Breakfast in America

[xctasy]

1981 3.3 pushrods, non adjustable hydraulic lifters. Rockers with cups



1963 170 pushrods, adjustable, used for hydraulic lifter 1967 200



Same length, but the US versions have ball ends on both, and the Aussie versions have cups on the top and rockers with balls. The last T, B and X code engines (from 1978, 1980 and 1983 respectively) onward had the lowest rocker cover, and windage trays on the them might come in contact with high lift cams and adjustable valve gear.

If your changing over to adjustable valve gear, note that the pushrods differ.

 

[xctasy]

The push rods have a nominal length of about 8.012 ball to ball or Cup centre to ball in the case of the adjustables.

 

[xctasy]

A question!

I'm ready to slice 90 to 120 thou off my 170 cylinder head to get my target 30 cc chamber for 12.7:1 compression. If i do it Ak Miller style http://www.classicinlines.com/HA4.asp

That means I have to add the same depth in rocker washers


I read up on head swaps

viewtopic.php?t=1027

and find another pushrod size if I use the stock late model non adjustable rockers. Apparently, there are shorter by 60 thou 7.952" non adjustable pushrods around for another application in the US. Any one know?

Third option, should I look for another kind of shorter hydraulic lifter than the stock item

 

[Gene Fiore]

A question!

I'm ready to slice 90 to 120 thou off my 170 cylinder head to get my target 30 cc chamber for 12.7:1 compression. If i do it Ak Miller style http://www.classicinlines.com/HA4.asp

That means I have to add the same depth in rocker washers

Either that or just go with head studs and you won't have to worry about it.

 

[xctasy]

Cool, I see what you mean on the stock bolts, they'd bottom out.

My orginal phot showes ball and ball 65-83 200, and the Aussie Ball and cup 61-64 adjustable.


On the pushrod side, Comp Cams measure total length on a ball to ball basis i-i=I. 5/16" Tube with 3/8" Welded Ball

http://www.compcams.com/Products/CC-%27 ... %27-1.aspx

My measured 8.012 might have been 7.975, which is their #7865-12, 8.350" tall minus a two half 3/8 balls

I notice they don't service the pre 1965 adjustable rockers for 144-170-200 engines, an A-B arrangment

I thought the 8.280" stock short deck 7811-8 set up for the 9.80" 396 to 454 Big Block Chev would work, but I then noticed our little Fords have 62.5 thou bigger balls than anyone elses

Ricksmol and other Aussie 2V to US 200 swapper noticed that the stock pushrods and matched valve gear resulted in no problems with wear, but that the aftermarket Yella Terra with Holden 186 pushrods wore out. I have other options, but would like to find a US 60 thou shorter 200 pushrod. I can swap to a ball and cup arrangment