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Crate engines

thatK30guy

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I was told the BBC Vortec heads are great performers even in stock form. I'm okay with getting them worked over but I'm also okay with shelling out the coin for some Merlin heads, too.
 

1-ton

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I'm not aware of the '96 and up Vortec port injected big block heads being prone to cracks.
I am aware of it. I bought a high milage used 1997 Vortec big block for $200, and was fully aware that the heads might be cracked...they where. At least the block was still good. The stock cylinder bore was still nearly perfect, but the heads where cracked. The Vortec big block heads are good performers as long as they are not cracked from old age.
 

bp71k5

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Got a question to ask what you guys have experienced or heard about the Vortec systems on the 454's. I have a complete '99 BBC Vortec minus the crankshaft and have thought about getting a stroker kit for it but I'd only be interested in doing so if I can retain the big old Vortect intake, etc. Is there anything that can be done to modify the intake and injection to make it perform more and better than stock due to a larger bore and stroke? I could see building this motor up to 496 cubes but in order to retain the fuel injection what else needs done besides programming the computer?
They do make TBI injector trees that let you use more modern high pressure injectors. Mine has been running well after I figured out how to tune it.

Post in thread '71K5 - BP71K5's Just for fun build'
https://ck5.com/forums/threads/71k5-bp71k5s-just-for-fun-build.212062/post-3813945
 

Tnsejed

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I know this thread seems to have changed but I just got back into town and saw the tag. We used to use some crate engines for builds and customer cars. I also have been running my crate LS3 which hasn't hiccuped. We put in alot of gmpp crate stuff as well as Jasper crate and reman. This was also a long time ago. My tranny is a Jasper reman I installed in a rez bus that I then ripped back out more than a decade later for my build. We had very good luck with both.

I think the highest mileage gmpp engine I know of personally was my uncle's 572 in a chevelle which did powertours every year and was driven all over the place before he passed. Took some time getting it tuned as back then it was a marine based management system, but then it ran without issue.

Sure it can be alot of money, but if your looking at something mild and want reliability I don't think you can go wrong at all with a full crate setup. It also cuts serious time off your build timeframe. And getting stuff running and driving is of vital importance to having a build finished instead of one partially completed sitting for years.
 

vandelay industries

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About the connect and cruises: (and i'm looking at them as well, because.......i'm just not an engine person......)

1) How much larger are the 6 and 8 speed transes compared to a TH-350? Will the trans tunnel have to be "massaged?" Not actually a serious issue in my case.

2) Won't there have to be something on the brake pedal in order to disengage the torque converter?

I know this thread seems to have changed but I just got back into town and saw the tag. We used to use some crate engines for builds and customer cars. I also have been running my crate LS3 which hasn't hiccuped. We put in alot of gmpp crate stuff as well as Jasper crate and reman. This was also a long time ago. My tranny is a Jasper reman I installed in a rez bus that I then ripped back out more than a decade later for my build. We had very good luck with both.

I think the highest mileage gmpp engine I know of personally was my uncle's 572 in a chevelle which did powertours every year and was driven all over the place before he passed. Took some time getting it tuned as back then it was a marine based management system, but then it ran without issue.

Sure it can be alot of money, but if your looking at something mild and want reliability I don't think you can go wrong at all with a full crate setup. It also cuts serious time off your build timeframe. And getting stuff running and driving is of vital importance to having a build finished instead of one partially completed sitting for years.

This^^^^^^^^^^^^^^^
 

folkenheath

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Got a question to ask what you guys have experienced or heard about the Vortec systems on the 454's. I have a complete '99 BBC Vortec minus the crankshaft and have thought about getting a stroker kit for it but I'd only be interested in doing so if I can retain the big old Vortect intake, etc. Is there anything that can be done to modify the intake and injection to make it perform more and better than stock due to a larger bore and stroke? I could see building this motor up to 496 cubes but in order to retain the fuel injection what else needs done besides programming the computer?
We can use the stock intake and parts and put a Holley ECU on it to give you modern self tuning and fully programmable EFI with most of the old parts.
 

folkenheath

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I figure I will add my opinion on the crate engines. They are good engines for a drop in and go customer. Typically I don't recommend them because most of the time you can build an engine for cheaper that has more application specific parts. Just like I am not a fan of the "Stage 1,2 blah blah" cams, I also don't think you should have to pick between only two 572 engines, either high or low compression, with no other cylinder head, piston, camshaft, intake, options, etc.

I like to hand select the parts for each application. So generally I help people pick out parts that better suit their application.

With that said, I can get some GM crate engines shipped truck freight from my distributor or directly from GM through my distributors. (I am not a direct GM parts dealer).

If I wanted a 572 I would order the block and all the parts and assemble it myself and know the compression, cam, heads, everything was directly matched to my application. That doesn't come with a warranty, but I know its done right. If it wasn't a forced induction application I would build a 615 or a 632, total price isn't any different it has even more power output.

If that's not for you and you would rather just put an already done engine in, then I hear you and completely understand. I'm not sure what to say on the warranty, it sounds like you could get parts warranty for your install and not a labor warranty.
 

AJs72K5

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Depending on what you’re looking for @thatK30guy, I’ve been considering selling the 496 and FAST EFI that’s in my K5…

FWIW.... @folkenheath helped me spec it out and select the parts for the build.
 

AJs72K5

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Full specs for the 496....
Mark IV 454 4 bolt main block bored to 4.310"
Rotating assembly:
Scat forged crank (4.25" stroke)
Scat forged H-beam rods (6.385")
Mahle forged pistons (18cc dome, 2cc valve relief)
Brodix Race Rite BB-O heads (115cc combustion chamber, set up for solid roller cam)
Comp solid roller cam 11-771-8
Duration - Intake 280* Exhaust 286*
Lift - Intake 0.646" Exhaust 0.653"
Lobe separation 110* (it'll be lopey)
Brodix single plane intake
Static compression 10.0:1
Dynamic compression 8.17:1
ARP main and head bolts... I did head studs originally, but couldn't get them to seal. Switched to bolts and no more leaks.
Melling high volume oil pump.
All Felpro gaskets



https://ck5.com/forums/threads/72-k5-ajs-overbuilt-cruiser-build.225250/page-31#post-3642723

If I had to guess, it doesn't even have 250 miles on it as I've never gotten the EFI fully tuned (that was next, but life keeps getting in the way). Going a very different direction with the K5 build. PM me if you want more info on it.
 
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