so, from what i've researched, I have a 69 350 short block with 1973 cylinder heads and a 1974 two barrel intake(495104).
I have a Frankenstien engine :shock:
I have a Frankenstien engine :shock:
68 Pontiac 350 for the Safari
- Thread starter crazy'boutOlds
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Well, I had to remove the exhaust manifolds to take out the bad freeze plugs. They each had four holes. The cylinder heads have six! The spot on the manifolds were the 5th and 6 hole should be are not there :? My vacation ends today, so I won't be able to keep researching like I have been. O well, I guess I'll just keep chugging along, with all you guys helping of course. 🙂
I don't know what your carb plans are, but I have an older Edelbrock P4B, squarebore intake if you're interested. It has some helicoil repairs but it's been thrermally cleaned and looks great. One of the linkage bracket bosses has a helicoil and a JB Weld repair. I make it sound worse than it is, but I'd use it without worry and I'm a picky b*st*rd. My plan was to powdercoat it but I never got around to it.
It's no use to me and I'd let it go for $20 + shipping.
It's no use to me and I'd let it go for $20 + shipping.
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I'm going to pick up a 301 tomorrow for the engine perches , carb and a/c brackets. The fellow also has a 400 intake I might get. I'll let you know either way. Thanks.
In '71 and '72 for some unknown reason the factory left the 2 end bolts off the exhaust manifolds/ heads. Perhaps they saved $.07 per motor? 
The ends of the manifolds were beveled slightly to make a good seal even with the missing bolts. Those 4C heads are decent and have low compression and were either for the 350 or 400 depending on the suffix located on a flat spot on the side of the head. Perhaps someone swapped the exhaust manifolds to fit a certain chassis, as they differed slightly from the "A-G" and "F-B-X" models. Frankenstein or not, I have done the same thing to fit a mutt motor to a car. Also I think 301 AC stuff won't fit right.
The following are 73-74 heads
(cc's are factory reported, may actually be different)
4X-1H uses 4.881/4.870" tall valves
4X-1H are 455 head with 114cc, 2.11/1.66" valves and pressed studs.
4X-3H are 400 4bbl head with manual transmission, 98cc, 2.11/1.66" valves and screw-in studs.
4X-4H are 400 2bbl head, 1.96/1.66" valves and pressed studs.
4X-7H are 400 4bbl with auto trans, 98cc, 2.11/1.66" and screw-in studs.
46 are 350 2bbl/4bbl heads with about 86cc, 1.96/1.66" valves and pressed studs.
4C-5 are 350 with AIR, 1.96/1.66" 86cc, pressed stud.
4C-9 are 400 with AIR, 1.96/1.66", 98 cc, pressed stud. *All heads cast around April, 1973 received threaded studs. So, take the head above and if they were cast after or about April 73, the "pressed" applications will be "screw-in".
The ends of the manifolds were beveled slightly to make a good seal even with the missing bolts. Those 4C heads are decent and have low compression and were either for the 350 or 400 depending on the suffix located on a flat spot on the side of the head. Perhaps someone swapped the exhaust manifolds to fit a certain chassis, as they differed slightly from the "A-G" and "F-B-X" models. Frankenstein or not, I have done the same thing to fit a mutt motor to a car. Also I think 301 AC stuff won't fit right.
The following are 73-74 heads
(cc's are factory reported, may actually be different)
4X-1H uses 4.881/4.870" tall valves
4X-1H are 455 head with 114cc, 2.11/1.66" valves and pressed studs.
4X-3H are 400 4bbl head with manual transmission, 98cc, 2.11/1.66" valves and screw-in studs.
4X-4H are 400 2bbl head, 1.96/1.66" valves and pressed studs.
4X-7H are 400 4bbl with auto trans, 98cc, 2.11/1.66" and screw-in studs.
46 are 350 2bbl/4bbl heads with about 86cc, 1.96/1.66" valves and pressed studs.
4C-5 are 350 with AIR, 1.96/1.66" 86cc, pressed stud.
4C-9 are 400 with AIR, 1.96/1.66", 98 cc, pressed stud. *All heads cast around April, 1973 received threaded studs. So, take the head above and if they were cast after or about April 73, the "pressed" applications will be "screw-in".
Just a quick addition, from my info, YE for 69 codes as 350ci, 2bbl, 265hp.crazy'boutOlds said:
Deanlemans81
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