Topic: Valve stem to guide clearance question

[MRieck]

I have plenty of retainer clearance. The seals are .150 from the top of the guide to the top of the seal. The stock honda one I took off are .110. With the after market seals I have .330 from the top of the seal to the edge of the stem where it begins to tapper off. The cam has .350 lift at the retainer, so its pushing the valve .020 into the seal!! With the stock seals I should have .020 to spare. I can't believe nobody else has ran into this problem. The 63a webcam is supposed to have .370 lift. it only has .350 thank God I'de have a bigger problem if it did!! Damn hotrods!!! Anyone else running a high lift cam?

I must missed the fact you are using an early head in your engine. I see 78F and I assume late model F/K keeper grooves. Like I said earlier, the Kibblewhite guides sit lower in the head than the APE guides which helps. Obviously the valve job can have a big effect too.

[Wheelhorse77]

I have plenty of retainer clearance. The seals are .150 from the top of the guide to the top of the seal. The stock honda one I took off are .110. With the after market seals I have .330 from the top of the seal to the edge of the stem where it begins to tapper off. The cam has .350 lift at the retainer, so its pushing the valve .020 into the seal!! With the stock seals I should have .020 to spare. I can't believe nobody else has ran into this problem. The 63a webcam is supposed to have .370 lift. it only has .350 thank God I'de have a bigger problem if it did!! Damn hotrods!!! Anyone else running a high lift cam?

I must missed the fact you are using an early head in your engine. I see 78F and I assume late model F/K keeper grooves. Like I said earlier, the Kibblewhite guides sit lower in the head than the APE guides which helps. Obviously the valve job can have a big effect too.

If they sit lower, is the overall length shorter? I was wondering if that would allow for more radial movement using kibblewhite as opposed to APE?

[MRieck]

I have plenty of retainer clearance. The seals are .150 from the top of the guide to the top of the seal. The stock honda one I took off are .110. With the after market seals I have .330 from the top of the seal to the edge of the stem where it begins to tapper off. The cam has .350 lift at the retainer, so its pushing the valve .020 into the seal!! With the stock seals I should have .020 to spare. I can't believe nobody else has ran into this problem. The 63a webcam is supposed to have .370 lift. it only has .350 thank God I'de have a bigger problem if it did!! Damn hotrods!!! Anyone else running a high lift cam?

I must missed the fact you are using an early head in your engine. I see 78F and I assume late model F/K keeper grooves. Like I said earlier, the Kibblewhite guides sit lower in the head than the APE guides which helps. Obviously the valve job can have a big effect too.

If they sit lower, is the overall length shorter? I was wondering if that would allow for more radial movement using kibblewhite as opposed to APE?

I don't think the slightly shorter length would have a real impact....tehre is still a lot of guide there. It can....and does...have a profound impact on the keeper groove to seal relationship