LS1 in 1967-1972 Trucks
TECH Enthusiast
Joined: Apr 2004
Posts: 749
Likes: 0
From: Chandler, Arizona
We put an LS1 into my son's 70 GMC. Very nice conversion. Takes motor mount plates and a few other small fab jobs.
1. Motor mount plates (fabbed by Matt Diamond of Gearhead Garaqe in Gilbert, AZ. Do a search and contact him)
2) Had to convert to the 72 cable pull gas pedal (took some fab)
3) Used stock radiator, had to fab an elbow to run the steam lines back into
4) Fabbed the mounts to mount the LS1 fans/shroud to the stock 70 radiator
5) Used all new instruments (electronic speedo, oil presure gage, etc.)
6) Sent the engine harness to Speartech (These guys are fantastic)
7) Used a Walbro 255 inline pump and the 99 Vette filter/regulator (had to fab/braze a return line to the tank)
8) Used a new B&M cable shifter
Overall it will run you around $4000 plus the cost of the motor/trans plus whatever labor you don't do yourself.
1. Motor mount plates (fabbed by Matt Diamond of Gearhead Garaqe in Gilbert, AZ. Do a search and contact him)
2) Had to convert to the 72 cable pull gas pedal (took some fab)
3) Used stock radiator, had to fab an elbow to run the steam lines back into
4) Fabbed the mounts to mount the LS1 fans/shroud to the stock 70 radiator
5) Used all new instruments (electronic speedo, oil presure gage, etc.)
6) Sent the engine harness to Speartech (These guys are fantastic)
7) Used a Walbro 255 inline pump and the 99 Vette filter/regulator (had to fab/braze a return line to the tank)
8) Used a new B&M cable shifter
Overall it will run you around $4000 plus the cost of the motor/trans plus whatever labor you don't do yourself.
On The Tree
Joined: Oct 2004
Posts: 131
Likes: 3
Of course, the result is very much worth it (that's my dad, heh).
I took about 200 pictures of the process... click here.
The only real issue I keep running into with it is a lack of traction (I've never had to deal with axle hop before!) and the power steering hoses keep leaking. Shouldn't be too hard to fix finally, though.
I took about 200 pictures of the process... click here.
The only real issue I keep running into with it is a lack of traction (I've never had to deal with axle hop before!) and the power steering hoses keep leaking. Shouldn't be too hard to fix finally, though.
guys I am in the intial stages of the conversion into my 68 PU I hope the end results are worth it. I am sure they will be. My bigest hangup that I see is the headers. I will try a set for a Camaro I understand they may work with only slight modifications.
I will try to keep you posted.
Dave
I will try to keep you posted.
Dave
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TECH Enthusiast
Joined: Apr 2004
Posts: 749
Likes: 0
From: Chandler, Arizona
We couldn't get Camaro headers to fit the 70 GMC. We tried Jet Hot (Hooker copies). They kicked out at the bottom right into the frame. You may try LANES (search here on the board), he has some nice ones for a Chevy II that should fit. We ended up using Hooker Shorties.
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Teching In
Joined: Oct 2003
Posts: 5
Likes: 0
I used the hooker long tubes on my 67 C10. I did have to get creative and cut off the collector on the drivers side and weld on a new one at a different angle.. i guess it depends on how much fabricating you can stand. The passenger side required some slight grinding on the upper frame rail to clear.
