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69L78
 Post subject: sbc stock replacement heads and blocks
PostPosted: Thu Nov 21, 2013 6:26 pm 
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Joined: Mon Jul 27, 2009 9:06 am
Posts: 230
Are stock over-the-counter replacement heads allowed? Asking if the replacement 370 heads can be used in place of the 186 heads on a small block chevy. Thanks, John
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RalphsRapidTransit
 Post subject: Re: sbc stock replacement heads
PostPosted: Fri Nov 22, 2013 10:00 am 
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Joined: Fri Jul 25, 2008 12:26 am
Posts: 7475
Location: Bristol CT
We are looking into this for you. We will get you an answer shortly

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66 Belvedere I HP2 Hemi Auto 11.13 @ 124MPH 1.68 60' S/A

70 RoadRunner 440+6 Auto 11.05 @ 125MPH 1.67 60' S/A

70 AAR Cuda 340+6BBL 4 Spd. 11.58 @ 121MPH 1.76 60' S/A

72 Demon GSS 340 S/A 11.76 @ 118MPH 1.89 60' S/A

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RalphsRapidTransit
 Post subject: Re: sbc stock replacement heads
PostPosted: Mon Nov 25, 2013 1:59 pm 
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Joined: Fri Jul 25, 2008 12:26 am
Posts: 7475
Location: Bristol CT
The 370 heads are allowed and a legal replacemnet for the 186 in SuperCars

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SUPERCAR LEGAL

66 Belvedere I HP2 Hemi Auto 11.13 @ 124MPH 1.68 60' S/A

70 RoadRunner 440+6 Auto 11.05 @ 125MPH 1.67 60' S/A

70 AAR Cuda 340+6BBL 4 Spd. 11.58 @ 121MPH 1.76 60' S/A

72 Demon GSS 340 S/A 11.76 @ 118MPH 1.89 60' S/A

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69L78
 Post subject: Re: sbc stock replacement heads
PostPosted: Mon Nov 25, 2013 4:11 pm 
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Joined: Mon Jul 27, 2009 9:06 am
Posts: 230
Great news, thanks. :beer
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1972LS5Chevelle
 Post subject: Re: sbc stock replacement heads
PostPosted: Mon Nov 25, 2013 5:15 pm 
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Joined: Sun Dec 26, 2010 11:42 am
Posts: 564
Location: Florida
:pop Whatcha building? :stir

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1972 Chevelle SS 454 4 speed
1969 Malibu 2dr hardtop L48/4 speed -> 427 L72
1968 Malibu 2dr hardtop restomod
1972 Monte Carlo

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69L78
 Post subject: Re: sbc stock replacement heads
PostPosted: Mon Nov 25, 2013 8:03 pm 
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Joined: Mon Jul 27, 2009 9:06 am
Posts: 230
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1972LS5Chevelle
 Post subject: Re: sbc stock replacement heads
PostPosted: Mon Nov 25, 2013 9:09 pm 
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Joined: Sun Dec 26, 2010 11:42 am
Posts: 564
Location: Florida
COOL! :aok I was thinking that's what it was, or possibly a 70.5

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1972 Chevelle SS 454 4 speed
1969 Malibu 2dr hardtop L48/4 speed -> 427 L72
1968 Malibu 2dr hardtop restomod
1972 Monte Carlo

Yes, I have an addiction.

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gnmas
 Post subject: Re: sbc stock replacement heads
PostPosted: Mon Nov 25, 2013 10:48 pm 
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Joined: Tue Jul 12, 2011 11:48 pm
Posts: 81
how about an aftermarket block? i'm considering buying a car to build for my son. is there a Dart or World block that could be Legalized? Trying to build a chevy small block over 400 inches reguires using a 40 yr old 400 block
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Ted Daros
 Post subject: Re: sbc stock replacement heads
PostPosted: Mon Nov 25, 2013 11:20 pm 
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Joined: Fri Jul 25, 2008 6:12 pm
Posts: 2617
Location: North Salem NY
You have to find a peice that fits your build and the criteria outlined in the rules and bring it up for approval! If it looks stock or you have a good case we will review it! This goes for all marques!

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1972LS5Chevelle
 Post subject: Re: sbc stock replacement heads
PostPosted: Mon Nov 25, 2013 11:31 pm 
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Joined: Sun Dec 26, 2010 11:42 am
Posts: 564
Location: Florida
Maybe a bowtie block?

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1972 Chevelle SS 454 4 speed
1969 Malibu 2dr hardtop L48/4 speed -> 427 L72
1968 Malibu 2dr hardtop restomod
1972 Monte Carlo

Yes, I have an addiction.

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69L78
 Post subject: Re: sbc stock replacement heads
PostPosted: Tue Nov 26, 2013 1:50 am 
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Joined: Mon Jul 27, 2009 9:06 am
Posts: 230
World block 84030 is a 400 sbc and is NHRA approved as a replacement.
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1972LS5Chevelle
 Post subject: Re: sbc stock replacement heads
PostPosted: Tue Nov 26, 2013 3:15 pm 
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Joined: Sun Dec 26, 2010 11:42 am
Posts: 564
Location: Florida
:aok "Max bore 4.2" :rock

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1972 Chevelle SS 454 4 speed
1969 Malibu 2dr hardtop L48/4 speed -> 427 L72
1968 Malibu 2dr hardtop restomod
1972 Monte Carlo

Yes, I have an addiction.

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SuperCar Races
 Post subject: Re: sbc stock replacement heads
PostPosted: Thu May 20, 2021 7:43 am 
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Site Admin

Joined: Thu Jul 24, 2003 5:53 pm
Posts: 1993
Location: Bristol CT
Questions have been asked regarding small block heads and blocks. This should give some guidance. Please post your questions in this tread regarding Small Block Heads and Blocks.

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