71 chevy

iTrader: (18)

the lq4 is better

CALL911

iTrader: (17)

Well, I have been a big fan of meth injection with intercooling (have done it for years). E85 and different blends, and different tuning with those blends never really sounded too appealing. But after talking with you and Beast a bit, you have converted me. I wish there was someplace in Columbia City that sold it, but there is a station in between the Fort and CCity that isn't too far away.

In the end, I do plan on running E85, probably still an FMIC, but I don't think meth will be needed at that point.

Okay, but why? I appreciate the input, but be specific in your reasoning.

71 chevy

iTrader: (18)

the lq4 is 41 cubic inches more. it makes more power so it will allow you to get to your goal on less boost. less boost is easier on parts than more boost.

CALL911

iTrader: (17)

That was once my entire thinking as well. But now it seems there is more to it than that.

If I end up running the PT7675, it seems (via skinnies) that the 5.3 will be the better suited engine as it will make more power on it than the larger 41 cubic inch LQ4.

Now, my next question is; what about the S475? Would the S475 have any advantage on the LQ4 vs the PT7675 on the 5.3? I may be splitting atoms on this one.

The extra deck thickness on the 5.3 also seems to have its appeal.

Sarg

iTrader: (6)

Make more power with less boost yes. Hold that cylinder pressure better? No. The s475 could be configured to work better with the 6.0 as you could get it with the 96mm turbine and 1.32 ar turbine housing to work better with the larger displacement motor. Again, it is all about how the turbo is configured.

jridenour31

All things being equal, a bigger motor doesn't mean more power, it just means the power is made at a lower rpm, not lower boost.

typhoon1015

iTrader: (5)

which is better for boost? how bout the cheaper engine? 5.3's are had from 150-300 bucks, while the 6.0's are getting 600-1000 for motors. 7675 will make good power on both, it may be a bit small for the 6.0 but it stills works good with it.

I may be partial to the 6.0/7675 since that is what i am running, but its hard to argue with 2-3 5.3's sitting around for back up for the same price as one 6.0.

CALL911

iTrader: (17)

Where are people finding complete 5.3's for $150-$300? I have looked everywhere from Craigslist driving out of state to eBay, and although I have found them, the ones I am finding are going for much more than that.

Luke Skyjacker

iTrader: (1)

About a week and a half ago I burnt a piston in my JY 6.0. The fastest it went was 10.75 @ 131 in my 3600# cutlass. I'm gonna swap to a JY 5.3 with the same exact setup and compare the two.


Mods:
LS6 cam
Springs & pushrods to match
Victor Jr intake
750 blow thru carb

Garrett GT42-94R
Open 4" downpipe about 5 feet long.

It went 10.75 with a powerglide, car now has a th400
Anyone care to venture a guess of if I will gain or lose ET?

jridenour31

What heads?

Sarg

iTrader: (6)

I found a complete 5.3 iron block on craigslist for $250 then got a 5.3 L33 short block off ebay for $300 shipped. While it is frowned on by many I decided to go with 317 heads to drop compression down to around 9:1 since the L33 has flat top pistons and 9.9 compression stock. I did find a couple complete L33s (good heads too!) for around $1000 with under 100k miles on car-parts.com in my area.

typhoon1015

iTrader: (5)

I just got a 5.3 for 150 bucks, and also have a complete lq4 for 700 bucks, there's deals out there.

check out car-part.com for stuff local to your area.

Camaro9969

iTrader: (12)

Same here two lq4s one 04 105k 800 compete even wiring I see 5.3s everywhere cheap just call all the junk yards in your area

T76s10

iTrader: (6)

Got my lq4 on craigs for $400. If you pull one yourself from a junkyard you could probably get them cheaper. Denmah got one for $80 in his fairmont thread. If your willing to switch turbos from precision to borg then do the 6.0

Luke Skyjacker

iTrader: (1)

I had 317s on the 6.0
I'm not sure what the 5.3 has yet until I get it.

Im buying the 5.3 for $350. I got a buyer lined up for my hurt 6.0 for $250.

CALL911

iTrader: (17)

I'll keep looking. Maybe there are deals out there but I just haven't given it enough time yet.

Hypothetically, which would make more power;

6.0 with a well setup S475?

Or a 5.3 with the PT7675?

o2camaross

iTrader: (2)

Get that 60' down and you shouldn't lose any e.t. My 4200lb truck ran 10.97 @ 125 with a 5.3 and baby on3 turbo.

There is no reason to go with a 6.0 with the power these 5.3's are making. You can buy 3 for the price of one 6.0. That 7675 would be perfect for a 5.3 and has the capability to make 900rwhp.

shawnc16

You'd be better off with the S480 on the 6.0 and its still cheaper than the Precision unit. With the S475, I would think both combos are pretty close to a draw.

Check car-part.com if you haven't already.

MillsMotorvation

Anyone got a link to the Borg, and S480 turbos?

dmaxvaz

iTrader: (1)

Shawn, get off the interweb and get that damn camaro finished, slacker!