The Forward Look Network | ||
| ||
301 vs 318 Jump to page : 1 Now viewing page 1 [50 messages per page] | View previous thread :: View next thread |
Forward Look Technical Discussions -> General Technical Discussion and Troubleshooting | Message format |
johnfin |
| ||
Veteran Posts: 100 | Do the 301 valve covers only have 2 bolts to hold them on vs. the 3 on the 318? | ||
CaprockClassics |
| ||
Elite Veteran Posts: 618 Location: Lubbock, TX | They are the same valve cover, if we are referring to the A Series Polyhead 318 used up till 1966. LA-318 is a totally different engine. ~Peter | ||
Rodger |
| ||
Expert Posts: 1506 Location: Colo Spgs | Hola John The first series of the A-277 to A-318 ( 1956 to 1966 ) Engines have a Three Hole Valve Tappet Cover. After a while it was realized that Two Holes would hold the Valve Tappet Cover to the heads and the 3 hole design --- went away. The bolts used are: 5/16 x 18 x 2 . They all use a little Flat Washer - with a Rubber Seal. ----------- The "newer cover's" have The Wiring Loom Spot Welded vs being bolted. ---------------- Every set of heads still have The Thread Bolt Holes. Rodger & Gabby Colo spgs | ||
kenbiello |
| ||
Veteran Posts: 121 | Attached pic is a 1955 Chrysler Windsor 301. Three (3) fasteners per valve cover (1955-301-poly.JPG) Attachments ---------------- 1955-301-poly.JPG (114KB - 180 downloads) | ||
Rodger |
| ||
Expert Posts: 1506 Location: Colo Spgs | Hola Ooopp's --- Even tho I read 301 --- my mind clicked on The Plymouth "Poly". Thank You for not raising a fuss of what I did. Rodger & Gabby COS | ||
Mopar1 |
| ||
Expert Posts: 3027 Location: N.W. Fla. | One needs to be specific when mentioning a 301, but it would seem natural when comparing one to a 318 to assume it's the Plym poly. | ||
johnfin |
| ||
Veteran Posts: 100 | one on bottom is a 318 poly, 2 bolt on top is off a documented 1957 american made 301 poly. No provisions for 3rd hole in cast head. (IMG_20170209_132149621_HDR_01.JPG) Attachments ---------------- IMG_20170209_132149621_HDR_01.JPG (125KB - 178 downloads) | ||
Powerflite |
| ||
Expert 5K+ Posts: 9604 Location: So. Cal | I think you have it backwards. The 3 hole is the earlier style. My original '56 Plymouth 277 has 3 bolts, and it was produced only 1/2 year before the 301. (DSC02504_small.JPG) Attachments ---------------- DSC02504_small.JPG (105KB - 191 downloads) | ||
johnfin |
| ||
Veteran Posts: 100 | I that 3 bolt i showed you is a 1962 318 poly. 318 came after 301 right. The 2 bolt is an original 57 301. I think what we are seeing is different factories using up parts. | ||
1961plymouthfury |
| ||
Expert Posts: 2631 Location: Minor Hill, TN | My '57 savoy had a 301 and I still miss her I would of owner her for 32 years this past April 30 th. | ||
56D500boy |
| ||
Expert 5K+ Posts: 9855 Location: Lower Mainland BC | Off-topic but sort of related: When did the valve cover ventilation begin? Seems like 1956 would be too soon. Is this a later retrofit? | ||
Powerflite |
| ||
Expert 5K+ Posts: 9604 Location: So. Cal | That's a California pollution control requirement that was installed on it. | ||
56D500boy |
| ||
Expert 5K+ Posts: 9855 Location: Lower Mainland BC | Powerflite - 2017-05-07 1:39 PM That's a California pollution control requirement that was installed on it. Okay. A "C.A.R.B." requirement. Do you know whether that was done at the factory or after the factory? Regardless, I guess only for California-destined cars. Edited by 56D500boy 2017-05-07 1:57 PM | ||
Powerflite |
| ||
Expert 5K+ Posts: 9604 Location: So. Cal | The PCV system requirement was put into effect in 1963 in California, and the older vehicles were retrofitted with it. PCV systems were required on new cars in the rest of the United States in 1968. | ||
Greg P. |
| ||
Elite Veteran Posts: 769 Location: Oley, PA | 56D500boy - 2017-05-07 1:10 PM Off-topic but sort of related: When did the valve cover ventilation begin? Seems like 1956 would be too soon. Is this a later retrofit? PCV valve was first offered by Chrysler for the 1961 model year. It was standard equipment on all new 1961 model cars sold in California and offered as an option in other states. By 1964 it was standard equipment in all 50 states. | ||
Jump to page : 1 Now viewing page 1 [50 messages per page] |
Search this forum Printer friendly version E-mail a link to this thread |
(Delete all cookies set by this site) | |