Gauging Interest in "BIG" CID LT1 Block
04-15-2009, 12:42 PM
#141
Well GM made 5 big block LT1/4's, a friend just got number 1 of 5 yesterday. It is a factory 4.025 bore, billet mains, and utilizes opti-spark, LT style cam, head bolt pattern, and intake bolt pattern. I have pics but not sure how to post them. If you would like to see them please pm me.
do you have links to the LT1 block you mentioned?
04-15-2009, 01:58 PM
#142
Most likely one of the fabled "GM Raceshop" blocks. From what i've read on the net, they made more than 5 of them though. Not a lot in total, but definetly more than 5 of them. There was one on ebay not too long ago.
How big (CI) can the GM "raceblock" be setup.
04-15-2009, 04:02 PM
#145
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If I'm not mistaken it can be pushed to a 496ci...If you look at the pics you can tell it originally used a BBC cam, and they used bushings to run the LT cam. It is also a siamese bore like the LS series.
04-15-2009, 05:14 PM
#146
Unless the cam centerline and deck is raised and the pan rails are pushed out, I doubt it would go 496. At 4.185 bore, that would require a 4.507" stroke. With the stock deck height, you would have to sandwich the rings into a 0.3" section at the top of the piston, assuming a 6" rod (which would still have a terrible rod ratio).
04-15-2009, 07:42 PM
#147
No, not even close to that. It is a 'Bowtie" version of an LT1 block. It is substantially stronger and already bored out near 4.120 iirc.
04-15-2009, 07:47 PM
#148
Here's a pic of what was on the outside of the crate of the one that was on ebay not too long ago. You can clearly see that it says 4.120" bore, the rest is a little fuzzy, sorry. Maybe someone should go to their local Chevy dealer with the part number, lol.
If you squint it is easier to read.
.
If you squint it is easier to read.
.
04-15-2009, 08:52 PM
#149
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Unless the cam centerline and deck is raised and the pan rails are pushed out, I doubt it would go 496. At 4.185 bore, that would require a 4.507" stroke. With the stock deck height, you would have to sandwich the rings into a 0.3" section at the top of the piston, assuming a 6" rod (which would still have a terrible rod ratio).
Last edited by proelky; 04-15-2009 at 10:27 PM.
04-15-2009, 10:30 PM
#150
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If you will look at the pics posted you will notice our block is 4.025. Also, last time I checked LT's are not a siamese bore. The "Bowtie" block is not closely related to the LT block aside from a couple characteristics.
04-16-2009, 05:58 AM
#151
How did your friend acquire it?
How much did he pay?
Shoot me a pm if you could please!
10-13-2009, 09:07 PM
#154
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I'd cut them a check tonight for a 502+ inch platform. I'm thinking force fed + big inches = broken parts. =0
I'll need to build up my drivetrain a bit more
Sounds like fun! Traction may be an issue...
This option will sap my savings of at least another 70K if it becomes available. I'm not holding my breath though. I don't see a high demand for such an option from DART. Only if you were willing to pay an exorbitant premium for being unique yet competitive in the 1/4 mile would you drop the kind of dough needed to build and keep a car together with a big inch LT1 engine build. Sponsors perhaps...?
I'll need to build up my drivetrain a bit more
Sounds like fun! Traction may be an issue...This option will sap my savings of at least another 70K if it becomes available. I'm not holding my breath though. I don't see a high demand for such an option from DART. Only if you were willing to pay an exorbitant premium for being unique yet competitive in the 1/4 mile would you drop the kind of dough needed to build and keep a car together with a big inch LT1 engine build. Sponsors perhaps...?
Last edited by thedue; 10-13-2009 at 09:23 PM.
10-24-2012, 01:53 PM
#156
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10-26-2012, 04:51 AM
#159
I'd take one also........ and take one as soon as they came out if I could use my internals that I have already.
6 bolt mains to ward off crank walk or some way to fix that issue for 1k+ hp and better head clamping force for more boost.
6 bolt mains to ward off crank walk or some way to fix that issue for 1k+ hp and better head clamping force for more boost.
