Cam Shaft 1974 455

You are also positive the lifters are 5232265?
You are using the original pushrods?
 
Yes new lifters are 5232265. Yes they are the push rods that were in engine that had the bad comp cam that I replaced with the melling spc-7 cam. I assume they are original in that engine.
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Are the pushrods 9.130" long?
 
I believe I measured that at 9.130" when I was looking into replacing them. I cleaned them up and measured them and looked them over for straightness and wear and they all looked good so I didn't replace them.
 
Any chance you know your oil pressure?
Do you know if the heads have been milled?
 
No but when I ran my drill to the oil pump it was 60 lbs. I do not know if the heads were milled.
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Trying to figure what is going on that the engine ran with loosened valves.
 
We were guessing when we saw blowback out of the throttle body that meant maybe a valve wasn't closing at proper time. Since you can't adjust rocker arms we figured loosening stud nut might help get whichever valves aren't closing to close. It seemed to help.
 
Did you do anything to the valve springs?
 
No we did not touch the valve springs.
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Since I am putting on the comp cams roller tipped rockers and prw polylocks do you know if the standard gm valve covers will need to be raised due to the polylocks?
 
Larryd said:
Since I am putting on the comp cams roller tipped rockers and prw polylocks do you know if the standard gm valve covers will need to be raised due to the polylocks?
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Not sure, they may have thicker valve cover gaskets for minor height increase.
 
Ok I will know when I receive and assemble .Thank You
 
What is the proper initial timing for my 455@12 degrees or? And what would be best advance at 2500-3000. I put a holley sniper on it and it seems to be real dogged down under load. Like going up a small hill I have to really hold back on acceleration to keep moving. Holley thinks I have a timing or vacume advance problem. I currently have it set at 12 degrees initial timing and it registers 34 degrees at 2500-3000. It starts and idles just fine. Cannot do a fast full throttle with no load it will flutter and die.
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Also what is the proper plug and proper gap and proper reach on sparkplugs?
 
Larryd said:
What is the proper initial timing for my 455@12 degrees or? And what would be best advance at 2500-3000. I put a holley sniper on it and it seems to be real dogged down under load. Like going up a small hill I have to really hold back on acceleration to keep moving. Holley thinks I have a timing or vacume advance problem. I currently have it set at 12 degrees initial timing and it registers 34 degrees at 2500-3000. It starts and idles just fine. Cannot do a fast full throttle with no load it will flutter and die.
Click to expand...
12 degrees initial is good and 36 at 2800 to 3000 is what you want. What does the system do to compensate for the normal vacuum advance that adds another 10 degrees under part throttle driving?
 
Larryd said:
Also what is the proper plug and proper gap and proper reach on sparkplugs?
Click to expand...
Unless you have raised compression or changed cylinder heads the plug is the stock 74 455 plug. If you have any kind of high energy ignition coil gap is .045.
 
The sniper only controls fuel. No timing control on this 455. Well I am using the HEI distributer. So my plugs are set at 045. It appears engine timing is correct but something isn't right. I am currently looking at the new spark plugs I had put in to see their color.
 
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