GM 8.1L engine
Re: GM 8.1L engine No one makes an aftermarket head for that motor. We could do some port work on your heads, some bigger valves and get you a custom cam. What are you building it for? And what are you looking to get out of it.
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Re: GM 8.1L engine port work? are you kidding? did ya not notice that you can fit your whole hand in those suckers?? 
IMO all you'd really need to seriously wake up one of those motors would be a killer set of headers and a decent sized cam. then you could spray it. ;D
IMO all you'd really need to seriously wake up one of those motors would be a killer set of headers and a decent sized cam. then you could spray it. ;D
Re: GM 8.1L engine Arizona Speed & Marine makes an awesome looking intake manifold for the 8.1L, you should check them out and see what else they might have. 
Check out TByrne for pricing and other 8.1L stuff.
Ryan
Check out TByrne for pricing and other 8.1L stuff.
Ryan
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Teching In
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From: Michigan
Re: GM 8.1L engine well actually, im thinking of dropping an 8.1 into a tahoe, but i want something that's a little more potent than usual. What i want isnt a towing engine, but something that will be at least as fast as a grand cherokee 5.9. I wanna be able to keep up with some 'stangs off a light 
. So you think headers, a cam, new rockers, and a good exhaust would do it? what kind of numbers would be possible?
. So you think headers, a cam, new rockers, and a good exhaust would do it? what kind of numbers would be possible? Trending Topics
Launching!
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From: texas unfortunately for now
Re: GM 8.1L engine those cherokee 5.9 are sick. a friend of mine has one in the platinum color. we used so mach it to Lake Tahoe to go riding in the winter from the Bay Area and get to north shore in like 2 hours. normally a 3 1/2 hour trip. pretty quick for a SUV.
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Teching In
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From: Michigan
Re: GM 8.1L engine
I thought the 8.1 was a tradional BBC, and would accept most aftermarket BBC heads???
Re: GM 8.1L engine Save yourself some money and buy a WHIPPLE SUPERCHARGER or one from KENNE BELL they work great what year tahoe although it does not matter
by the time you get all the parts etc... you will save yourself a lot of time ad aggrivation if somethig does not work right. I had sell them and
I have built motors over all the blower is cheaper and it is a true bolt on item. I had one on my 96 truck swb reg cab 350 with 100K a whipple and jba headers I ran 6 back to bak 13.80x @98 mph they have great tourque to get out of the hole and on my 2001 truck I had one they work great for what you are trying to do. That is my .02! Good luck on what ever you decide!
by the time you get all the parts etc... you will save yourself a lot of time ad aggrivation if somethig does not work right. I had sell them and
I have built motors over all the blower is cheaper and it is a true bolt on item. I had one on my 96 truck swb reg cab 350 with 100K a whipple and jba headers I ran 6 back to bak 13.80x @98 mph they have great tourque to get out of the hole and on my 2001 truck I had one they work great for what you are trying to do. That is my .02! Good luck on what ever you decide!
Re: GM 8.1L engine
I thought the 8.1 was a tradional BBC, and would accept most aftermarket BBC heads???
Re: GM 8.1L engine
I thought the 8.1 was a tradional BBC, and would accept most aftermarket BBC heads???
This article says it's built off the old big block stucture under hightlights a few paragraphs down.
http://www.new-cars.com/2002/chevrol...verado-hd.html
Re: GM 8.1L engine Fast Ls1 is right. The engine is based on the old BBC style motor it has a few differences on the crank seal and the heads are different the old heads will not work on the newer blocks ETC... But the design is very close to the traditional BBC.
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From: Native Texan
Re: GM 8.1L engine The new 8.1 has cathedral ports as was stated in a previous post and also has a revised firing order (same as the LS1) and has a longer stroke 4.37 Vs the 454 that has 4 in stroke. There are a few other minor differences.
Re: GM 8.1L engine
ohh man you think an 8.1l will fit in an 00 corvette, seriously I need more power
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From: Azle/Saginaw, Tx
Re: GM 8.1L engine hell, if the 8.1 has LS1 based heads because of it's "cathedral" style intake ports, then the LS1 has old school Cadillac roots from the old 472 and 500 CI motors, the old caddy motors had the same type intake ports 20 years ago
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Teching In
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From: Michigan
Re: GM 8.1L engine 8.1 will fit in a corvette, in fact i have a magazine where a guy dropped one in a navy blue vert, but extensive mods were necessary as far as the steering rack, etc.