Dizzy Sorted, Pushrod Trouble Now :(

[67Rolla-Ken]

Felix, what did you use?????????

[Felix]

This is what I did:

 

My (orig 5k) hydraulic lifters had the circlips removed and the guts emptied out. The pushrod seats were dropped back into the bottom of the lifters effectively making them solids.

 

3k (early shorter bigport type) pushrods are used with 4k adjustable rocker gear on a 5k head.

 

Ideally the oil gallery to the lifters in the block should be restricted/blocked, but I never got around to it. Never had any oil pressure problems at all, but I did shim the oil pump bypass spring approx 3mm to up pressure when I put it all together.

[camerondownunder88]

I have converted my 5K with 5K head and double squish dished pistons to solid lifter :)

 

I run 3F lifters, 4K-C push rods and 4K rocer arms 5K rocker supports and springs etc.

 

Easy conversion all off shelf parts. Will need to grind under side of rockers down to squeze push rods in but TRD manual for 3K they do this to get weight down so is a plus all around.

 

Cameron

[67Rolla-Ken]

Ok, both options require me to change my setup... Is their any reason why my holden lifters/ 3k rocker assembly won't work if I get the correct size push rods??

[Felix]

It should work fine with appropriately sized pushrods. The only problem might be finding an off the shelf solution. You might have to get some custom made.

 

I guess you could always make a checking pushrod using an old K series pushrod. Cut it in 2, trim to length, tap them, install a threaded rod with some locking nuts and adjust the length to suit. Use this to determine the proper length and get some custom ones made up. Something like this:

 

Edited May 11, 2009 by Felix

[camerondownunder88]

will work if you get the right sized push rods.

 

3K and 4K and 5K rockers shafts, springs, rocker arms are usually 100% the same.

 

Only down side of 3K gear is it has aluminium rocker posts and the posts heat up heaps and expand more and valve clearance goes to shit.

 

Just find the right length push rod. Also millions of different lengths and cup shapes and all in K motors so start looking there might find something.

 

Cameron

[Felix]

K motor pushrods won't work. AFAIK the pushrod cup in the chev lifters sits a lot higher than what it would in a k series solid lifter. A12 pushrods are about and inch shorter than 3k ones from what I've seen in pushrod catalogues.

[67Rolla-Ken]

OK will get the A12 push rods shortened.