355 w/ 6-71, are gm internals enough?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-29-2004, 05:05 PM
84Z 84Z is offline
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355 w/ 6-71, are gm internals enough??

There's an engine around me that's a 355 with a 6-71 blower on it. The engine has 7.5:1 compression with a GM steel crank and the rods are polished, shot peened, floated and new ARP bolts, the pistons are TRW forged. Heads are stock with port job, 76 cc chamber. cam has like .5 lift intake and .52 exaust durations 238 and 248. Blower is set up for 10-12 boost, power curve ends at 6k rpms. Carbs are dual 600 cfm. O and the engine is a 4 bolt main. Will this engine work well? It won't blow up or anything? Thanks.

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Old 03-29-2004, 06:59 PM
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let it lean out, or detonation set in, any engine will blow regardless of what internals it has. If your looking at buying it, I`d want proof the engine has in it what it says it has, if it don`t the fun won`t last long. steel cranks work fine, but if the rods are stock and just polished, I wouldn`t trust them.
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Old 03-29-2004, 07:37 PM
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I had a 377 many years ago based on a stock 400 block w/ a 350 crank. The rest of the rotating assembly was about the same. I had pretty good cast iron heads with moderate port work and large headers with side pipes on a '74 Corvette. I under-drove the 6-71 some and netted about 6 psi of boost. WAY too much power for a street car (thats saying something considering I was in my 20's). Now I have a measly alum head 572CI BBC on the engine stand for my '67 Pickup and I hope I have the same problem! The 'vette also had a built TH400 and a modified GM limited slip unit in the stock rear end. It used the original half shafts but a custom drive shaft from someone in Pasadena (too long ago to remember who). I broke a couple of half shaft u-joints hitting second real solid so the torque potential is really there. Make sure you don't jet it too lean and use narrow enough tires that will give a little and spin before the trans or rear end shatters. Not as quick but cheaper than replacing a bunch of busted marginal equipment. It worked for me anyway! If you get it, I hope you enjoy it! Let us know...
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