408 build cr issue

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01-09-2008, 10:22 AM

#11

joshua022

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Quote:

Originally Posted by Stoichiometric

The stroke should be 4" also.

Quote:

Originally Posted by Simon SS

Thanks for the replies so far. This is what I thought also. I would be at 9.5:1 with the other Eagle kit with the -29cc pistons but I think this is too low...

I'll change the stroke to 4" when I get home, and see what tht changes your DCR and SCR too.

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01-09-2008, 11:01 AM

#12

Simon SS

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No plan to run other type of gas than 94 octane, this is what we get here. We are trying to get some different heads instead...want to keep my high compression.

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01-09-2008, 11:16 AM

#13

TurboBerserker

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You can always get a 4" stroke crank, some 6.125" rods and slugs of your choice - there are tons of 4.030 pistons out there in almost every configuration. You should have many more choices that 11.8:1 and 9.5:1.

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01-09-2008, 02:31 PM

#14

Simon SS

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Yeah I know...I'm just gravitating around the high compression Eagle kit. But good news, I will go with some World Products Cylinder Heads.
http://www.worldcastings.com/prods_p...arhawkls1x.htm

I will be at 10.6:1 with the 72cc. They have 235 cc intake ports!
I am also trying to get my parts from the same local retailer.

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01-09-2008, 02:59 PM

#15

zippy

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I think if you check around over on the LS1Tech side you'll find that much compression is fairly common.

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01-09-2008, 04:10 PM

#16

Simon SS

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Yeah, I'll be on the safe side now. lol

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01-09-2008, 07:29 PM

#17

sleek silverado

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With a 4" stroke on the set up you had the CR would ahve been 13.0:1. It would work in a NASCAR. With the 72cc heads you will have 11.5:1 SCR and a 8.63 DCR. Not too bad. I would think it would run pretty good.