Edelbrock's LT1 Power Package

[blackfire93]

Has anybody heard of Edelbrock's new LT1 Power Package? I was reading about it in the Camaro Performer magazine at the grocery store and was wondering if anybody knows how good it is for the price. It looks like it might only come with heads and a cam, but I'm not quite sure on that.

[redws6]

http://www.edelbrock.com/automotive/2108graph.html

i priced the kit on summit andit came to about 1300.

[Injuneer]

I don't think you are going to be happy with the 170cc inlet runner of the Edelbrock heads. They will be very limited in top end breathing, in spite of their graph. 170cc is the volume of the stock LT1 head runners. The LT4 stock runner volume is 195cc, and a set of healthy, ported LT4's approaching 300cfm intake capacity will usually spec out at 215cc.

You will get the best bang for your buck by taking your stock LT1 heads and having them ported by someone like AI or Lloyd Elliott, or one of the other proven LT1 head experts.

Simply picking up the "LT4 Conversion" kit has been proven to be worth more than 400flywheel HP (some claim 425HP, but that's an extreme setup). The Edelbrock kit can't match that.

[blackfire93]

Also for the LT4 kit, I would need to buy quite a few things to make it work for the 1993. I think that I would need: a vented opti-spark, different fuel rails, a heavy duty timing chain, and some other stuff that maybe you could tell me about. It just seems like the 1993 - LT4 option would be endless as far as price goes.

[wood]

i've got a 93 LT1 as well, thanks for the heads up man... I have been thinking about an LT4 upgrade and now.. well, I'm not.

[Z Ya Later]

Yeah, you would need a vented opti, new fuel rails, new intake, new timing set and some other things that don't come to ming. I'd just port your LT1 heads and intake, get a better cam, good set of headers, better throttle body, etc. I'd stay away from the Edelbrock kit, not worth the money.

[Craig 94 TA GT]

I don't really understand that graph...is it using an LT1 with bolt-ons i.e. CAI, roller rockers, etc.? If not, since when does a stock LT1 make 325 hp? Either way 73 hp and 36 tq is not impressive for a head/cam swap and 1 3/4 headers. I think Lloyd Elliot heads, headers and a good tune can make that gain (even keeping the stock cam)

[Injuneer]

I don't really understand that graph...is it using an LT1 with bolt-ons i.e. CAI, roller rockers, etc.? If not, since when does a stock LT1 make 325 hp? Either way 73 hp and 36 tq is not impressive for a head/cam swap and 1 3/4 headers. I think Lloyd Elliot heads, headers and a good tune can make that gain (even keeping the stock cam)

Depends how they dynoed it. The Corvette LT1 was rated at a conservative 300(net)HP, and that's on a dyno, with full "standard" accessories, full intake and full exhaust. If they put the engine on a dyno without all the accessories and the typical "dyno" style intake and exhaust, it wouldn't be unreasonable for a stock LT1 engine to make 325HP.

Yeah, you would need a vented opti, new fuel rails, new intake, new timing set and some other things that don't come to ming.....

For people buying the LT4 "kit", you don't need to buy a new intake, it comes with the package. The rails might fit, I'm not sure. Used rails are available for low $$.

Not defending the LT4 kit, just clarifying.

I would strongly recommend one of the "packages" (head/cam) from someone like Lloyd Elliott. He can tailor the package to your specific needs.

[Z Ya Later]

For people buying the LT4 "kit", you don't need to buy a new intake, it comes with the package. The rails might fit, I'm not sure. Used rails are available for low $$.

You're right, I forgot it came with the intake. But the 93 fuel rails wouldn't fit. The crossover pips are both in the back and would obstruct the rail from fitting down properly.

[Injuneer]

Is there a cutout in the 93 intake for the rear rail crossover pipes, or are the pipes located behind the intake? I thought the only difference between a 93 and a 94 intake was the front crossover pipe "groove" in the 94's. I honestly don't know, but I would like to know

[Z Ya Later]

I just looked. There's no opening on the rails to move the crossover to the front. Both crossovers are on the back, so I believe you would need a new set of rails for the 94+ intake. I don't believe they're that costly, but it is another thing to buy. I can take come pics for ya Fred if you would like. I'll have them out to do new injectors, FPR and EGR pretty soon.

[FireFinder20]

so how about the TFS heads matched to an LT-4 intake?

(I guess my Edelbrock cam should be on eBay now?)

[Injuneer]

The TFS heads have an excessively large combusiton chamber, and will lower your compression ratio about 1 point. They are intended (according to TFS) for blower and nitrous applications, although I can't see any reason you would want to drop the compression ratio with nitrous. The TFS heads "out of the box" flow about the same as a stock set of LT4 heads. The LT4 intake would flow no better on the TFS heads than an LT1, because its really no different than the LT1 intake, except for some excess metal at the top of the runners so the intake can be ported to match the higher runners in the LT4 heads.

There are porters getting excellent flows out of stock LT1 castings.

[FireFinder20]

boy, choosing combos is tough, lol...so then i may as well go with the LT4s for my 383...


surprised I didn't see you at E-Town yesterday for the GM EFI shootout...

[Injuneer]

Car hasn't been out of the garage since SLP Day 2003..... maybe in the next couple of weeks. I need to get the software upgraded in the MoTeC engine management computer, and solve problems with getting my "no serial port" laptop to communicate with the MoTeC. In the meantime, I've been removing random bits and pieces for small weight reductions. Replaced some missing tranny pan straps required by NHRA under 11.00. And I want to move the nitrous purge from inside the fender to a visible location out the front of the car.....

The main reason I don't go to E'town is that I don't think my exhaust will pass tech. Last year they added the requirement that the mufflers must be the "chambered" type, and mine aren't. How strict were they Saturday with the noise regulations?