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My machinist told me when he has checked those that are SCAT balanced, they are not as well balanced as he likes. Course maybe he likes doing the work to pay for his machine. Just an FYI, the flywheel for external balance is on the spendy side.

Been off the forum for a bit working on my daughter's house so she can sell it. Hot market she had offers above asking before we were done. Just got Harland Sharp roller rockers to solve issues I was having with the stock valve train. I'll be posting on my build thread listed below.

At one time I contemplated a big block. I love the low RPM torque. Cramming one in to a tight space did not appeal, so I decided to do a very cost effective "junkyard 360" which upgrades heads, intake carb and cam, leaving the shortblock untouched. I still think that's a good proven pathway. It...

No pedestals in the 60s right? I think you are referring to the LA style shaft rockers.

That's some interesting stuff. I'm having trouble understanding how stock rockers are used with a non-stock fulcrum and poly locks. That had been my understanding. When I looked at what was happening with .515 lift I did not like the look. With that and my .020 variability in valve height I...

Thanks for that. I'm not sure if it was you who posted that experience before. If not that makes two. I do like their design. What valve covers are you using?

I did not know that was possible. Google shows it works. Thanks. Still debating which rockers.

Thanks Rob. Read all that a while back, been in contact with Mike. No answers to be had for Magnum heads. I spoke to PRW today, they minimize any concern about weakness without a girdle with my setup at about 300 lb open. Also found they likely to not fit under standard valve covers. I have seen...

Reviving this for opinions. I was planning to use stock rockers but just not liking how things look. With a .515 lift cam the rocker tip sits with more angle than I like with the valves closed. With shimming up the pedestal I get too much angle with valves open. What I mean by this is the rocker...

The pistons are at the machine shop. Meanwhile I'm working on the valve train, in particular the pushrod length. I'm going to transition the conversation back to my build thread, so please check that out and offer any helpful input that you can: Project Frog Princess

I adjusted the dish volume for 0.020 shaved off from the 26.5 I measured to 25 cc. This is the CR I had in mind.

No apologies needed. I appreciate your taking time to help out. I spoke to the machinist today. He also went over the CR. He was apologetic about the 0.005 error on the decks and is going to shave the pistons steps on the lathe by 0.020 or so at no charge. I'll be measuring the height above deck...

I put a screen shot of the compression calculator in post 102. How I did the CC accounting for the step and dish is in post 115. A 0.070 gasket puts it at 9.5. All my numbers are the averages taken from rocking the pistons. Thanks for asking.

I'm still not clear what you're trying to tell me about quench, piston clearance and head gasket thickness. I'm getting old. Brain is creaky. Thanks. You're right about that. Next time, if there is one, I'll be prepared.

Yes sir. Kinda goofy pistons. Hindsight is 20 20. I read all different methods to CC. The only thing that made sense to me was to start with the highest surface at zero deck. Down 0.5". Subtract measured volume from calculated 0.5" cylinder volume. It treats everything below the upper step as a...

I appreciate your input. I've got all the books but the help here makes a big difference. I enjoy taking time doing the measuring. I was only considering 0.005, not 0.050. Just enough to even them up with minimal effect on balance or compression. The block was supposed to be squared. I don't...

1 = 0.020 2 = 0.019 7 = 0.025 8 = 0.024 Those are the averages with rocking the pistons. I may take 7 and 8 down by 0.005 with sandpaper and a glass plate so I can use a 0.060 gasket. I'd like my compression a little higher. First I'm going to clay the valves in case that dictates the gasket.

I've done the 4 corners. The block tapers 0.005 front to back. The result is the number 7 cylinder has a protrusion of 0.025. That's after swapping pistons, putting the shortest in that position. Cometic makes a 0.070 gasket. Looks like I'll need it. Not cheap. Anyone know what that will do to...

Half inch down from where the step up is flush (0.520" down from TDC) is 131 cc.

Edit So I did some measuring of things. Piston to deck stats: Step up is 0.020 above deck. Piston rim is 0.070 below deck. Dish is 0.150 below deck. I figured out KB uses the step up portion as the compression height by measuring from the pin hole, adding half the pin diameter. Pin...

Up in the panhandle. God's country :) Truth is I'd like your shorter winter.

Gibsons in Spokane Valley. Recommended by a local guy who’s had them do his Mopar work.

Thanks for that. I’m going to do it. The pistons are recommended for closed chamber heads. Hughes sells a 408 package for magnums with these pistons. They advise a thicker gasket if necessary but don’t give limits on how much protrusion is ok. They were chosen for the - 25 cc factor to get the...

Thanks. I have RHS heads (closed chambers). I'll have to get with the machinist who sold me the stroker kit and pistons. I should not be doing any milling. The machinist has already balanced the assembly. Am I correct thinking if I am to calculate compression using the manufacturer offset of 25...

I repeated the measurements. Repeatability varied by 0.5 degree so I took 4 and averaged. Intake centerline 103. Exhaust 113. That puts my lsa right on the expected 108. Next issue, I have KB-416 step dish pistons, with the raised step at 0.020" above deck. Hughes website says if they are above...

I imagine one degree is not a problem but I'm going to measure again.

For those wondering about the weird broom handle sticking out, I found that with a couple wraps of tape, it fit snug in the lifter bore so I could use it as a guide to get the angle right while using a pushod between the lifter and dial gauge. The other thing I did a iittle different, is I just...

Working on camshaft install. I found that when installed in the zero position my intake centerline was 112, not the 106 I expected from the cam sheet. As expected the exhaust was also off at 105 rather than 110. So the camshaft is retarded. But I think I can make it smarter. Ken had suggested it...

Very nice. Just getting my 408 put together.

I ordered a billet set with 9 keyways from Summit.