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400 sbc 60 over too much?

Old 04-12-2012, 01:06 PM
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Originally Posted by snapmorgan
I wouldn't do it. i built lots of 400's back in the day for stock cars. Had problems with .040 blocks running hot. It will not last with the short rods, needs at least 6" rods, and you have no more room to bore it. The stock blocks crack through the steam holes and you also have to drill holes in the heads which make them prone to cracking. I would not build a boat engine with a stock 400 block unless it was standard bore, which you will never find. I think it will be a waste of $3K and probably ruin your summer.
I found one a few years back bone stock bore and had it punched 30. Kid was gonna junk it cause it wasn't a 4 bolt. Better yet it was a pre 73 2 bolt with 3 freeze plugs per side. I gave $40 for it LOL

I got it lubed and sitting waiting for something to build it for.
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Old 04-13-2012, 09:40 AM
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Originally Posted by sankanother1
I depends on the build. I run a 1050 cfm on a 409 small block.But thats with 245 cfm heads with 725 lift and 13,1 compression..600 cfm will run fine but you wont get the potential horsepower from it.650 dp is what you probably want but I am guessing since I dont know your build.
xactly what I was thinking, but it has been years since I worked on car motors, Fuel injected outboards for me now
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Old 04-13-2012, 02:06 PM
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Originally Posted by chrisf695
Im giving him the ok to build the motor, he said the overheating wont be a problem because of the cool water that will be constant through the block. I guess we'll see... motor should be built in a week hes telling me.

It's 2 days shy of a month now.

Have you got an update for us?




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Old 08-02-2012, 10:24 AM
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Wondering how this project turned out. No very well i would guess.
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Old 08-02-2012, 11:15 AM
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Sorrry for no updates...

The project actually turned out great, I was wrong with it being .60 over, it was .40 over which makes a 408. Got 425 hp out of it, tons of torque. Ive put about 40 hours on it so far this year with no overheating issues at all. So im happy with the motor, the builder gave me a 2 year warranty on the motor and work. But i have another problem going on with a small crack in the fiberglass by the motor mount... still investigating on it. It seems to be very solid still but im having a surveyor come out tomorrow to test it.
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Old 08-02-2012, 12:12 PM
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Glad to hear it worked out well.
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Old 08-02-2012, 12:20 PM
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I ran twin 406's in my 28 Cigarette for 22 seasons of racing. They were great. 5.7 rods, world heads. They made right around 425HP. The torque is what I wanted for the heavy Cigarette. It would run close to 80mph all day.
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Old 08-02-2012, 12:26 PM
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Originally Posted by CIG3
I ran twin 406's in my 28 Cigarette for 22 seasons of racing. They were great. 5.7 rods, world heads. They made right around 425HP. The torque is what I wanted for the heavy Cigarette. It would run close to 80mph all day.
Same here... 5.7's, using iron eagle heads, forged crank and rods, comp cam. So far its been a great motor. Love the sound it makes too! Sounds like a BBC.

Last edited by chrisf695; 08-02-2012 at 12:36 PM.
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