'65 327/365 Valve Springs?

[Clem Z.]

Re: '65 327/365 Valve Springs?

i just checked my 1958 shop manual and the valve spring installed height is 1 and45/64 which is 1.703 so i think that all small blocks always had 1.700 installed heigth.

[Clem Z.]

Re: '65 327/365 Valve Springs?

i just checked my 1958 shop manual and the valve spring installed height is 1 and45/64 which is 1.703 so i think that all small blocks always had 1.700 installed heigth.

[Chris D.]

Re: '65 327/365 Valve Springs?

Clem,

My admittedly non-GM service manual charts these two different installed heights. Crane Cams literature also lists their stock replacement specs with the same break point.

Normally I would defer to the official manuals. However, the measurable installed height difference in the mating retainer caps (3729363 vs. 3896934)is what cinches it for me.

[Chris D.]

Re: '65 327/365 Valve Springs?

Clem,

My admittedly non-GM service manual charts these two different installed heights. Crane Cams literature also lists their stock replacement specs with the same break point.

Normally I would defer to the official manuals. However, the measurable installed height difference in the mating retainer caps (3729363 vs. 3896934)is what cinches it for me.

[Duke W.]

Re: '65 327/365 Valve Springs?

The 30-30 cam with .485" gross lift at 1.5:1 rocker ratio was used in the 64-65 SHP/FI engines, so I don't think that's it.

Okay, so I have the late springs with the early retainers on my engine. Now I'm wondering if I should swap the retainers for the later version.

Duke

[Duke W.]

Re: '65 327/365 Valve Springs?

The 30-30 cam with .485" gross lift at 1.5:1 rocker ratio was used in the 64-65 SHP/FI engines, so I don't think that's it.

Okay, so I have the late springs with the early retainers on my engine. Now I'm wondering if I should swap the retainers for the later version.

Duke

[Clem Z.]

Re: '65 327/365 Valve Springs?

in 1955 i installed the corvette 195 HP cam in my 55 bel air power pac and i had to change to the springs that came with the cam kit but i used the same retainers. when did they install the inverted steel cups for oil shields? i do not remember if my 55 had them and if they added them later that could be the difference in the retainers to allow for the thickness of the cups so you would have the correct spring pressure. i still have the tool i made to change the springs with heads on the engine. it was a U shaped piece with a hole for the rocker stud,and put it over the stud and cranked it down using a nut on the stud to compress the valve spring. i just fed clothesline into the plug hole with the piston at TDC to hold up the valve. crude but it worked!!

[Clem Z.]

Re: '65 327/365 Valve Springs?

in 1955 i installed the corvette 195 HP cam in my 55 bel air power pac and i had to change to the springs that came with the cam kit but i used the same retainers. when did they install the inverted steel cups for oil shields? i do not remember if my 55 had them and if they added them later that could be the difference in the retainers to allow for the thickness of the cups so you would have the correct spring pressure. i still have the tool i made to change the springs with heads on the engine. it was a U shaped piece with a hole for the rocker stud,and put it over the stud and cranked it down using a nut on the stud to compress the valve spring. i just fed clothesline into the plug hole with the piston at TDC to hold up the valve. crude but it worked!!

[Chris D.]

Re: '65 327/365 Valve Springs?

I wouldn't change a thing. This would be the same as a .040 shim. With the later spring it only bumps the spring forces 10 lbs. and still leaves 0.10" clearance to the coil bind height. Sounds like a better setup for top end. Now you got me thinking I should change my later retainers to the early ones.

[Chris D.]

Re: '65 327/365 Valve Springs?

I wouldn't change a thing. This would be the same as a .040 shim. With the later spring it only bumps the spring forces 10 lbs. and still leaves 0.10" clearance to the coil bind height. Sounds like a better setup for top end. Now you got me thinking I should change my later retainers to the early ones.

[Clem Z.]

tin oil shields

one thing a found is that those old tin oil shields have a problem of cracking and coming apart. i would heat them cherry red with a torch and let them cool to anneal them and this stopped the problem. i guess they worked hardened when they were stamped out. that was years ago and they may have changed by now if still available. i think that a viton umbrella seal is a much better option than the "O" ring and tin shield.

[Clem Z.]

tin oil shields

one thing a found is that those old tin oil shields have a problem of cracking and coming apart. i would heat them cherry red with a torch and let them cool to anneal them and this stopped the problem. i guess they worked hardened when they were stamped out. that was years ago and they may have changed by now if still available. i think that a viton umbrella seal is a much better option than the "O" ring and tin shield.