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351c 2 bolt main to 4 bolt? 

 

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 Post subject: 351c 2 bolt main to 4 bolt?
Posted: Thu Sep 01, 2011 4:15 pm 
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Hey,

I've been looking for a 4 bolt main 351c block now and they seem to be hard to get your hands one, Now I have had an offer of a good 2 bolt block and the seller has said you can change them into a 4 bolt block?
He said that the only difference is a higher nickel and slightly thicker walls.
Is this all true? How hard is this to get done?
The engine I'm going to build, I will be hoping for 500-600hp, Will a block like this take this?
Also will it last?

Thanks in advance.

 

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 Post subject: Re: 351c 2 bolt main to 4 bolt?
Posted: Thu Sep 01, 2011 4:31 pm 
Getting Side Ways
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4 bolt conversion is common, all cleveland blocks were cast with the outboard bolt bosses and were identical in casting except for the special nascar and pillow blocks. The 4 bolt caps are skimmed then the main tunnel is line bored to size. The end result is truer than a used block. 600HP is well within a cleveland blocks capability, so long as the assembly and tune is good

 

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 Post subject: Re: 351c 2 bolt main to 4 bolt?
Posted: Thu Sep 01, 2011 5:47 pm 
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xafalcon wrote:
600HP is well within a cleveland blocks capability, so long as the assembly and tune is good


Well within a 2 bolt blocks capability or just a 4 bolt block?

 

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 Post subject: Re: 351c 2 bolt main to 4 bolt?
Posted: Thu Sep 01, 2011 7:11 pm 
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Higher nickel and thicker walls is not true of 4 bolt blocks and you'll see that all blocks have the bosses there for the outer set of bolts.
A mate of mine is running 575hp out of his 2 bolt cleveland with a girdle and no problems. It's the cylinder walls that are the main problem with clevelands, so you could do a partial grout fill as my mate has done with his. He canes the f**k out of it regularly and it doesn't get hot or play up at all.
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 Post subject: Re: 351c 2 bolt main to 4 bolt?
Posted: Thu Sep 01, 2011 8:26 pm 
Getting Side Ways
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we have a 393 clevo that does just over 600hp, it was 2 bolt un grouted block and after approx 30 passes and around 1500 street kms we tore it down to prep it a bit better (we never anticipated it would make that much hp initially so didnt bother grout filling it etc ) and all was spot on except for a couple of main caps that were walking.
Ideally 4-bolt mains or dowell the 2 bolt mains, a girdle would help slightly but the caps can still walk under the girdle.
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 Post subject: Re: 351c 2 bolt main to 4 bolt?
Posted: Sat Sep 03, 2011 6:21 am 
Getting Side Ways
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66 coupe wrote:
we have a 393 clevo that does just over 600hp, it was 2 bolt un grouted block and after approx 30 passes and around 1500 street kms we tore it down to prep it a bit better (we never anticipated it would make that much hp initially so didnt bother grout filling it etc ) and all was spot on except for a couple of main caps that were walking.
Ideally 4-bolt mains or dowell the 2 bolt mains, a girdle would help slightly but the caps can still walk under the girdle.


Interesting that you still had main cap movement with a girdle. In my experience I have always found them superior to 4 bolt caps since they tie all 10 main studs together. What brand of girdle did you use? I have always used DSS racing girdles & windage trays. I'll keep an eye out for main cap movement when I pull my supercharged 5.0 apart later in the year.

 

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 Post subject: Re: 351c 2 bolt main to 4 bolt?
Posted: Sat Sep 03, 2011 9:13 am 
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there wasnt a girdle
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