LT1 intake vs pre LT1 intake differences?
LT1 intake vs pre LT1 intake differences? I know that the 92 & up LT1 has a different intake than the earlier Chevy engines. But what is the real difference in the heads/intake? Is it a difference in the angle that the intake sits on the heads? A different bolt pattern? Or a different bolt pattern and angle? Also, is the 96-99 Vortec truck heads the same intake layout as the LT1? I know that GM has a carbed LT1 intake but is there any other intake that bolts onto the 92-97 LT1 engines like the Vortec intakes?
Originally Posted by JL8Jeff
I know that the 92 & up LT1 has a different intake than the earlier Chevy engines. But what is the real difference in the heads/intake? Is it a difference in the angle that the intake sits on the heads? A different bolt pattern? Or a different bolt pattern and angle? Also, is the 96-99 Vortec truck heads the same intake layout as the LT1? I know that GM has a carbed LT1 intake but is there any other intake that bolts onto the 92-97 LT1 engines like the Vortec intakes?
The Vortec heads are based on the LT1 heads, they arent the same. They dont have reverse flow. plus they arent aluminum.
Originally Posted by JL8Jeff
I know that the 92 & up LT1 has a different intake than the earlier Chevy engines. But what is the real difference in the heads/intake? Is it a difference in the angle that the intake sits on the heads? A different bolt pattern? Or a different bolt pattern and angle? Also, is the 96-99 Vortec truck heads the same intake layout as the LT1? I know that GM has a carbed LT1 intake but is there any other intake that bolts onto the 92-97 LT1 engines like the Vortec intakes?
1. The bolt pattern is different, even from 87-up heads. The only bolt holes on an LT1 intake that will line up with standard small block heads are the ones at all four corners.
2. The LT1 intake is a standard 23* mount like all the previous years, BUT the angles that the bolt holes were drilled are different than that of the pre-87 heads.
3. The LT1 manifold is a dry manifold, meaning that there are no coolant passages that allow water to flow from the head on one side of the engine to the other.
4. Vortec heads will not fit an LTx intake for two reasons: (a) because the intake mating flange on an LT1 intake is too narrow to cover the tall ports on the Vortec head, and (b) even though the LT4 mating flange is tall enough to cover the ports on a Vortec, the bolt holes are drilled higher in the head than on the intake, making them mismatched.
5. If you're looking to do a conversion, you can run Fastburn heads which are based off the Vortech castings, but are drilled for both the Vortech intake bolt pattern and the standard SBC bolt pattern. This site has all the info on what's necessary to do the conversion: www.lt1intake.com
Actually, I was looking into putting an intake for the older Chevy onto an LT1 engine and wondered if it was possible with the LT1 heads. And if not, would the Vortec or Fastburn heads work on an LT1 with an older style intake.
Originally Posted by JL8Jeff
Actually, I was looking into putting an intake for the older Chevy onto an LT1 engine and wondered if it was possible with the LT1 heads.
GM also makes this intake which will bolt right up to LT1 heads:
http://store.jandjspeedshop.com/prod...roducts_id=156
Originally Posted by JL8Jeff
And if not, would the Vortec or Fastburn heads work on an LT1 with an older style intake
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Originally Posted by NoMoreLS1
I used the Accel fuel injection manifold that is used to convert the old style SBC engines to fuel injection. The intake was modified to work with the LT1 heads.
MAN dude that looks WICKED!
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Originally Posted by 93turboLT1
How does that Accel intake compare to a stock Lt1 say if i was going to use it N/A. (flow rates, torque gains...high or low) Will that intake increase high rpm power?
