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#346507 - Sat Dec 08 2007 10:49 PM Chevy Intake Manifold Casting Number Look Up?
Rusty Bucket Offline
Apprentice
Registered: Tue Oct 02 2007 12:00 PM
Posts: 38
Loc: Berkeley, California
My 1959 Apache has a rebuilt 283 (casting # 3737739 mfg. between 1958-1964)with a Iskenderian 3/4 racing cam and a quadrajet carb instead of the origninal Rochester 4G. Also added on four-pipe exhaust headers and dual exhaust. Anyway, the intake manifold has a casting number of 8876864 w/ "GM1" below it. Where can I look up the info on this intake manifold? Couldn't find anything in archives or the Jim Carter Chevy on-line parts book.

Also, if you know, would it be OK to replace the four-pipe exhaust headers and leave everything else as is? Doesn't seem like the volume of exhaust output would be much different, but what do I know?

Thanks.
_________________________
Gregg
1959 Chevy Apache 3100
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#346525 - Sat Dec 08 2007 11:44 PM Re: Chevy Intake Manifold Casting Number Look Up? [Re: Rusty Bucket]
red58 Offline
Boltergeist
Registered: Sun Feb 03 2002 12:00 PM
Posts: 16116
Loc: north of the 49th
my book shows 3737739 as 58-61, truck or car, and that's the most desireable block - may be original to the truck, if your vin starts with a V

the intake casting numbers don't mean a lot - same number may have been machined differently for different applications - should have a date code on it tho' that'll maybe tell if it's original to the engine, "letter[month]/2numbers[day]/one number[year]" ... might have to guess if 5 or 6 is 50s, 60s, 70s

yes, you can return to the original style ramshorn exhaust manifolds, they breathe pretty well - could also do a crossover to get back to single exhaust, tho' you'd have to have that custom made prolly, doubt the original Y pipe could be found

Bill
_________________________
"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot
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#346647 - Sun Dec 09 2007 11:41 AM Re: Chevy Intake Manifold Casting Number Look Up? [Re: red58]
rfs56trk Offline
Shop Shark
Registered: Sat Apr 16 2005 12:00 PM
Posts: 1466
Loc: Seal Beach, CA
Gregg,
If it has a Q-jet and manifold it has to be 66 up. Also a 58 V-8 light duty truck did not come with a 4 jet or any other 4 bl carb. A 4 bl was offered in a car but trucks had a 2 bl.
As Bill said check the date code, that should narrow it down, also the Q-jet will have a number which will identify the year and application.
Fred
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#346861 - Sun Dec 09 2007 10:01 PM Re: Chevy Intake Manifold Casting Number Look Up? [Re: rfs56trk]
Rusty Bucket Offline
Apprentice
Registered: Tue Oct 02 2007 12:00 PM
Posts: 38
Loc: Berkeley, California
OK, thanks, guys. I'm going to go to the rams horn exhaust manifolds for sure, if for no other reason than that the current four-pipe header is tight up against the steering gear box; can't even adjust the gear box, and all that heat can't be good for it,either. I'll check the intake manifold for a date, but I know it's not original because, as Fred pointed out, the Q-jets are 66 and up. I rebuilt the Q-jet, and the number look up showed it to be a '73. Hmmm, I'd like to ditch the dual exhaust, but if the Y pipe for the cross-over can't be found may just leave it as is. Sounds good, anyway, with that racing cam.
You guys are a wealth of info. Mucas Grasias.
_________________________
Gregg
1959 Chevy Apache 3100
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#347047 - Mon Dec 10 2007 12:14 PM Re: Chevy Intake Manifold Casting Number Look Up? [Re: Rusty Bucket]
rfs56trk Offline
Shop Shark
Registered: Sat Apr 16 2005 12:00 PM
Posts: 1466
Loc: Seal Beach, CA
They had the problems worked out on Q-jets by 73. Should be a good one. The application is likely to be for a 350 engine.
Fred
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