i have searched everywhere and my eyes cant take looking at this screen any longer............will the lt4 intake and heads bolt onto a thirdgen 350 block, if so, which years......

thanks

 

ports wont match up unless you are using vortec heads

 

Um, isnt the LT series reverse coolant flow? I don;t think those will work period. Just like an LT1 intake - someone correct me on this if needed, but the LT4 was (an awesome powerplant) a built LT1... same rules apply tho. The intake would work I think (needs adaptation), but to addon to what topguy said, you will NOT be able to use the heads.

 

missed the parts about the heads

i was under the impression most people knew that LT1/LT4 heads can be made to work on these engines

only time it makes sense though is when you are using the coresponding intake (as you mentioned you would like to)

to do this, 2 coolant ports in each head need to be plugged and each head must be drilled and tapped for a coolant line

simple as that

it is much worse though if you desire not to use the LT1/4 intake

 

so what would you recomend

working the lt4 heads..........putting vortec heads on.......or a different intake all together. i know about the other intakes i just thought the LT4 would be worth it and it looks mean under the hood. what would you recomend

 

Look at it this way. If you can't do the machine work yourself, it's just not cost effective to run LT1 heads on a regualr SBC block. By the time you pay someone to make them fit, you could have bought just about any aftermarket head.

As for LT4 heads, they don't exactly grow on trees (like LT1 stuff does) So instead of dropping a little on someone's old LT1 stuff, you're dropping a lot on the LT4 stuff, and then still need to have it modified. REALLY not cost effective.

 

The LT-4 intake will work with vortec / fastburn / e-tec heads with very little work (just needs a Milican type conversion). It's ALOT cheaper than buying a mini-ram III for vortec style heads.

 

he did also ask about the heads though.

the bolt holes are the least of your worries with a converted intake though. Covering the water ports is it's downfall, does it definitely do OK with those heads? If there are a few people doing it though, then it is defintely a cheap and effective way to do it.

 

what is the milican type conversion?

i knwo someone said that the intake will bolt on with with minor modifications....what am i going to have to modify, and which head would you recommend for this intake and what exactly would i have to do to make these heads work

 

but if you use the heads and intake together its not a bad setup at all and rather inexpensive

heads $200
machine work $100
intake $100
machine work $100 (i believe John will do it cheaper since he has to modify less if you are using the heads, please dont quote me on this though)
odds and ends $200

so thats $700 on heads that flow as well as vortecs and an intake comparable to a mini ram

i dont see how thats going wrong

 

where did you come up with 200 bucks for the heads and 100 bucks for the intake.......never seen the LT4 components that low

 

John Milican is a guy here on the boards that does the conversion to use LT - x intakes on old school small blocks. He or you, would have to bore a hole in the back of the intake (for distributor), and other mods for coolant etc....

Thats the Milican conversion I was in reference to.

 

LT1 prices..Not LT4.. BIG difference.

LT1 heads only flow 15 more cfm @ 28 inches than L-98 heads. The intake would be a good cheap alternative, but putting LT1 heads on a L98 would not benefit you that much..

I personally would buy some decent out of the box heads and modify an LT1 intake

 

Yeah, but DON'T put an LT1 intake on AL L98 heads. I know for sure of one guy who dumped anti-freeze into his block trying that.

 

LOL That would suck.. Why did that occur? There are people who do use the aluminum heads with no problems only from what I have read... LT1 intakes are used with aluminum on 4th gen F-bodys and Vettes. I did not know there was any difference between the L98 iron vs alum. heads.

 

yes, your correct, i lost myself there for a moment
LT4 pieces are indeed alot more than what i mentioned

 

I'd like to know this myself...

Of course, I'd like to have matching intakes on my cars...

 

It has to do with the SPECIFIC shape of the coolant outlets on the heads. On some heads, the LT1 intake simply does not cover the coolant outlets, just doesn't have anough material. And the AL L98s are one such example. But don't take my word for it:

https://www.thirdgen.org/techbb2/sho...1+coolant+leak

Even John will tell you that 4 out of the first 54 intakes he made dumped coolant into the oil and potentially destroyed engines. Is it worth saving MAYBE $1-200 vs.a stealth ram to take that risk? And that's assuming you get the LT1 intake dirt cheap. If you pay more than bottom dollar for the intake/rails it's a total wash...

 

I only saw a reference to "some aftermarket heads" having that coolant problem in that post. Considering the iron heads are identical to the AL heads for the L-98, I am not sure why you think the AL heads would leak? Maybe I missed something.

 

Yeah, what you're missing is i KNOW someone who bought one of John's intakes and bolted it to a ZZ4 and proceeded to fill his oil pan with coolant. Member name Free Bird, a local guy. I'm not sure if he's one of the 4 John mentions in that post or not.

It'd be nice if someone compiled a list of what heads are known to work and what heads have had problems, but i've never seen it. I really doubt that all of the people buying LT1 intakes are on this site, so the only person who could really collect that data would be John.

 

OK gotcha.Hey Ed, maybe you should put one on your 305, so you can have an excuse to put a real engine in there after it makes a milkshake out of it

 

FreeBird is the ONLY person in my 2 years of LT1 conversions that have claimed to dump coolent into the oil.

I have had a few complain about coolant leaking ON TOP of the intake because the intake didn't cover the upper part of the water port of the head. These were fixed by welding additional material to the intake flange.