For peeps with T&D rockers...
#1
For peeps with T&D rockers...
What pushrod length are you happy with? I'm getting a good wipe pattern with one shim under the stands and an 8.18"-ish length adjustable. I bought a pair of Ford 351W PRs to check with, Mellings 280 @ 8.152" and a 280A @ 8.212" but haven't had a chance to check them out yet.
The ball-ends are type "H" which have 5/16" diameter ***** with 270° of the ***** exposed. Is this the end I want? Once I get it narrowed down, I'll order a set of 3/8" Trends or Mantons...
The ball-ends are type "H" which have 5/16" diameter ***** with 270° of the ***** exposed. Is this the end I want? Once I get it narrowed down, I'll order a set of 3/8" Trends or Mantons...
#2
I ended up going with a Manton 3/8" pushrod only 7.070" in length. This is an LS3 based 427 with L92 heads with a very light skim on the heads. We did not have to add any shims under the rocker pedestals. Camshaft is a Cam Motion low lash solid roller with 1.7 rockers. Morel solid roller lifters that emulate the factory LS7 lifter.
#4
I'm running a Cammotion LLSR with Morel 5452 lifters. Trying to see if (why?) my pushrods being over 8" long is normal. My block's been decked and the heads milled too. Think I'll drop in a stock lifter bucket and some hydro lifters and see if that gives me any clues...
#5
Didn't even have to stick them in, all it took was one look. After measuring, the pushrod cup on the factory hydraulic lifter is 0.825" taller than on the 5452's (these Morels also have a 0.750" wheel). I did get a slightly better wipe pattern without the shims, and will end up with the 8.152" length. Not sure I can fit 3/8" rods, the holes have already been hogged out but the inside radius of the intake port is really thin there and these 5/16" rods are only a couple thou from touching...
Also, the T&D stand bolts stick about 3 threads into the intake ports. Should I trim them that much to keep the airflow a bit cleaner?
Also, the T&D stand bolts stick about 3 threads into the intake ports. Should I trim them that much to keep the airflow a bit cleaner?
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#8
Not sure if I can get a 3/8", or even a tapered 3/8" in there, as a 5/16" is just a couple thou off the short-side intake wall and that wall is very thin.
Anybody got input on the Ford "HH" ends? These are 5/16" ball tips with 270° access...
#11
A shorter PR would obviously have less flex, buuut, the lifters Kip sent are almost 7/8" shorter than a stock hydro lifter. So, it is what it is...
I'm concerned about the port wall thickness. The PR holes have already been hogged out and the wall is pretty thin there. I may go ahead and get the 3/8" rods, see if they rub there, and deal with it. It's hard to see down the hole and gauge what clearance there is...
Any idea if those Ford "H" style ball-ends are OK to use and/or get accurate measurements from?
Any idea if those Ford "H" style ball-ends are OK to use and/or get accurate measurements from?
#15
Old School Heavy
iTrader: (16)
I would feel comfortable with a good 11/32 Mantos with a .120 wall. A 3/8 .080 would be my first choice. And yes, I have severl pair of those calipers. But, I am old timey. LOL
I was able to maintain .125"-.130" port wall thickness with 3/8" pushrods,. but that was with the Dart heads.
Here is me fitting the Dart LS3 heads for T&Ds:
I was able to maintain .125"-.130" port wall thickness with 3/8" pushrods,. but that was with the Dart heads.
Here is me fitting the Dart LS3 heads for T&Ds:
Last edited by speedtigger; 10-21-2015 at 08:54 PM.
#17
TECH Senior Member
iTrader: (4)
Have you considered a double tapered 3/8" pushrod? I used them in my AFR heads because the straight 3/8" wouldn't fit, or so I was warned. My were made from one piece billet steel by Trend. You might be able to buy two double tapered to check fitment and then purchase the other 14 once you confirm fit. Speak with their Tech support, they are very helpful.
I have a link to my installation if you need it.
I have a link to my installation if you need it.