429 pushrod length
Thread Starter
|
New User
Joined: Feb 2002
Posts: 5
Likes: 0
From: bridgewater canada
429 pushrod length
Hi all!!!!
this will be my first post I have been lurking for awile trying to find some info on the 429 .Here is my story I have purchased a jet boat with a blown up 460 I found a 1969 429 2 bbl out of a lincon so I reaserched everything I could on this site for information then built the engine I have the 10.5:1 bottom end completly did the c9ve heads /milled 0.230 off the stud boss and put on the guid plates with comp cams roller rockers msd billet distributor 6al box, blaster coil,performer rpm intake, and a "jet boat A impeller comp cam with .494 lift.everything was going good until I got to the pushrod length... if I (and the machine shop) have calculated correctly to make the geometry line up I am going to need a pushrod lenght of 8.350 to 8.400 but what I don't understand is why?? I milled the difference off the stud boss that the guide plate would have changed so why would I have to go to such a short pushrod to correct misalignment ?? does this sound reasonable to the ford guru's I must admit that I am not up on bbf's but this is what is in my boat and I dont want to change everything else around it. Any & all info would be greatly welcomed.
quig.
this will be my first post I have been lurking for awile trying to find some info on the 429 .Here is my story I have purchased a jet boat with a blown up 460 I found a 1969 429 2 bbl out of a lincon so I reaserched everything I could on this site for information then built the engine I have the 10.5:1 bottom end completly did the c9ve heads /milled 0.230 off the stud boss and put on the guid plates with comp cams roller rockers msd billet distributor 6al box, blaster coil,performer rpm intake, and a "jet boat A impeller comp cam with .494 lift.everything was going good until I got to the pushrod length... if I (and the machine shop) have calculated correctly to make the geometry line up I am going to need a pushrod lenght of 8.350 to 8.400 but what I don't understand is why?? I milled the difference off the stud boss that the guide plate would have changed so why would I have to go to such a short pushrod to correct misalignment ?? does this sound reasonable to the ford guru's I must admit that I am not up on bbf's but this is what is in my boat and I dont want to change everything else around it. Any & all info would be greatly welcomed.
quig.
Elder User
Joined: Jul 1999
Posts: 877
Likes: 2
From: Missouri
429 pushrod length
I have almost the same set up ,but with Crane roller rockers.I think my pushrods are the same as yours.I'll look tommorrow as I saved the box they came in.The stock length is 8.550 subtract .200 and you have 8.350.Did you use a length checker?I used one on my motor and bought the length I needed.
Dennis
1979 F-250 4x4 460 4-speed 33"s
1977 Highboy 429 4-speed 35"s
1969 Ranger on a 1978 F-250 4x4
frame 466 560HP 4.10's 33"s
Dennis
1979 F-250 4x4 460 4-speed 33"s
1977 Highboy 429 4-speed 35"s
1969 Ranger on a 1978 F-250 4x4
frame 466 560HP 4.10's 33"s
Thread Starter
|
New User
Joined: Feb 2002
Posts: 5
Likes: 0
From: bridgewater canada
429 pushrod length
Hi Dennis ... Yes I did use a push rod length gauge and came up with approximatly the same length. What I can't get my head around is why would they be .200 shorter?? I milled the stud boss the thickness of the guide plate so should that have not compensated .?? I really don't want to make a mistake here... I have done a search and read all the threads pertaining to this subject but really have not found a good answer. As long as it works I really don't care but I don't want to burn the guides out prematurly
.Could you tell me what kind of HP I might expect from this combination 
.Could you tell me what kind of HP I might expect from this combination 
Post Fiend
Joined: Nov 2001
Posts: 6,748
Likes: 118
From: Tallassee, ALabama
429 pushrod length
Just because you mill the head for the guide plate between the head and the stud nut, it will not change the length of the push rod. This milling makes sure there is room for the guide plate without the rocker fulcrum bottoming out on the stud's jam nut.
The things that will change the length of a push are lifters that have the pushrod seat/cup at a differnt height than a stock lifter, the base circle of the camshaft is larger or smaller than the stock Ford base circle, the valve length (again shorter or longer than stock valve.
And one thing a lot of people don't consider is grinding the valves. If you have to replace a seat, it might change the length, usually doesn't. But, the more times you grind the valve seat, it theoritically makes the valve longer/the stem above the spring seat is longer the more times you grind them.
The things that will change the length of a push are lifters that have the pushrod seat/cup at a differnt height than a stock lifter, the base circle of the camshaft is larger or smaller than the stock Ford base circle, the valve length (again shorter or longer than stock valve.
And one thing a lot of people don't consider is grinding the valves. If you have to replace a seat, it might change the length, usually doesn't. But, the more times you grind the valve seat, it theoritically makes the valve longer/the stem above the spring seat is longer the more times you grind them.
Thread Starter
|
New User
Joined: Feb 2002
Posts: 5
Likes: 0
From: bridgewater canada
429 pushrod length
thank you for the info ,so if I understand you correctly , once the proper pushrod lenght is established with the rod lenght checker I " should" not have any problems thank you for easing my mind on this . When my new pushrods get here I will report back on how the fit
thank you again
steve.
Thread
Thread Starter
Forum
Replies
Last Post
fiftyfordfloored
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
15
Mar 23, 2015 08:43 AM
46Whizzer
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
2
Dec 23, 2014 08:20 PM
1972 Ford Thunderbird 429 V8
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
13
Apr 13, 2003 09:07 PM
