few ?s on ls2 clearancing and mpg
10-02-2007, 10:38 AM
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few ?s on ls2 clearancing and mpg Just picked up my new ls2 block from michigan. It sure is pretty. Now its on to pick a crank. What is the biggest crank that one can put in these blocks without clearancing? I searched the forums but came up with conflicting reports. I'm really looking hard at a mild na 402.
On a different note, since this motor will be daily driven, I'd like to see what others are getting as far as gas mileage on the 402's and 413s.
Thanks for any input since this is still all new to me.
On a different note, since this motor will be daily driven, I'd like to see what others are getting as far as gas mileage on the 402's and 413s.
Thanks for any input since this is still all new to me.
10-02-2007, 11:45 AM
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depending on what rods you go with and what rod bolts are used really. I have seen some 4 inch stroke setups go together that didn't require any block clearancing, but on some others the block had to be clearanced alot (like my motor)
Clearancing the block isn't a big deal, you just have to be careful when you do it, only remove what is nessassary.
Clearancing the block isn't a big deal, you just have to be careful when you do it, only remove what is nessassary.
10-03-2007, 02:04 PM
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what about mpg? Its not a big deal, but I just want to look at my options. I usually work with sbc 350's and I know the 383 on up are gas hogs. I was just wondering if all the great fuel economy that the ls series makes is negated when one ups the displacement. Of course its going to go down but how much are we talking? As said before I'd be going with a pretty mild cam that liked down low rpms.
10-03-2007, 04:47 PM
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Thanks if its any help this will be going through a t56 (.5 ratio 6th) and a 3.9 gears. Thats the reason for the mild cam and probably smaller heads (eventually go to probably a AFR 205 setup when funds allow). This project is going into my 69 camaro when its all said and done so it will weigh less than your average fourth gen.
Before I started restoring it, the car weighed around 3300 with an all iron engine and pg tranny. I'm thinking it will be a little lighter than that so that should help mpg as well.
Before I started restoring it, the car weighed around 3300 with an all iron engine and pg tranny. I'm thinking it will be a little lighter than that so that should help mpg as well.
