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Author Topic:   LT1 ?
Dixon
Member
posted September 10, 2003 08:29 PM
My Dad has a '95 Firebird with an LT1. A couple of weeks ago it spun a rod bearing and since it had over 150,000 miles he decided to just replace the motor altogether with a new one. Anyway, the core for the old motor wasn't much so he let me have it. I know the heads are great, but I don't know about the compatibility of intakes with that head and block combination. A buddy of mine said that vortec stuff will bolt up, but I don't think he's right. Anybody know about this? I'd like to try to turn it into a race motor. (I know about the reverse cooling issue).


sbc350
Member
posted September 10, 2003 09:30 PM
The LT1's that came in Camaro's, Fireirds, and Impala SS have reverse flow cooling system. You may want to go to a camaro/f-body forum and ask the question. Those guys know everything about those engines.


rico 08
Member
posted September 11, 2003 08:00 AM
The reverse cooling thing was so big that chevy actually listened to Smokey Yunick and redesigned the small block to try it,i don't think it made much of a difference 'cause they went back and made the vortec with standard cooling.I'm not even sure if they make a carbureted intake for it.The rods/pistons and other internal parts will work on other engines tho.


BrianW
Member
posted September 11, 2003 10:31 PM
I'd like to know if you find an answer! I've seen these heads really cheap off of the Camaro's and even Impala's....


jay116
Member
posted September 12, 2003 07:03 AM
I have an 87 cop car and it has the new style heads with the center bolts at 72 degrees making it easy to get to them with the torque wrench. It came with a carb.
So I am saying find a taxi in the scrap yard it will have a manifold that will bolt to your heads.


Raz_900
Member
posted September 12, 2003 09:16 AM
The LT1 rods are said to be as strong or stronger than 'pink' or 'x' rods right out of the box. Although the blocks were all 2 bolts unless it was in a 'vette. I'd very seriously recommened a main cap girdle or splayed capping it. Late model blocks are a little flimsy when pushed too far over 6000 rpm for any extended amount of time.

They also had the distributor behind the waterpump driver off a little gear that runs off the cam gear. I can't remember if the standard distributor hole was there or not. I think it was and just had an oil pump drive in there. The LT1 distributor setups were prone to failing, so a standard HEI would be more reliable (and cheaper) for racing.

The block's also setup for a roller cam. If you can't run one, you'll need to come up with a flat tappet that'll work. The timing chain setup may be an issue.

Good luck.

Dixon
Member
posted September 15, 2003 12:36 PM
I appreciate all the info, but does anyone know more about compatibility with intakes?


dirtracer7
Member
posted September 17, 2003 07:25 AM
try this place read the flow comparisons ,got this from another posthttp://www.chevyhiperformance.com/techarticles/


Dixon
Member
posted September 17, 2003 02:27 PM
That tech article had some good info, but I'm still wondering about intakes. Does anybody know?


KSGerry
Member
posted September 17, 2003 05:01 PM
I believe the LT-1 and LS-1 are electronic fuel injected only with individual runners going to the intake ports on the head. No one makes an aftermarket carbureted version and other GM parts will not work.

------------------
KSGerry


Dixon
Member
posted September 17, 2003 11:54 PM
I know GMPP makes a High-rise dual plane intake (Part #24502592) for LT-1's, but does anyone know if Vortec stuff will bolt up? I was also wondering about aftermarket possibilities.
I guess this just might have to stay a street motor.


RCRacing #08
Member
posted September 21, 2003 06:26 AM
yes you can find a carb intake, just go to the junk yard and look at some cop car or taxi's like Jay116 said


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