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#1 |
Registered User
Join Date: Nov 2003
Location: Wisconsin
Posts: 281
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Does anyone know off hand if these are the peanut port heads or the large oval port heads?
The casting number is 473328, which according to Mortec is a 68-69, "oval", Open, from a 366 tall deck. Here's all the info on the passenger side head starting from the rear. B1-78 GM1T TRUCK 473328 Oh yeah, is there any difference between heads from a tall deck block compared to heads from a regular deck block? My block looks to be a 402 regualar deck. Thanks ![]()
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Tom 1968 C10 LWB. 402 BB, Holley MPI, 700R4. 4wheel Hydroboost Disk Brakes. |
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#2 |
Account Suspended
Join Date: Dec 2003
Location: Texas
Posts: 2,686
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I was lead to belive they didnt have the peanut port untill mid 80s
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#3 |
F.A.S.T. president
![]() Join Date: Sep 2003
Location: Florida
Posts: 1,883
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The only peanut ports I have ever seen are actually round in shape not oval. None of the diffrent casting # research pages I have looked at distinguish the diffrence. They all say oval but I have seen the small round ports that I consider to be the peanut port.
Last edited by jamis; 01-25-2004 at 09:14 PM. |
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#4 |
Registered User
Join Date: May 2001
Location: Bethlehem, GA, USA
Posts: 389
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peanuts
I agree, I thought the peanut ports came along in the 80's
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#5 |
Chevy Freak
Join Date: Sep 2002
Location: Meadville, Pa.
Posts: 2,804
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366 heads
I have had a few of these 366's. The heads were usually large oval with huge combustion chambers (somewhere around 120cc).
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69 GMC SWB, 350 70 Chevy LWB, 350 55 chevy gasser, 461 73 Camaro, 496 67 RS Camaro, 406 64 Chevelle, 588 71 Nova, 565 67 Camaro, 461 |
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#6 |
Registered User
Join Date: Nov 2003
Location: Wisconsin
Posts: 281
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Cool, thanks for all the replies. From what everyone's said, it sounds like my new setup should bolt right on. I guess I'll know for sure when I get around to taking the old manifold off.
![]() Thanks again.
__________________
Tom 1968 C10 LWB. 402 BB, Holley MPI, 700R4. 4wheel Hydroboost Disk Brakes. |
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#7 |
Registered User
Join Date: Nov 2003
Location: st. louis area
Posts: 1,551
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I think peanut ports started in 76
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75 GMC C-15 short/step factory 454, lowered |
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#8 |
Registered User
![]() Join Date: Sep 2003
Location: Arizona
Posts: 305
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Mark IV, Gen V, Gen VI small oval dimensions
are 1.45 x 1.60 and were made from 1976 on. Large oval dimensions are 1.82 x 1.60. |
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