Throttle body crate engine

[Mv7fd]

Does this motor come with everything to make my truck from carb to throttle body because if so I'm all over that
http://www.jegs.com/i/Chevrolet-Perf...353K3/10002/-1

[gchemist]

Wow, nice setup with FI. The FI is a stand alone system. You'll need to connect an O2 sensor. You can weld a bung in or switch to headers with a bung already welded in. You'll need a fuel pump not included.

[Just call me Sean]

I would buy an old TPI Camaro or Firebird and swap that in, then buy a crate motor if you found it necessary.

[Mv7fd]

it is an awesome set up but I don't know if it's worth the extra cash over a carb set up

[dfrank]

Looks like a good setup. My only question is why include a 2 barrel throttle body with a 4 barrel intake?

[Mv7fd]

Not sure but it's a 670 2bbl

[Just call me Sean]

Pretty sure there aren't any four barrel throttle bodies.

[DirtyLarry]

Looks like a decent deal but I’ve never been a fan of any aftermarket EFI systems especially Holley’s that is a continuous open loop system. That is a pretty crude EFI system IMHO…GM hasn’t used a constant open loop system since the early 80’s when TBI was still rocket science.

You can buy that same engine from Summit for $1509 with free shipping then like Sean said, use a TPI system and end up with a better end product with maybe a few penny’s left over.

FWIW, 2 barrel throttle bodies on a 4 barrel intake is not bad or anything new. GM did that from the factory on TBI 454’s from 1987 to 1990. Holley had or has a 4 barrel TB unit but it is typical Holley material. Have you ever noticed there are a lot of used Holley EFI systems on CL for some reason?? Just sayin

[68post]

Originally Posted by Just call me Sean

Pretty sure there aren't any four barrel throttle bodies.

Here's 43 : http://www.summitracing.com/search/p...rder=Ascending


I'm not sure the engine listed above would or wouldn't benefit from a larger CFM, but most do !
If they rate 2 venturi throttle bodies the same way they rate 2 bbl carbs the 670 would be about 424 in four barrel CFM. I had a racecar that was restricted to using a 2 bbl and we used a stock Holley 670 racing 2 bbl and it was a restriction. Completely different scenario compared to the crate engine above tho'.

The package should run comparable to an '88 to '95 factory TBI setup with a little less torque or gas mileage. Looks to be a nice "plug 'n play" setup !

[68post]

I completely agree on the TPI style setup , and it would work great on the GM L31 vortec crate engine with a vortec compatable base.

[Just call me Sean]

Originally Posted by 68post

Here's 43 : http://www.summitracing.com/search/p...rder=Ascending

Sorry, I tend to think in factory type parts, factory fuel injection systems. That's more what I meant, but not what I said. You're right.

I did a MPFI 3.1 swap from a Firebird to an '86 S10 Blazer 4x4, so I didn't have to change the transmission. Got the car for $200.

[gchemist]

You can also go LS and carb!!!

[Mv7fd]

I called jegs it has everything you need fuel pump and computer and it doesn't work off an O2 sensor

[dfrank]

Originally Posted by Mv7fd

I called jegs it has everything you need fuel pump and computer and it doesn't work off an O2 sensor

Then how the hell does it monitor air fuel ration to meter the fuel?

[Mv7fd]

Speed density

[Just call me Sean]

Speed density still uses an oxygen sensor to determine the air/fuel ratio.

[Mv7fd]

I asked them at jegs they said speed density no o2 sensor. And the kit doesn't include an o2 sensor

[Mv7fd]

http://m.summitracing.com/parts/hly-502-20s

[Just call me Sean]

Because it's a crude terrible system, like DirtyLarry said here.

Originally Posted by DirtyLarry

Looks like a decent deal but I’ve never been a fan of any aftermarket EFI systems especially Holley’s that is a continuous open loop system. That is a pretty crude EFI system IMHO…GM hasn’t used a constant open loop system since the early 80’s when TBI was still rocket science.

You can buy that same engine from Summit for $1509 with free shipping then like Sean said, use a TPI system and end up with a better end product with maybe a few penny’s left over.

FWIW, 2 barrel throttle bodies on a 4 barrel intake is not bad or anything new. GM did that from the factory on TBI 454’s from 1987 to 1990. Holley had or has a 4 barrel TB unit but it is typical Holley material. Have you ever noticed there are a lot of used Holley EFI systems on CL for some reason?? Just sayin

Without an oxygen sensor the computer is only guessing. Might as well just have a carb on there.

[Mv7fd]

So a carb system would be better and it'll definitely be cheaper

[Just call me Sean]

No, a proper fuel injection system would be better. In my opinion, I'm a fuel injection guy. But I prefer OBDI.

[Mv7fd]

Is there any really good way to tune a carb

[Just call me Sean]

With an oxygen sensor.

[kalbert]

You could do better I think. Especially in the TBI department.

I had a Holley throttle body for a while, not the whole EFI system, just the throttle body. It was a good quality well machined piece with poor quality electrics screwed to it. I wasn't overly impressed, and ultimately ditched it for a stock unit.

It's not hard or expensive to get 250hp out of a TBI motor, and it will have plenty of torque for a pickup. Check out the link below, this pretty well sums it up.
http://tbichips.com/?page_id=73

[Mv7fd]

Yeah I'm just going to stick with a carbureted crate motor sounds a lot easier to ,e