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#1
12-29-2006, 06:58 PM
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Re: 350 LT1 compression...Lower it?
What head gaskets are you using ?? there is a HUGE difference right there.... the stockers were .020 compressed, you can use the .039 FelPro gasket and be just fine with the stock pistons, 93 gas, and 34* total timing..set the initial at 14* and put 10 basic in the distributor curve and that'll give ya 34* total. It'll run perfect.... my LT-1 is 14.95-1 and I kinda like that myself...
JH
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aka - Mighty Mouse 
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#2
12-29-2006, 07:03 PM
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Re: 350 LT1 compression...Lower it?
------WOW!!!!!! Jim,,,,That thing has got to crackle. Anybody indexing plugs down there???......Bill S
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#3
12-29-2006, 07:13 PM
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Re: 350 LT1 compression...Lower it?
Our L78 runs fine on 91-93 gas as does our '70 455 Pontiac. I think the key is a curve as mentioned above and possibly run slightly rich. 40 degrees was fine for 102 grade gas. These cams bleed off quite a bit of cylincer pressure. More cam would help the situation more.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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#4
12-29-2006, 07:18 PM
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Re: 350 LT1 compression...Lower it?
Jim, when you say the 'stockers were .020 compressed' were you referring to the steel shim gaskets? I reinstalled the steel shim gaskets on mine, I think they were .018'ish ??
I think Keith is right, these cams bleed off a lot of the cylinder pressure so pinging is not too big of a problem - especially if you turn the timing back a little. I found that running 93 and turning the timing back a bit significantly altered the 'seat of the pants' performance, but... could've been in my head 
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Marlin 70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride) 69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride) 67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride)
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#6
12-29-2006, 08:34 PM
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Re: 350 LT1 compression...Lower it?
I don't think they ever got to .018 unless it was an early editions...
indexing plugs??? uhhhh, hell yeah, usually takes me 20 to get 8 to line up right, so I buy 50 at a time to get maybe 3 sets.. crackle ??? yeah, it's got a tad of a pop to it  at 7400 it doesn't crackle, but dammmmmmmm does it sound good....there is no better music than an x pipe exhaust and a small block at 7400...
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aka - Mighty Mouse
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#7
12-29-2006, 08:38 PM
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Re: 350 LT1 compression...Lower it?
Hell no, I don't quite understand why everyone lowers the compression and yet is so worried about the car being 100% original, numbers matching, as rolled off the assembly line. we like them because they were hi compression, great sounding, running, and a little crazy at times.. don't lower it is my vote!
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