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12/31/10 8:38pm - Original Message: 'Help with motor choices'
rod7515 Lifetime Member
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Red Lion, PA - USA

1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1180
I found out today that the 350 4 bolt main block I bought for my 72 has a small crack just above the lifter area. So now I need another block. My plan is to go with a stroked engine so a 4 bolt is really my preference and it will get bored 30 over. I would like to hear your thoughts about my choices. 
1. Search for another block (took 3 weeks to find the last one)
2. use the original numbers matching that is in the car now. (didnt really want to do that)
3. remove the oil pan from my original 74 numbers matching engine and if its a 4 bolt use it.

The 74 engine is just sitting there and will probably never go back in. Of course theres no guarantee that its a 4 bolt main either. Knowing that the 74 resale value is not as good as a 72, I am thinking about going that way. I know the block is good and thats all I really need.
I didnt give that much for the bad block ($100) to chase the guy down. Its about a 2 hour drive and the only reason I bought it was my neighbors family lived about 5 minutes from the guys house so they picked it up for me and brought it to me. I have sold the heads ($35) from it and plan on using the rods so its not that much of a loss. 
Looking forward to your thoughts! Maybe someone has a better idea!
rod75152010-12-31 17:41:27


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1/1/11 11:14am - Reply: 'Help with motor choices'
lukesvette Lifetime Member
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1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6807
Rodney, if you were going to do a 355, I'd say check your old block if that's the way you're wanting to to go. Unless you're really planning to knock the &%@# out of what you end up with, you really can build a respectable 2 bolt main small block.

If a stroker is what your after, you can spend a small fortune getting your block ready and may want to consider a crate motor option. Don't know enough about your existing heads, manifold, etc, but you will most likely not be able to use your existing crank, rods and pistons as those are the main parts that get changed out to increase cubic inches by altering the stroke of the motor.

Happy to chat with you off line on this as I lived through the build up of my 406 which included a lot of machine work to prep and wasn't cheap...


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1/1/11 1:51pm - Reply: 'Help with motor choices'
Per4mance Lifetime Member
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Morganville, NJ - USA

1971 350 270 hp roadster millivanilli red, black interior, white rag top, white hard top, I've had it 18 years and intend on giving it to my son for his 25th birthday(another 18 years from now)

Joined: 1/25/2009
Posts: 92
rod, I agree with Paul,there are a ton of motors out there for sale if you are going to stroke it Michigan motors is a great place to start. I've used 2 in marine applications and had NO issues Quality product and great warrentee just my .02  

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1/2/11 4:47pm - Reply: 'Help with motor choices'
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Lino Lakes, MN - USA

71 Coupe LS5 454 Auto

Joined: 1/8/2009
Posts: 138

4 bolt main blocks are overrated. Yes, they'll be stronger, but a 2 bolt will handle a ton of power.

I built a 383 stroker out of my 75 350 2 bolt block, made 445 hp and 515 torque no problem. Unless you're going over 550hp or racing at the track (lots of high RPMs), don't worry about it.
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1/2/11 7:24pm - Reply: 'Help with motor choices'
ranger3 Lifetime Member
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North Charleston, SC - USA

1975 L48 AT AC T-top

Joined: 3/20/2004
Posts: 4176
Good information, thanks. I suspect that mine is a 2 bolt main and have been wondering about what I would do when my engine needs to be freshened up. These comments help.



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1/3/11 6:54pm - Reply: 'Help with motor choices'
dwright Gold Member
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Victor, NY - USA

2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe

Joined: 7/12/2004
Posts: 6768
If you are going to do most of the work yourself, go with the '74. It's the one that makes the most sense.


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