Deck Clearance-SBC 350 Mr. Goodwrench Motor? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-18-2005, 08:08 PM
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Deck Clearance-SBC 350 Mr. Goodwrench Motor?

Has anyone measured, or know this figure for the above crate motor, part #10067353? This is the Universal 1971-1985 350 replacement motor. Uses dished 4 valve aluminum pistons #12514101. I know they vary & I'll measure & average my engine when it arrives. Just trying to do a little CR/quench planning right now.

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Old 04-18-2005, 08:20 PM
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usually it`s around .025, however, if it`s not checked there`s no way to be sure, as many blocks decks are tipped from the factory. if there in the ball park of around .025, then you can use a .028 thickness head gasket or thinner and have decent quench, but a piston change will be in order since full dish pistons have no quench.
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Old 04-19-2005, 07:50 AM
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You will also need a head that has a quench area to get the effect. Not sure of the head design on the goodwrench engine. The vortec head would be a better choice over the non-vortec head.
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Old 04-19-2005, 10:52 AM
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Thanks for the replies. I will be using pocket ported & cleaned up Vortec heads w/valve job,new springs, guides,etc. Head work done by a regular contributor to this site.
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Old 04-20-2005, 11:40 AM
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I haven't measured any Goodwrench engines as of late, but don't be surprised if the pistons are WAY down in the hole. Rebuilder pistons are generally .020 down in the hole if the block is at 9.0" deck height. If you have a 9.025 block (normal for a Chevy), then you will have .045" deck clearance without the gasket, ouch!

Thank God for Fel-Pro .015 shim head gaskets!
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Old 04-20-2005, 02:19 PM
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Quote:
Originally Posted by NAIRB
I haven't measured any Goodwrench engines as of late, but don't be surprised if the pistons are WAY down in the hole. Rebuilder pistons are generally .020 down in the hole if the block is at 9.0" deck height. If you have a 9.025 block (normal for a Chevy), then you will have .045" deck clearance without the gasket, ouch!

Thank God for Fel-Pro .015 shim head gaskets!

The engine he is referring to is a new engine, not rebuilt.
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Old 04-20-2005, 02:38 PM
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I think NARIB meant my pistons MAY be even further down "in the hole" than rebuilder pistons. He knows I'm using a Goodwrench motor.
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Old 04-20-2005, 04:11 PM
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Another thing to keep in mind is that not all strokes on the crankshafts are always exact. I've seen more than a few that are actually .010" shorter. Not all rods are exactly 5.7 center to center length. Add all of these little shortages together and it can make quite a bit of difference.
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