Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Old 07-14-2010, 09:56 AM
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Question Plastic Mockup Blocks

Who has used one of the LSX plastic mockup blocks/heads and how did you like it? Was it light enough to move around by hand? Useful?

I am thinking about getting one to help with my swap. I have firewall mounted A/C and I'm thinking the mockup block & heads would help a lot to figure out where I may need to modify things. I don't want to stab & restab the motor a bunch of times if I can avoid it. Any opinions on their usefulness?

Also when using a mockup block, is it important to bolt up the tranny to determine final engine location or are just the motor mounts adequate? It's been a while since I've pulled or stabbed my engine and I can't remember if it moves around a lot when you mate the tranny or if the motor mounts by themselves determine how the engine is angled.

Thanks for any help/advice.
Old 07-14-2010, 01:17 PM
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The plastic block and heads is a lot of money to spend for something you'll probably only use once.
Old 07-14-2010, 01:20 PM
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i use a hollowed out ls1 block. its heavy but its light enuff for me to carry and move around.
Old 07-14-2010, 01:38 PM
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Pulling the engine in and out a couple dozen times is a rite of passage in building your own monster car. Consider it a character building exercise.

Plus it is usually the accessories (like exhaust, alternator, AC etc) that forces the engine to be shifted in one direction or another. I don’t think a plastic block is going to be that detailed.

At some point you are going to want the full engine and trans in place before you set the final motor & trans mounting points. Being able to adjust all three can be crucial in getting the rear diff pinion angles right.
Old 07-14-2010, 02:42 PM
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Originally Posted by Pop N Wood
Pulling the engine in and out a couple dozen times is a rite of passage in building your own monster car. Consider it a character building exercise.
Ha, ha, ha, ha!!! If I had only kept count of the number of times I have done this... do I get a prize or a straight jacket? To paraphrase a quote from Pulp Fiction "just because we ARE characters doesn't mean we have character."


Originally Posted by Pop N Wood
At some point you are going to want the full engine and trans in place before you set the final motor & trans mounting points. Being able to adjust all three can be crucial in getting the rear diff pinion angles right.
The block I saw had metal bosses for all the accessories, heads, valve covers and headers - but at $370 it wasn't economical for the home builder.


Cool to have - yes, necessary - hardly. Depending how well you measure and what your level of experience is you won't have to do it many times.

Since we are talking about expensive one-trick-pony dream tools - does anyone have a set of header legos?
Old 07-14-2010, 05:08 PM
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Put the engine with the trans...
Old 07-14-2010, 05:28 PM
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Before you consider buying one of these blocks, you might want to read this...
http://www.yellowbullet.com/forum/sh...d.php?t=258699
Old 07-14-2010, 06:34 PM
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If you plan on doing several LSx swaps, then buy one, otherwise stick to your engine going in

Why would you have to pull/stab the engine more than a few times?
Old 07-15-2010, 01:46 AM
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Originally Posted by Firehawk441
Before you consider buying one of these blocks, you might want to read this...
http://www.yellowbullet.com/forum/sh...d.php?t=258699
I would read this thread first. Doesnt sound like its worth the headaches...
Old 07-15-2010, 12:14 PM
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I'd look into buying a used one, then resell to somebody else. Should be able to recoup the cost, minus shipping.
Old 07-15-2010, 12:48 PM
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I used a P-Ayr foam block for my project mock up with great results. I held tight tolerances around the oil pan and headers and everything was spot on when it came time for final assembly.



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