pushrod holes in block
Turbo Mini Forums

Ive always had slight witness marks on my pushrods where they are contacting the block, have any of you lot ever opened them up a touch for clearance?

I seriously doubt it!

I had a chat about this with my engine builder. (Builds miglia and historic engines) He used to try to use custom push rods or open the holes up, but it ended up being more trouble than it was worth according to him. My engine also have these tiny marks on the pushrods

Phil’s your man for the best idea, but didn’t andy have have to sleeve one head as it went though? I seem to remember on the post there wasn’t much meat?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

In my experience, there's loads of meat in the block, unless you've ground a load off the outside if course,

I think I ran a 14mm drill trough to clearance for carbon pushrods.

Is there not pics of a chopped up block somewhere?

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

Thinking about it, they are also close at the top of the head, it might have been the head that was troublesome to enlarge.

That said, mine do not touch on dry build, but still comes up shiny after use. Due to slight bending/vibrations i guess, does the block act like a support for them? Do we risk bent rods if something i done to avoid them touching?

Looking at the two outermost, they are slightly larger than the rest anyway. Im only thinking of opening them maybe 20 thou or so and probably not all the way through but maybe just the top 1 inch

I seriously doubt it!

The blocks are a bit variable and the pushrod holrd at some small angle or some are ( if you were going to jig it up). I have bigger diameter lifters in my historic racer .875 i think. ( it is possible to go through and need to sleeve, but for the rubbing just file away ..... no problem and indeed better to put the mind at ease. I have seen a few of these, using OEM and aftermarket rods, i think it is related to rpm????

I've had rubbing marks, but it appeared to be they were form the head gasket miss match as the marks were at that exact place on the rod, this only happened on my super
high lift Nitrous cams.

carl

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Theres a bit in Vizards Bible about the carbon pushrods isn't there? Does it mention drilling them out?

hi lift cam rate , another possibility, ( good thinking)
the head gaskets on the issues i have seen are the MLS cometic ones, various thickness and all have had the block slightly recessed so that silly press rivet doesn't interfere with the mating surface. Mr K Calver does some oversize lifters.. but as Paul mentioned the rubbing is usually the top of the block end