Which 1.6 rockers?

[Sean 94z28]

Stock cam and don't want to replace any other components if I don't have to.
GM maybe?

Anybody want to recommend a head gasket. Mr Gasket 5716 ok? Does using this gasket to bump the compression require any other changes?

Any reason to replace high milage lifters (160K) if they appear to be working fine?

Thanks for feedback

Sean

[Craig 94 TA GT]

Comp cams Pro Mag RRs are what I would suggest. Non self aligning with GM guideplates CC chromemoly pushrods, and LT4 valve springs (or better). You will have to modify the support brackets in your valve covers. I suggest squeezing them thin, rather than cutting them out.
If there's no need to replace the lifters, then it might be better to keep them matched with the cam. But I would replace them if you've already removed the intake and have that many miles. A good stock replacement set is Comp Cams 850-16.

[soCalTA]

I have the Comps as well....

[Craig 94 TA GT]

Oh, I forgot to mention, you might as well get the 7/16" set and new 7/16" studs. The thread is already 7/16" in the head. Although it might be overkill on a stock motor, I've felt much safer, especially when taking it beyond 5800 RPMs.

[Sean 94z28]

Wow. That's about $600 or more. My repair/upgrade may just turn into repair only.

Thanks a lot for the info. If you use the thinner gasket do you go to a shorter pushrod?

Thinking what to do...

Sean

[fastTa]

Wow. That's about $600 or more. My repair/upgrade may just turn into repair only.

Thanks a lot for the info. If you use the thinner gasket do you go to a shorter pushrod?

Thinking what to do...

Sean

Unless you mill the heads, you can just use a stock length 7.200" pushrod. What is the listed compressed thickness of that gasket you mentioned?

[Sean 94z28]

Unless you mill the heads, you can just use a stock length 7.200" pushrod. What is the listed compressed thickness of that gasket you mentioned?

This is the only description I got: U/S HD GSKT CHEV 350 LT1 .026"

Best priced source for these items?

Thanks

[fastTa]

This is the only description I got: U/S HD GSKT CHEV 350 LT1 .026"

Best priced source for these items?

Thanks

Your stock static compression ratio is 10.41:1. Going with a gasket with a compressed gasket thickness of .026" will put you at 11.04:1 according to my math. That should give your motor a little extra pep!

Just remember one thing. Due to the fact that you mentioned your motor had 160k on the clock, upping your SCR can and will likely exacerbate any oil leak that you may have. (rear main, pan, timing cover, intake manifold, etc.)

[Craig 94 TA GT]

If money isn't too much of an issue, I would say the $600 is worth it because if you do upgrade your cam and P&P the heads, you're set - that is, if you get a good set of springs. My excuse was for the upgrade was similar - fix the intake leak and get new springs on a high mileage motor. Kevin helped turn it into an awesome project with his great advice

[Joe 1320]

I'm going to chime in here......

I'm not a real fan of major changes on a higher mileage motor. By changing the rockers and springs you are going to changing the rpm powerband slightly higher and that puts more stress on the bearings. Often times that is enough to spin a bearing on high mileage motors. In my opinion, I would just do a refresh..... maybe a new timing chain and stock springs along with whatever maintainance that is needed. My opinion is that the motor will live a longer life that way.

[4THGEN Z]

I'm going to chime in here......

I'm not a real fan of major changes on a higher mileage motor. By changing the rockers and springs you are going to changing the rpm powerband slightly higher and that puts more stress on the bearings. Often times that is enough to spin a bearing on high mileage motors. In my opinion, I would just do a refresh..... maybe a new timing chain and stock springs along with whatever maintainance that is needed. My opinion is that the motor will live a longer life that way.

Agreed....I've had a couple of buddies who did the top end (icluding cam though, such as LT4 hotcam kit) on higher mileage LT1 and shortly after spun a bearing.

[Sean 94z28]

Thanks everyone!

I am not sure how to reply to that Joe. I am aware of that risk. Although I am trying to up the power a bit, I don't intend to go all out. Even if I wanted to, I do not have the funds to support such an effort.

I did not have any intention of upping redline at this point in time. LE1 for the heads, retaining stock cam, and 1.6s were my only plan for now (and some mild, smog friendly, tuning to support it.). Lloyd says he has customers running something similar with pleasing results.

Basically, I can't tear it down this far (heads off) and do nothing for performance. You all know the feeling. There is also no way I can afford to go all out.

Bottom line, I am willing to risk it. Are the LT4 rockers ok? Require new studs?

Thanks again
Sean

[DeWynter]

I am using the LT4 rockers and like them. I didnt want guide plates so theats what I went with. They are not GM parts either I know comp cams or Crane makes them for GM.

[Sean 94z28]

I am using the LT4 rockers and like them.

Did you have to change the studs to 7/16?

thanks

[DeWynter]

No change I just ordered the 3/8" stud version.
12370839 Aluminum Roller Rocker Arm 1.6:1 Ratio

This part number is for the "Set" of Rockers not "single" rockers.