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Street 451 overkill????

Posted By: farmboy

Street 451 overkill???? - 12/28/11 12:45 AM

I was planning on building a pretty mild 451 for street use only. I have access to some 400 heavy main blocks. Any reason not to use one of these blocks? Do they sell for much more than a standard 400 block? I hate to use one, if they are in demand for race engines. Give me your opinion. TIA
Posted By: 1967dartgt

Re: Street 451 overkill???? - 12/28/11 12:48 AM

Use it I don't see them bring much more then a 400.
Posted By: ChrisJohnston669

Re: Street 451 overkill???? - 12/28/11 12:51 AM

451's are nasty. My dad built one for a guy that drives it on the street and races it. He drives it to the track and runs 10.70s.
Posted By: MR_P_BODY

Re: Street 451 overkill???? - 12/28/11 12:57 AM

Quote:

I was planning on building a pretty mild 451 for street use only. I have access to some 400 heavy main blocks. Any reason not to use one of these blocks? Do they sell for much more than a standard 400 block? I hate to use one, if they are in demand for race engines. Give me your opinion. TIA



If they are the 230(I believe thats the number) blocks
some guys will pay a good price for them... for a
mild street engine, use any good 400 block
Posted By: farmboy

Re: Street 451 overkill???? - 12/28/11 12:59 AM

Yes, they are 230 blocks.
Posted By: Cab_Burge

Re: Street 451 overkill???? - 12/28/11 02:26 AM

Quote:

Yes, they are 230 blocks.

The "230" blocks came both ways, thick and standard mains.I have one of the thick ones and two that are not Only some of the first castings made bewteen 07-71 and 10-71, I think, where the cold weather thick main web blocks In other words not all the early "230" castings where the better thick main web ones
Posted By: MR_P_BODY

Re: Street 451 overkill???? - 12/28/11 02:35 AM

Quote:

Quote:

Yes, they are 230 blocks.

The "230" blocks came both ways, thick and standard mains.I have one of the thick ones and two that are not Only some of the first castings made bewteen 07-71 and 10-71, I think, where the cold weather thick main web blocks In other words not all the early "230" castings where the better thick main web ones




He did say thick web Blocks
Posted By: farmboy

Re: Street 451 overkill???? - 12/28/11 04:14 AM

Quote:

Quote:

Yes, they are 230 blocks.

The "230" blocks came both ways, thick and standard mains.I have one of the thick ones and two that are not Only some of the first castings made bewteen 07-71 and 10-71, I think, where the cold weather thick main web blocks In other words not all the early "230" castings where the better thick main web ones



I will check them tommorrow, I know a couple of them had the heavy main web.
Posted By: CH3NO2

Re: Street 451 overkill???? - 12/28/11 06:08 AM

Those 4 blocks that were sold were the good ones, thats why I had saved them. One of them that was sand blased did not have the original caps, but I don't know what Brad told you. I'de do the 470 with some real aftermarket heads that flow in the 350cfm range. Steve
Posted By: farmboy

Re: Street 451 overkill???? - 12/28/11 11:04 AM

Thanks Steve, I thought they were the good ones.
Posted By: quickd100

Re: Street 451 overkill???? - 12/28/11 11:59 AM

Before sinking ANY money in the machining have cylinder bores sonic checked. I've got a standard bore 230 block 7-31-71 casting date. One cylinder is only .080 thick. 4 cylinders are real thin. Dave
Posted By: Cab_Burge

Re: Street 451 overkill???? - 12/28/11 08:25 PM

Quote:

Before sinking ANY money in the machining have cylinder bores sonic checked. I've got a standard bore 230 block 7-31-71 casting date. One cylinder is only .080 thick. 4 cylinders are real thin. Dave

Been there done that, put money into a 400 block that was thin, didn't have it sonic tested first It split a cylinder wall on the dyno
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