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  #1 (permalink)  
Old 12-06-2007, 03:19 PM
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LT1 Heads on an older 350

I have a problem that i was wanting to pick the massive amount of gearhead brain cells out there. I do things on the cheap so i found a good set of Lt-1 heads off a 96 TA at pate last year and i have a 92 chevy roller motor that i want to put them on. I know i can buy the intake without the water passages for it but as far as the water pump it doesn't appear that it will bolt on the older block but with the older style water pump it appears i'm one water hole short.I haven't bolted the heads on yet but this is going in a Vega street car so the power will be about all i want and i like the weight reduction of the aluminum. can someone enlighten me? Thanks and happy Rodding!

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Old 12-06-2007, 03:25 PM
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The Chevy LT1 heads will not work on the older non LT1 engine blocks, due to the LT1 having a reverse coolant flow. I have heard of people making them work by drilling passages on the front side of the cyl heads and using some sort of coolant tube set up, but I'm not sure how or even if this is possible.

Steve
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Old 12-08-2007, 09:05 AM
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I was going to put a set of aluminum LT1 heads on a older 350 awhile back and found this tidbit so here you go:


http://www.thirdgen.org/techboard/tp...eads-gen1.html
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Old 12-09-2007, 09:56 PM
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i am no expert but weren't some of the older 350's called LT1s, if so then they might work but don't quote me on that
I know a guy that has a 350 in his 68 impala and that is the same as a LT1 block i think
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Old 12-10-2007, 01:34 PM
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Quote:
Originally Posted by oldsmobilekindofguy
i am no expert but weren't some of the older 350's called LT1s, if so then they might work but don't quote me on that
I know a guy that has a 350 in his 68 impala and that is the same as a LT1 block i think
Yes there were older motors called LT1 but that are not the same. The new LT1 93+ motors use fuel injection, an optispark distributor that runs off of the cam and reverse coolant heads.
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Old 12-10-2007, 01:40 PM
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If you like the idea of aluminum heads check out Edelbrock of Brodix. You can pick up a pair of their heads new for right around $1000 and you'll have no trouble bolting them on to your engine.
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Old 12-12-2007, 08:41 PM
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newer LT1's

yeah guy's i new the reverse flow and the cam drive but like i said i do stuff on the cheap and thought if there is any way with a little machine work. but the camaro board made up my mind.aftermarket it is! thanks for all you guys help
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Old 12-13-2007, 12:49 AM
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I knew one guy who did it. You have to basically weld all the water passages closed, drill new ones, and after thousands of dollars of machine work you have potentially trashed heads from all the welding that flow no better than plain old ordinary chevy heads.

The iron LT1 heads flow as well as vortecs. The aluminum LT1s flow about as well as any good early SBC head. Bolt on vortecs and you'll get the same performance for $400 instead of $3000.
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Old 12-14-2007, 09:44 PM
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Not sure if it doable or not, but I DO know that the FORD 302 guys can put LS1 heads on the ford block and I believe they also deal with the reverse flow. Thye need a custom cam to deal with the reversed valve arrangement.

So I have to think it is possible, but is it a good idea?

Pete
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Old 12-14-2007, 09:49 PM
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Quote:
Originally Posted by NOHOME
Not sure if it doable or not, but I DO know that the FORD 302 guys can put LS1 heads on the ford block and I believe they also deal with the reverse flow.
woah! how do you do that? It might be messing with texas... regardless, it brings a whole new meaning to 'rebel machine'.
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Old 12-14-2007, 10:03 PM
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quick google will take you to some reading on the subject. Not really sure why it is worth the effort when there are good 302 heads, but it proves the point that where there is a will there is a way!

http://forums.stangnet.com/showthread.php?t=730454

Pete
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Old 12-14-2007, 10:13 PM
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Man thats Nuts.....Makes me want to build an LS-F motor
Shane
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Old 02-24-2010, 12:28 AM
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93+ LT1 heads on a Gen 1 sbc

At the time of build, I had a 355 sbc in a nova not working. First I pulled it out and installed Speed pro 10.1 pistons. I bought a zz4 cam 208/221 & .474/.510 along with proper hyd roller lifters. I thought I was ready to go but the heads were ported by a newbie. All the chambers were messed up etc. I decided to get cheap and buy a set of LT1 heads off of a 93 camaro. They bolted up fine yeah but then I noticed the water port problem. I closed the left and right water ports on the heads and continued with build. I installed 1.6 roller rockers and bigger springs on heads along with port and polish. Second problem was intake bolt up lol. I had to drill intake to match up to bolt pattern and angle on bolt. The screws bolt straight up instead of at an anlge like the old school ones. The distributer dropped right in by the way. I used a Holley 300-36 intake (Contender). Third problem here also! I had to close water exit ports to heads on the intake. Since water has to flow threw heads, I drilled 2 holes into the intake to route water to heads. This setup allowed me to use same Thermostat and everything else bolted right up including alternator, power steering pump, etc.

After the build I installed D-port headers and x-pipe to flowmasters.
Results:
PkTq = 463 @ 3800 Avg = 382
PkHp = 412 @ 4850 Avg = 301

If your going to build this MOD you have to run colder plugs on these heads.
Since I installed 10.1 pistons and heads are rated at almost 11:1, I didn't want to risk detonation.
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Old 02-24-2010, 04:20 AM
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I can't help but to say there are LT-1 engines and there are LT1 engines. The former is Gen I, the latter Gen II.
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Old 02-24-2010, 08:31 AM
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Quote:
Originally Posted by curtis73
you have potentially trashed heads from all the welding that flow no better than plain old ordinary chevy heads.

The iron LT1 heads flow as well as vortecs. The aluminum LT1s flow about as well as any good early SBC head.
Im sory but you are wrong, the aluminum LT1 heads are much better than any non vortec 1G heads, period. They employ the same modern chamber design and port layout as the iron LT1 heads, the iron heads have a very slight advantage over the alloy version but not enough to get excited about.
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