Help Please 351W question
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Laughing Gas
Joined: Jan 2008
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From: Alabama
Help Please 351W question
Hello. New to the forum. I have come to a point in my rebuild that I am stuck and need your expert advice. Over the years I have done several engine rebuilds but have always went stock on everything. This is my once in a life time rebuild of an old truck and I went to the darkside. I have a 53 F100 that has a 351 windsor motor. The motor was completely worn out. I had a local shop to vat and bore the block. Then I replaced everything. It now has a comp cam with a .500 lift and duration @ .050 Intake and exhaust .224. Lobe lift is .313. Lobe seperation is 110.0. The heads are stock cast heads that had flat tappet rockers. I replaced the valves with stainless valves and .550 springs. Now for my question, I am stuck as to what type rockers to use. I looked at the Summit web site and there are so many types of rockers I'm not sure what is best to use. I see alot of 7/16 and 3/8 stud mounts. The stock rockers were held in place with a 5/16 bolt. Anyone out there that has experience with this and can point me in the right direction? It would be greatly appreciated. Lakota
Posting Guru
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The bigger the bolt the better with the rockers, but you have to have your heads machined to use them. You can buy a set of pedestal mount roller rockers that will bolt right on. Look for pedestal mount. If you have pedestal mount rockers, you probably also have 8.182 pushrods, be sure, because the earlier , more common ones are 8.152 , and usually what are offered in the high performance lines. I'm sure you meant .513 lift, BTW. Welcome to the site.
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Laughing Gas
Joined: Jan 2008
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From: Alabama
Thanks Doug and Baddad, That is the info I was looking for. I checked my old pushrods with a height gage and they are 8.180 to 8.189 in length. This is just a mild cam. I have a small machine shop so it would be nothing to drill and tap the heads for a 7/16 or 3/8 stud. Would this be better than the original 5/16? BTW, These are 1974 heads and the motor has hydrualic lifters. I'm not doing anything radicle to this motor just going to be a weekend driver. Again thanks for all the help.
Postmaster
Joined: Jun 2005
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get some replacement roller rockers, 1.6 pedestal mount... that would be the cheapest and easiest way to go... then you could reuse the pushrods.
otherwise you will need to machine the stud bosses down flat, drill and tap the bosses buy guideplates, hardened pushrods, studs and rockers.
otherwise you will need to machine the stud bosses down flat, drill and tap the bosses buy guideplates, hardened pushrods, studs and rockers.
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Have you thought about opening up the exhaust side of those heads a little? Maybe you might be the guy I need to talk to about cutting in some 1.60 exhaust seats and opening up the intakes for 1.94 intake valves on a set of stock heads. Are you equipped for that?
Hotshot
Joined: May 2003
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From: south louisiana
Originally Posted by Lakotas53
Thanks Doug and Baddad, That is the info I was looking for. I checked my old pushrods with a height gage and they are 8.180 to 8.189 in length. This is just a mild cam. I have a small machine shop so it would be nothing to drill and tap the heads for a 7/16 or 3/8 stud. Would this be better than the original 5/16? BTW, These are 1974 heads and the motor has hydrualic lifters. I'm not doing anything radicle to this motor just going to be a weekend driver. Again thanks for all the help.
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Posting Guru
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Baddad, read his original post, "the stock rockers were held in place with 5/16" bolts..." and he has 8.182 pushrods. I think he's mistaken on the year, probably '84's.
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Hotshot
Joined: May 2003
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From: south louisiana
Originally Posted by doug1222556
Baddad, read his original post, "the stock rockers were held in place with 5/16" bolts..."
Hotshot
Joined: May 2003
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From: south louisiana
69-77 351W's had rail rockers and used longer pushrods. I looked up two sets for the 69-78 Windsors and they're listed at 8.15" . 8.18 is so close, it doesn't matter, that would be a .030 loger rod, if both measurements were the same (Guage length and overall length are two different dimensions)
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Laughing Gas
Joined: Jan 2008
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From: Alabama
Hey guys, just got back into town and saw all these replys. I said they were 74 heads but I was going by the date code on the block. Never occured to me that the PO could have put different year heads on this motor. He told me it came straight out of a 80's model van. He also told me it was running good when he pulled it. Take a look at the pics in my gallery. It was worn out! They have a boss or raised area that is drilled and tapped 5/16 thread. No studs. Do the heads have a date code same as the block has?
Doug, I have never tried anything like that but I do have a vertical and horz. mill. If it needs to be ground I doubt I could do that. All I have is a 6X12 surface grinder at the house. My old job had all the vertical and cylindrical grinders and would let me use them any time but now I work for a foreign auto manuf. and they do not believe in government jobs at all.
Doug, I have never tried anything like that but I do have a vertical and horz. mill. If it needs to be ground I doubt I could do that. All I have is a 6X12 surface grinder at the house. My old job had all the vertical and cylindrical grinders and would let me use them any time but now I work for a foreign auto manuf. and they do not believe in government jobs at all.