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 Post subject: BBC L89 heads
PostPosted: Fri Nov 16, 2018 8:30 pm 
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Joined: Mon Jul 27, 2009 9:06 am
Posts: 230
The GM Performance 12363408/401 aluminum heads that were approved in 2013 are no longer available. The substitute heads are now 19331427.

https://www.summitracing.com/parts/nal-19331427

Have these newer heads been approved? Also, since they are modern replacements, do they have to be made to look like the vintage 842 heads?

GM Performance heads have the Chevy Bowtie and not the snowflake. Thanks.


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 Post subject: Re: BBC L89 heads
PostPosted: Sat Nov 17, 2018 8:25 pm 
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Joined: Fri Jul 25, 2008 12:26 am
Posts: 7469
Location: Bristol CT
I'll look into them.

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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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 Post subject: Re: BBC L89 heads
PostPosted: Tue Nov 20, 2018 9:04 am 
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Joined: Tue Oct 19, 2010 5:29 pm
Posts: 133
Location: CT
Might be time to build a 1971 LS6 Corvette "tribute" using these heads if they are Supercar legal ;)

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11.90 @ 112 MPH,1.69 60 ft. (on M/T ET Street bias tires)
12.15 @ 111.8 MPH,1.85 60 ft. (Certified 100% S/A on Goodyear Polyglas G70-14)


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 Post subject: Re: BBC L89 heads
PostPosted: Thu Jan 02, 2020 5:15 pm 
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Joined: Sun Dec 26, 2010 11:42 am
Posts: 564
Location: Florida
I recently found a pair of the 401 casting heads, IIRC asking price is $2k - bare.

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

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 Post subject: Re: BBC L89 heads
PostPosted: Thu Jan 02, 2020 7:25 pm 
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Joined: Fri Jul 25, 2008 12:26 am
Posts: 7469
Location: Bristol CT
Make sure to ask the Chevy boys for tricks and secrets they may have.

_________________
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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