Hi Guys,

Did a dummy assembly to check out push rod lengths etc with something I am putting together.

The heads came with dual valve springs. Previously running standard 1.1 lifters.

This time I was looking at 1.4 lifters.

Running an AP3 cam (lift 318" - dont know if that is before or after valve clearance).

I turned it over and it bent a push rod.

Is this normal?

Im thinking about going back to standard valve springs as I am not planning on reving it hard (thinking 5000 on Sundays).

Any thoughts? Is it normal for standard push rods to bend?

Cheers

Newt

The dual springs will requir chromoly pushrods

Thats a good question Lee.

I have no idea where the engine came from. My guess is that it was professoinally built in the 1990s (if not earlier) (its got welded heads to relocate the spark plugs etc) (Valves 40x35.5).

The heads had also been flycut with the pots raised about 1.5mm.

The only identifyer on the case is the number 916 stamped on it (on top, on both halves, betweeen the fly wheel and the fan shroud).

Newt

The numbers on the case you speak of are identifing the two halves as a pair.

The dual springs are necessary for some larger cams and more rpm.... any engine is a carefully matched combination of components.

If the cam and lifters are of good quality, and quality oils are also used, NO premature wear will occur.

Thanks guys,

Figured out what was wrong. It was binding on the inner spring.

Something I hadnt seen before.

Cheers

Newt