SMKNGTA

I did a search on this and I came up with a post from back in December that was really interesting. I was just wondering if anyone has this setup running right now? And why isn't everyone doing this? Are there and cons to running an LT1's heads and intake on an L98 block? This would be a cheep way to get a good intake and aluminum heads for our cars.

John Millican

iTrader: (1)

The pros are that the LT1 heads are cheap.

The cons are that they do not directly bolt on. There is some machining to do which everyone isn't capable of.

1991tealRSt-topGuy

John, i did a search and found the article you posted about modding the LT1 heads to work

seems like it only makes sense if your going to run a LT1 intake

the modding isnt too bad, as long as you do run the LT1 intake

just need to block 2 of the coolant passages on each head

my friend, 86IrocL98, is going to be getting a set of LT1 heads (he already bought the LT1 intake)

if all goes well with his venture, i plan on doing the same

90iroc5spd

what article is that, i have never heard of doing this, what do ya do about cooant routing? do you have a link to the article, or a website about this?

thanks

SMKNGTA

John,
I realize that it only makes sense if you are running an LT1, but what I don't understand is why so many people with the LT1 intake go out and buy expensive after market heads when they can get LT1 heads for so cheep. They can modify those to work on our block and they can also be ported to make some really good power. You don't see the 4th gen LT1 guys buying aftermarket heads, they just port their factory heads.

SMKNGTA

I was just looking around on ebay and you can get aluminum LT1 heads for $200 and an LT1 intake for less than that. This idea is becoming very tempting. I might just have to try it out.

John,
Would I have to do anything else to the intake besides drilling for the distributor? Do you sell just the LT1 intakes with out the mods done to them or just with the mods needed to fit the LT1 heads on an L98, if so what do you charge?

Thanks

cobrakiller1989

iTrader: (1)

if you want to run LT1 heads and intake just do an LT1 swap, after you pay to have it machined and make everything work you could have just bought an LT1

John Millican

iTrader: (1)

The LT1 guys swap their heads out for LT4 heads, along with the intake.

John Millican

iTrader: (1)

http://www.lt1intake.com/LT1_retrofit.htm

John Millican

iTrader: (1)

Your telling me that an engine conversion is easier then swapping heads and intake?

I highly doubt it. You will have all kinds of little things bite you and you won't even have air conditioning unless your really good.

John Millican

iTrader: (1)

I can sell just the intake with only the distributor conversion for anyone. Same goes, either you provide a core or I supply one.
E-mail me for specifics

f-crazy

iTrader: (-1)

i bought an lt1 shortblock for 400 bucks...it needs to be re-ringed and bearings...and i bought some ported lt4 heads and a carbed lt4 intake...

fully assmebled ill have about 2,400 in to it....not to bad for 450 horse huh

thats including all the lt1 only stuff....water pump, timing cover, d-port headers


hey dude if you want i got a real good buddy who sells lt1 long and shortblocks...pm me if u want some details...

doc

I may be mistaken, BUT, the LT1 and LT4 heads are reverse cooling heads as well as the LT1 block. The cooling passages for the LT1 engine are different than our L98 stuff.

I believe that LT1 heads will NOT work on an L98 block.

John Millican

iTrader: (1)

You are correct about the reverse cooling.

You are incorrect saying they cannot be used on a L98 block.

Modification is required though, nothing too drastic though.

Ed Maher

While if you have the means, i am sure LT1 heads aren't a bad option, if you actually have to pay to have the machine work done, i would put dollars to donuts that you'll come out way ahead if you just run regular SBC heads and call it a day. LT1 heads are not that much better than AL L98s, which don't cost much more, and require no modifications.

86irocL98

yea i picked up fully done heads...i just need to get a set of guideplates...not to hard...and some minor coolant passage modification...also got Lt1 valve covers...nicer looking by far, got the Lt1 fuel rail cover, grand sport throttle body *plate*, ported throttle body and the intake manifold is supposedly ported for a buy it now of 799.99....and i will be picking them up next week....guy lives a town over...

86irocL98

[QUOTE]Originally posted by f-crazy
[B]i bought an lt1 shortblock for 400 bucks...it needs to be re-ringed and bearings...and i bought some ported lt4 heads and a carbed lt4 intake...

fully assmebled ill have about 2,400 in to it....not to bad for 450 horse huh

thats including all the lt1 only stuff....water pump, timing cover, d-port headers


What headers are you using? i have my SLP 1 5/8" headers up for sale so i will need a new set? ...would any D port headers bolt right in?
-thx

rockind78

Ditto this with one slight change. I wouldn't use the L98's. There are other STOCK heads that flow better.

http://www.malcams.com/legacy/misc/headflow.htm
http://www.geocities.com/classyfella/flow/index.html

Ace

iTrader: (2)

I just got a set of these heads dropped in my lap so I read up on this tonight... i have both sets of heads (old and new), the lt1s fit great on the block and there doesnt look like that much to do as far as machining, if theres a place around here that can do it..

http://www.lt1intake.com/LT1_retrofit.htm .. anyone have a bigger scan of this more detail?

the only problem i see is with the lt1 heads there are no oil drain reliefs on the corners of the head and oil will build up there once you epoxy that coolant tube in there .. there is nothing that addresses this in the article that was posted about the conversion... is this nothing to worry about? if not im taking them down to see if the shop can do it..

fill the 4 passages, drill a couple holes, drill out/tap 12 holes..

anything advice with the oil hole there?

John Millican

iTrader: (1)

If you run a LT1 intake you won't even need to drill/tap the 12 holes. Very easy conversion then.

No idea about the oil drain reliefs.

I don't know anywhere that has a bigger scan then the one I posted in the link. If fact I 'borrowed' those pictures from someone very nice on this board.

If you save the pictures to your computer and then print them, they should print to a full size pice of paper. That would make reading easier.