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Author Topic:   327 engine?
Dirt Full Roller

Total posts: 37
posted March 11, 2005 08:53 PM  
I just got a motor i need some help with the block is a 3914678 which is a 327? and the crank is a 3911001 3.25 stroke and the pistons are 4 valve relief flattops that are gm marked with part number 37957704 does any one know anything about this combination is it stock? and I have a set of 305 heads 601 castings 53cc? would this be a good combination to run for a purestock w/2bbl and what kind of compression would I get out of this with .041 gaskets and .015 shim gaskets thanks to all who can help!

Dirt Freak

Total posts: 477
posted March 12, 2005 04:19 AM  
If you can not find a 350, and your relegated to using a 327, they are not a bad motor. Stock 327 cranks are some what lighter than a 350 crank, but only by a pound or two. If your stuck with cheap stuff, or if you decide to put some money in it, get it balanced. My only knock on 327 is that you must cam it so you can squeeze as much torque out of it as possible, a comp cams # 12-651-5 would be a good cam, it has a 108 center that will work fine, and if the track is tiny just advance the cam 4 degrees, trust me it makes a big difference. It also prefers about a 180 to 185 intake runner on the heads. Mine turned 6,500 tacky, and in extreme wet track cases, 7,000, and it all stayed together. Hope this helps.

Dirt Forum Racer

Total posts: 94
posted March 12, 2005 09:28 AM  
i also would strongly suggest not using shims to control ratio numbers, you need to get a quench around .055, or less. control it with deck hieght, head gasket, and cyl. chamber. Max would be .035, if you have a good valvetrain, valvsprings with the right lift, etc.

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