A set of E-Streets or iron heads would add power and be a cheap swap.
L98 Heads
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From: Oakland California
I daily drove a '78 Z28 for five years. I kept it in tip top shape, and that car had more then 100,000 miles on the engine and tranny, 500,000 plus on the chassis. I will Put more thought into it.
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I put L98 heads on my '71 L48 350 in 2005. This engine has stock pistons and the 350 hp cam from 1970 (when rebuilt by previous owner in the early '90s). I noticed a significant increase in power and have had no problems with detonation. I run the highest octane available, and 36° total advance. This was the best upgrade I did on the original engine. I'm pulling the engine out now to be replaced with a new one, but that's because I want to take the power to another level and save the original, numbers matching engine.
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From: Millington Illinois
St. Jude Donor '08-'09
I put L98 heads on my '71 L48 350 in 2005. This engine has stock pistons and the 350 hp cam from 1970 (when rebuilt by previous owner in the early '90s). I noticed a significant increase in power and have had no problems with detonation. I run the highest octane available, and 36° total advance. This was the best upgrade I did on the original engine. I'm pulling the engine out now to be replaced with a new one, but that's because I want to take the power to another level and save the original, numbers matching engine.
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From: Duvall, WA
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if you remember the L-82 uses the 350/350 cam and it had 11.0-1 compression. was that a bad motor? i remember it as an excellent street motor. and that was a very popular street cam for over 20 years.
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St. Jude Donor '08-'09
That was a great motor. As I stated earlier in the thread it might work. The factory cams had really lazy ramps which closes the intake valve later bleeding off more cylinder pressure. Premium fuel back then was 100 octane and those engines used premium.
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From: Austin TX
I believe you are thinking of the original LT-1 engine (11:1, solid lifter). The L82 had lower compression of 9:1 (not sure what cam)
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From: Oxford MA-----You just lost the game!!!!
Scott
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LOL!! You think you have caught somebody in a mistake, but it is, in fact, you who are mistaken!!!!! In all fairness, the post you quoted from could have been more clearly written. What he was getting at was that the L82 used the same cam as the L46 (commonly referred to as the 350/350 for it's cubic inch displacement/gross horsepower rating) and the only real difference between the L82 and L46 was 2 points of compression ratio (L46 had 11:1) In other words, an L82 is an L46 with less compression, and just look what that one small change did to it.
Scott
Scott
I put L98 heads on my '71 L48 350 in 2005. This engine has stock pistons and the 350 hp cam from 1970 (when rebuilt by previous owner in the early '90s). I noticed a significant increase in power and have had no problems with detonation. I run the highest octane available, and 36° total advance. This was the best upgrade I did on the original engine. I'm pulling the engine out now to be replaced with a new one, but that's because I want to take the power to another level and save the original, numbers matching engine.
63mako agrees, but states that that head would give 11.2 compression on an L82 (and would need a big cam to bleed some off some compression, but that big cam might make it "too" much for a street engine.)
7t9l82 states the L82 had the same cam (350/350), but "11.0-1" compression, but remembers the L82 as an excellent street motor. (referencing 63mako's statement about 11.2 compression with L98 heads being problematic, in his opinion).
Last edited by AirBusPilot; Jan 24, 2012 at 04:46 PM.
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From: Oxford MA-----You just lost the game!!!!
I think what was trying to say was that the L82 used the L46 cam, and the L46 had 11:1 CR and was a good street motor. I know it doesn't read that way, but I think that's what he was trying to convey.
Scott
Scott
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From: Millington Illinois
St. Jude Donor '08-'09
That is the way I read it and responded. But the premium gas available when the1969-1970 L46 11to 1 compression motor was built was 100 octane. I think the sunoco was 104. Now all you can get is 93 or 91. It might work with aluminum heads, .040 quench and the L82 cam. If you try to use a modern cam grind you will just have to go too high in duration to be a good street engine..
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St. Jude Donor '08-'09
The 1094 was my recomendation and it is a felpro number, rubber coated steel shim. It has been used on thousands of aluminum head upgrades on stock blocks and I have never experienced or heard of any sealing problems with them.???? Oh, and there is no freekin way to accurately measure piston volume with the short block in the car with plexiglass. You could probably fill the recess with clay, carefully flush it with the top of the piston with a straight edge, remove the clay and measure the displacement of the clay in a graduated beaker partially full of water but if you really want to know ask. It is 13cc
Last edited by H P Bushrod; Jan 25, 2012 at 11:44 AM.
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Guys, I'm starting to collect parts for an LS1 and T56 swap. I'm thinking about collecting parts little by little and eventually do an LS swap. I work at O'Reilly Auto Parts, and have access to parts at a good price, so I will go from there. I have also been reading through threads on this forum, as well as in the LS1tech forum. I also have the book "How to swap an LS..." and have been studying this book for a good amount of time now. My friend owns a shop, so I will have access to a lift, welder, plasma cutter, etc... My plans are to gather as much info and start a thread with the step by step process of the swap, and also the parts list for the swap. I'm going to go with the Vetteworks adapter plates, and have already gotten the 99+ Corvette fuel filter. I'll keep you guys posted.
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From: San Jose CA
I can help you with the ECM side of things, removing VATs and dialing in the MAP and MAF sensors.
Once you have the ECM hooked up in the car, let me know and I can come set up for you. Buy me gas & lunch and pay for the HPTuners credits ($100) and we'll be good to go.
Once you have the ECM hooked up in the car, let me know and I can come set up for you. Buy me gas & lunch and pay for the HPTuners credits ($100) and we'll be good to go.
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Safety Car
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From: Oakland California
I can help you with the ECM side of things, removing VATs and dialing in the MAP and MAF sensors.
Once you have the ECM hooked up in the car, let me know and I can come set up for you. Buy me gas & lunch and pay for the HPTuners credits ($100) and we'll be good to go.
Once you have the ECM hooked up in the car, let me know and I can come set up for you. Buy me gas & lunch and pay for the HPTuners credits ($100) and we'll be good to go.
. I'm going to gather the parts up and let you know. Thank you very much for your help.
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Safety Car
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I saw a craigslist add for complete, fully dressed, LS1, Harness, ECU, dual fans(F-body)and T56 for $2500, but the guy didn't get back to me. I guess I'll have to keep looking.
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Don't discount the LQ4s, although it sucks to have an iron block you can make BIG horsepower for cheap out of them.
LQ4 is a 6.0, so you can put the L92 heads and intake on, which will get you an (iron block) LS3 with 0.2L less displacement.
Good shape LQ4s can be found for <$1k, although a hair more with harnesses.
LQ4 is a 6.0, so you can put the L92 heads and intake on, which will get you an (iron block) LS3 with 0.2L less displacement.
Good shape LQ4s can be found for <$1k, although a hair more with harnesses.
Thread Starter
Safety Car
Joined: Mar 2009
Posts: 3,558
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From: Oakland California
Don't discount the LQ4s, although it sucks to have an iron block you can make BIG horsepower for cheap out of them.
LQ4 is a 6.0, so you can put the L92 heads and intake on, which will get you an (iron block) LS3 with 0.2L less displacement.
Good shape LQ4s can be found for <$1k, although a hair more with harnesses.
LQ4 is a 6.0, so you can put the L92 heads and intake on, which will get you an (iron block) LS3 with 0.2L less displacement.
Good shape LQ4s can be found for <$1k, although a hair more with harnesses.
