My "HOE" is on the road!!

[Lsx10]

the head situation is really rather simple, you had a cammed 5.3 with a 8.8 to 1 compression ratio. dynamic compression ration would be even worse...

you would want to have about 2.2 points more on your compression. even if the wiring and everything else was done right you would have lost far mor power then you would have gained.

I'm not trying to be a dick, but no you did not research this if you tried to put this setup togather. buy a book on building performance engines, it will help you alot.

also shame on your "friend" for trying to give you that setup.


this would be your engine specs if you wanted to put it into a calculator
bore 96.01mm
stroke 92mm
gasket .053 inches
cc volume 66.67cc's

and here is a calculator to plug it into
Engine Size and Compression Calculator

stock 5.3 heads are 61.1x cc volume
ls1 heads are 66.67 cc volume

keep in mind that is if they are untouched combustion chambers, and alot of port jobs will shape the combustion chamber for better flow which enlarge it even more which would lower your compression even more.

[GasGuzzler]

My point too. It should have run at 6.0:1 compression. Something else was the problem...something was disconnected that got corrected during the swap back to the other heads, the seats or spring set up was off holding the valves open and killing dynamic compression....something OTHER than the cc of the chambers obviously.

[RedHeartbeat]

+1

[pl4yboy]

My point too. It should have run at 6.0:1 compression. Something else was the problem...something was disconnected that got corrected during the swap back to the other heads, the seats or spring set up was off holding the valves open and killing dynamic compression....something OTHER than the cc of the chambers obviously.

Thats what I was thinking.

[DBRODS]

peanut gallery agrees...

[Frenchy]

This is mind boggling, lower (yet equal) compression cannot cause a no-start, motors havn't had 10:1 since there invention, high compression in a flathead was 8:1 then there was that real rough spot from about 1972-1990.


But this is worse, 4 to 6 weeks to get pads and rotors? Sorry bud, brakes are a 45 minute deal at the most.

I know something of how you feel, though. My truck has been down for 4-6 weeks while I accumulate parts to do a brake job. This MAY finally be the week I get 'er back together!

I'm rarely a douche but in these circumstances it's necessary

[GasGuzzler]

Well some of the old flat heads...not just F**ds have more like 6:1 as previously mentioned

[DigitalBoy0101]

But this is worse, 4 to 6 weeks to get pads and rotors? Sorry bud, brakes are a 45 minute deal at the most.




I'm rarely a douche but in these circumstances it's necessary

My truck had catastrophic brake failure as I was driving it. I knew the brakes were going bad prior to that, but I had to keep driving it while I saved up money to do the repair (digging out of debt sucks). Of course, I didn't have any parts yet when the failure happened.

Buying the parts (mostly) online added 2 weeks or so due to processing and shipping. I was set back a week and a half to two weeks when it turned out the supplier couldn't get the calipers I ordered online. It took them that long to refund my money. I ended up going with stock replacement calipers after that fiasco.

My truck is too big to fit in my garage......well, with all the crap my roommate has stored in there, anyway. I have to do the work on my gravel driveway. Also no air tools.

Then I run into the hard reality of my work hours.......I get home from work at midnight, and due to sleeping problems "my time" is from midnight to around 5:00-6:00 AM. I'm NOT gonna disturb my neighbors by lighting the place up like daylight and hammering away at night. So, the only time I can work on my truck (even without my nephew there) is on my days off (Wed/Thurs). Because of my screwy sleep and work schedule, I only have about 5 hours of daylight to work with on my days off after I get up.

I'm also going slow(er than normal) as I work because I have my 13 y.o. nephew over helping me, so he can start learning how to work on vehicles. Teaching safety procedures, explaining why some things were designed the way they were, diagnosing the multiple causes of the failure (with helpful input from this Forum), etc. He starts Shop class in school this coming year, so hopefully he remembers some of what we've been doing. If so, he'll have something of a head start on his class and it will all have been worth it.

I've always been slow when working on vehicles to start with LOL. I'm used to it taking me 2, 3, or 4 times as long as other people doing the same job. It doesn't matter. Everything gets done eventually, and done right.

And no offense, dude.......if it takes you only 45 minutes to do pads, rotors, calipers, parking brakes, and lines on all 4 wheels (without power tools, or a lift, or even concrete to work on), then you're really REALLY good. I bet it took me/us 2 hours just to get the tires off with my nephew there. I don't claim to be good. I might be a little better (though not quicker) than the Average Joe, but that's it.....and that's not saying much heh. For instance, when I get around to swapping an LS1/80 into my '89 Blazer some year, it's not gonna be a weekend project like it would be for some people. I suspect it would take me a good 3 months or so.

I got the rear of my truck put together today, before I ran out of time for this week. The fronts will have to happen next week. Sure, I could have done the whole thing over these last 2 days easily if I was working by myself, including paint. But hopefully my nephew is learning a lot and he'll be better prepared not only for his upcoming class, but for the rest of his life.

I'm not pissed about your comment at all, man. Just thought you'd see things differently with a more extended and accurate background on my brake project

My next project, before winter, will be to paint my faded grey lower body cladding, as well as the fairing (or whatever that thing is called on an Avalanche) and bed top. I probably won't be able to accomplish it on my 2 days off due to the meticulous prep work, so my truck will be down at least a week for that as well. I could probably do all the bottom plastic one week, and the top plastic the next week. Not sure I'd want to drive it for a week looking funky like that. The end result will be worth it, however. I'm looking forward to that

/end thread hijack, sorry!

[justinjthomas]

That was pretty long but I deff. See where your coming from in that aspect.

As for me to tell everybody else I'm the same way myself. Took me two months to figure out what my problem was.. Lol

and I can see that some people on this forum (not being rude) doesn't have patience for some of the people on this planet that doesn't do this everyday or make it a hobby to work on cars.

For my situation I bought a stocker 5.3l just to replace the 260k mile one that was about to blow and I started searching and seen some videos and this forum with guys and cammed out trucks and decided to give it a shot.

I spent the money like everybody else here to get where I'm at on the project.

But I'm just excited that my truck does run and I did figure out what the issue was. (thanks to a few that prooves I'm not that smart with head demensions)
My bad if I miss led anybody.

If I misspelt anything wrong I typed it up on my iPhone..

-Justin

[pl4yboy]

That was pretty long but I deff. See where your coming from in that aspect.

As for me to tell everybody else I'm the same way myself. Took me two months to figure out what my problem was.. Lol

and I can see that some people on this forum (not being rude) doesn't have patience for some of the people on this planet that doesn't do this everyday or make it a hobby to work on cars.

For my situation I bought a stocker 5.3l just to replace the 260k mile one that was about to blow and I started searching and seen some videos and this forum with guys and cammed out trucks and decided to give it a shot.

I spent the money like everybody else here to get where I'm at on the project.

But I'm just excited that my truck does run and I did figure out what the issue was. (thanks to a few that prooves I'm not that smart with head demensions)
My bad if I miss led anybody.

If I misspelt anything wrong I typed it up on my iPhone..

-Justin

But the thing is, you really didn't figure out what your problem was. You put stock heads back on that were assembled correctly. Your 5.7 heads just sound like duds. THATS why your truck wouldn't run, NOT because it was 5.7 heads on a 5.3. My truck has 243s stock.