on the exhaust side
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Old 07-30-2013, 05:56 AM
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5.3L LS Small Block Build - Here Comes Modern Mouse! - Super Chevy Magazine

That cam can be reground on a stock core, add in an ls1 intake swap and maybe a little head clean up for a super cheap 400hp using stock parts. They hit 385hp with just a cam and headers. A very small cam at that.
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Old 07-30-2013, 11:52 AM
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Here is a post I made on another forum this AM.

Here is some GEN 3 info
Gen III GM Small Block: Engine Builder

Here is some GEN 4 info
LS1, LS6,LS2, LS3, L99, LS4, LS7, LS9 And LSA Engine History - GM High-Tech Performance

And I finally found the bible I was looking for , all the GEn 3 and 4 engines, and where they were used.
Performance Chevy LS Engine Comparison - Chevy High Performance Magazine


peace
Hog
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Old 07-30-2013, 11:54 AM
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5.3L LS Small Block Build - Here Comes Modern Mouse! - Super Chevy Magazine

That cam can be reground on a stock core, add in an ls1 intake swap and maybe a little head clean up for a super cheap 400hp using stock parts. They hit 385hp with just a cam and headers. A very small cam at that.
Stay away from the LS1 intake as it flows less than the truck and the LS6 intake manifold, as long as you have the room. If you don't, go with the LS6 intake, which also came on the 01-02 LS1 F-bodies.

peace
Hog
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