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Hi everyone! I just bought my first corvette in January. It's a 1965 roadster with a 327/365. The lifters have sounded a little loud since I got it so I went to adjust them and found a bent pushrod on #2. I also saw it has 3/8" rocker studs. I thought these were supposed to be 7/16" studs. Which size came stock on these?
Hi everyone! I just bought my first corvette in January. It's a 1965 roadster with a 327/365. The lifters have sounded a little loud since I got it so I went to adjust them and found a bent pushrod on #2. I also saw it has 3/8" rocker studs. I thought these were supposed to be 7/16" studs. Which size came stock on these?
David
3/8" was stock....
also, do you know what cam you have?
If your car started out as a 365, the rocker arms will have an "O" marking instead of a triangle.
Last edited by Mike Geary; May 22, 2016 at 11:38 AM.
Hi everyone! I just bought my first corvette in January. It's a 1965 roadster with a 327/365. The lifters have sounded a little loud since I got it so I went to adjust them and found a bent pushrod on #2. I also saw it has 3/8" rocker studs. I thought these were supposed to be 7/16" studs. Which size came stock on these?
David
Hi Dave, all (early) SB's used 3/8" studs. All were pressed into the castings. This all changed in the later years, some had screw-in from the factory but all were still 3/8". (Had 7/16-14 bottoms)
Thanks, Gary in N.Y.
P.S. The "W" engines had all 3/8" also, the BB's always had the 7/16" screw-in studs, tops and bottoms!
Thanks for the replies. it has threaded studs, not press fit. I'm not sure what cam is in it but when I took the valve covers off half the rockers were way way too loose. The exhaust rocker on #2 wasn't even close to straight on the valve stem.
Hey has anyone ever worked to improve the oiling thru a stud girdle to supply more drip to the tops of the rockers and valves? Or do you think the pushrods supply is 100% adequate? I have tall covers on one engine with drippers and since I never converted those heads to screw in 7/16, I put a stud girdle on the pressed in 3/8 with tall nuts! I have always thought with stamped or even roller tipped rockers and then to cool the retainer and springs, you can never have too much oil! I thought about strategically drilling oiling holes thru the girdle! Just bored nothing better to do today!
Last edited by TCracingCA; May 22, 2016 at 01:56 PM.
Another cause of bent pushrods can be running gummy old gas.. ask me how I know... The intake valves stuck so hard, they bent the pushrods.
Is it intake, exhaust, or both that are bent?
On my LT-1 (1970), it uses "edge orifice" solid lifters to REDUCE the amount of oil coming to the top.. This was all stock in 1970. Apparently at high RPM, with a high volume oil pump, too much oil can get up in the top of the engine, allowing the sump to go dry.
Hmmm... with stock heads and the "racetrack" shaped pushrod holes --I thought guide plates should not be used. Do you have stamped rocker arms?
When using stock heads you enlarge the cast pushrod guides in the heads (drill them out larger and round) and install the guide plates along with the threaded studs. This puts your pushrod alignment closer to the rocker arm.
The exhaust pushrod was bent very slight but the intake looked like the picture from SDvette. It has stepped guideplates which puts it very close to the top of the pushrod
In some cases it's not OK to use guide plates unless the guides in the heads have been drilled or elongated, otherwise there will be interference between the slots in the head and the guide plates..
If you can contact the previous owner(s) they should be able to tell you what you have for a cam. Might be easier than pulling what you have and ID ing it. If it's a solid lifter cam, then you need to know what to lash it at and you can't know that unless you ID the cam.
Last edited by 65tripleblack; May 22, 2016 at 04:45 PM.
Hi everyone! I just bought my first corvette in January. It's a 1965 roadster with a 327/365. The lifters have sounded a little loud since I got it so I went to adjust them and found a bent pushrod on #2. I also saw it has 3/8" rocker studs. I thought these were supposed to be 7/16" studs. Which size came stock on these?
David
David, can you post a couple of pictures of your heads? Try to have at least one focus on the stud, the guide plate and the hole in the head that the push rod passes through to the lifter.
David, can you post a couple of pictures of your heads? Try to have at least one focus on the stud, the guide plate and the hole in the head that the push rod passes through to the lifter.
Good luck... GUSTO
Here are pictures of the head. I think I'm going to install 2 new pushrods, adjust all the valves and do a compression test on the engine (never starting it}. That way I should be able to tell if a valve is bent or if there are other issues. I should have done the compression test when I bought it but it started, idled and ran good until now.
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rocker studs
