Free Bird

iTrader: (1)

I got a ZZ4 motor w/ corvette style heads and wanted to know if I could put a LT4 intake on it. What are the main differences between these two intakes, bolt holes, flow #'s, etc. Any help is greatly appreciated.

Would it be worth it to send it to John M to modify it for me? Thanks a lot guys.

John Millican

iTrader: (1)

I don't mess with LT4 intakes. The ports are differant then the LT1 and are best suited for the fastburn heads but still require port work to make perfect.
LT1 intake is the only way to go with standard SBC heads.

jmd

iTrader: (4)

Let's see. The Vortec heads have ports that are about the same height as the LT1 intake, and both are higher up than an alum. L98 / ZZ4 head, so there's a bit of mismatch there. 0.100 or so.

The LT4 intake ports are even higher (or taller, forget which), and a bit narrower, so that would be even worse.

Mini-Ram it.

Tyler-88

is the lt4 intake really that bad compared to the lt1 on a sbc?

jmd

iTrader: (4)

Depends on what heads you are running, Tyler. The LT1 intake is a port mismatch for Gen I SBC heads (pre-vortec) but it does match up real well on the Vortec heads. I'm not sure where fast burn heads fall in, but I believe they are quite close to the Vortec intake ports. The LT4 intake is right for LT4 heads, and unless you're running LT4 heads, you probably wanna stay w/ the LT1 intake, if that's the route you're going. On traditional non Vortec SBC heads, I would go mini-ram.

John Millican

iTrader: (1)

Your confused. the LT1 is a good match to gen 1 SBC heads, it can not mount to vortec's no matter what, there isn't enough material on the intake.

The LT4 intake is best suited to vortecs and fastburns.

The miniram is stupid priced.

jmd

iTrader: (4)

John please don't call me a liar. You merely discredit yourself.

The LT1 intake has raised ports. Every time I work on my cars I walk past my ZZ4 intake, a 94 Z28 intake, an LT1 longblock from a 95, and an L98 out of an 88 GTA. Do you wanna sit here and tell me the ports aren't mismatched due to being raised? C'mon now.

The LT4 intake has higher and narrower ports than the FastBurns or Vortecs. Mismatch again.

Let's be real. Is the LT1 intake a great value? Yes. Is it properly port matched to an SBC gen I head? No. I am not trying to smack down the hard work and research that you have put into this. But if you want a proper setup, there is port matching to be considered.

Start paying someone else for the ports to truly match up, and the $ gap of the mini-ram drops considerably. I do honestly feel that an AFR & Mini-Ram II motor will run a port mismatched LT1 intake motor out of town. But I certainly don't have the resources to throw down all the parts and dyno time to show it. So let's address the things that are known facts.

Matthew

John Millican

iTrader: (1)

Re-read my post. I said the LT1 intake is a GOOD match to a gen 1 SBC. I didn't say it was a perfect but it is so close that it's worth the time to swap. We're talking very little port matching going on here. Hell, some gaskets are off more then the differance between these two.

The LT4 intake and Fastburn/Vortec head? Well that's your only choice if you want to run the LT4 intake. I know there's some porting required. That's why I don't touch them, too much work.

Oh, the Miniram is still stupid priced.

Edit: The miniram or cylinder head you choose will have to be port matched too if you want perfect.

GofasterFirebird

iTrader: (3)

Well, I just bought an LT1 manifold and I think the ports line up better than my superram base to my AFR heads. Ok, so 1300 for a miniram or 150 for the lt1 intake i just bought. That included rails. So maybe 300 total and no 1,2 cylinder distribution probs?? Sounds good to me

GTA91

iTrader: (1)

Yeah, I gotta agree with you guys.

**Miniram=too much money
** LT1 Intake=CHEAP and great for poor college students like me