formula31

HM,, well while checking out the springs and such on a set of heads I just got, I realized the guides were just knurled and dont have bronze liners. One head is already on the engine. Should I have the bronze guide liners put in? Is the head gasket on the head I torqued down now junk if I remove the head to get this done?

RickR

If the guides are good I'd run them and replace for bronze after they wear. I'd also mill guides for teflon seals at that time.

You cannot reuse head gaskets.

formula31

Thanks, Thats what I figured. They have teflon seals already but the exhausts werent machined down far enough for my .553 lift clearance. It looks like the retainers will hit the teflon. I may just do it now and be done with it. I will have plenty to do to the second engine next winter.

Crazyhorse

This is just my two cents, but if it were me I'd take the heads down for bronze guides now. I don't care for knurled guides for a couple reasons- knurling reduces the contact area of the stem against the guide which accelerates guide/stem wear, and bronze is a self-lubricating metal while cast iron is not. But like I said, that's my two cents.

formula31

Thanks, Thats what Im gonna do. I will be very busy with the other engine next year and I dont want to have to mess wth this one. Plus, the seal clearance bothers me too. Oh crap, the valves have to be reground after the liners are installed?? I didnt know that? Is that right?

turbo2256

My 2 cents after tearing down and inspecting guide wear on alot of motors I will never run or recomend knurled guides or the thread in guide inserts.

Whiteknuckle

Formula31
Is this the set of 049 heads that you just bought?

formula31

yup

Whiteknuckle

Tom,
I have the other set of those heads. I was told they were Comp Cam springs and hardware set up for an Ultradyne Flat Tappet Cam .550 intake, .558 exhaust lift. We are going to run on the Dyno in about a week, maybe I should take a little better look.

formula31

My springs checked out at 130 lbs at 1.85 which is Ok, just need to be careful breaking them in. I didnt like the shims they had under the intake valve on one head and put hardened ones in there. The other head had good shims. But the clearance between the teflon seal and the top of the valve spring retainer on the exhaust valves was only around .53. The intakes had tons of room. I think when they cut the guides for the seals they forgot that the exhausts get a huge shim to take the place of the rotator. I have to get home to check the other head. I just assumed they would have bronze guide liners in them. Oh well, its only money.