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I was saying the same thing about his heads. Guides are the cutoff point. If guides are good, you can do the seats and a little shade tree port cleanup. Maybe new valves. Not much more than cutting old valves. But if they need guide work the tab will be in the 800 buck range minimum. At that point since head has no real numbers value to you, incorrect casting number and date, new heads must be considered. Not just for wear-aging. You may find a smaller chamber is preferable with existing pistons. Or mebbe go whole hog with iron or even rectangle ports. 2.25 valves. That is why I wanted heads to stay on. What you don't unbolt, you won't be tempted to upgrade.
Last edited by derekderek; 03-20-2019 at 07:59 PM.
I'd buy some springs, P/R's etc. and enjoy the Car. Granted, I can't be sure that Lifter is not worn (seems decent from the Pic.), but if it's not worn, I wouldn't go further
Now if a 10 second vette was your goal, then I'd say.....
Once I get mine to the strip this spring (if it ever comes) I'll post up my times, I'm hoping for sub 12's (481rwhp, 4sp, 4.11's slippery tires) but we'll see.
Last edited by suprspooky; 03-21-2019 at 10:33 PM.
Well more bad freakin news, found a bad lifter and Cam Lobe while checking cylinder 5 exhaust lift with the dial indicator. Should be .505 lift, measured .357.
Inspected the Cam Lobe and it's nfg
Now you are buying a cam. You going middle of the road or pulling heads, checking dome and chamber sizes to get real CR? And i gotta make a pitch for roller lifter upgrade. Should be easy since you just got bit by flat tappets. Howards has whole kits. Cam, lifters, springs, retainers. Pushrods. 900 bucks. But you gotta watch springs in kits. Double springs won't fit with umbrella seals. Then you are getting guides machined for positive seals. (Would make Mouse happy.)
Nope. Somethings not right there.
.505
- .357
--------
= .148?
You measured incorrectly. That's too much meat missing, over eight of an inch.
Are you really shocked another lifter was bad? Everybody saw that coming. Shocked it was not all 16.
I don't know what that last picture is.
Yes believe it, I measured several times.
What's not to believe? material from lifter plus missing material from cam lobe.
What I don't understand is why the exhaust when all the bent push rods were on the intakes not the exhaust.
Where were you measuring? My solid roller cam is advertised as having a lobe lift of .395. Multiply that by the 1.7 rocker ratio and the gross lift is .671. Both numbers are on the cam card along with all that other information.
Where were you measuring? My solid roller cam is advertised as having a lobe lift of .395. Multiply that by the 1.7 rocker ratio and the gross lift is .671. Both numbers are on the cam card along with all that other information.
I measured from the push rod then multiplied by 1.7
Lift numbers
I can tell you that I dropped $10000.00 from the point you are now at, I'm sure you can do it for less. If you have a matching vin stamp make sure you find a shop that understands keeping the stamp untouched if you have it decked.
Now the real fun begins, so many decisions to make. But you'll know what you have when you're done.
I can tell you that I dropped $10000.00 from the point you are now at, I'm sure you can do it for less. If you have a matching vin stamp make sure you find a shop that understands keeping the stamp untouched if you have it decked.
Now the real fun begins, so many decisions to make. But you'll know what you have when you're done.
This is still not a bad project........you need some real world advice on the setup though......somebody local who can see the details we cannot.
A new valvespring, lock, retainer, seal package with rotator eliminators.....
New cam, lifters, pushrods, timing chain, and if it were me a nice balancer with timing marks on it.......
Take your time and pick out a camshaft AFTER you get the heads squared away.....the 911-16 spring mentioned is a great spring for mild build but you need a speed shop to set this up and tell you really......
I would not go too much bigger than what is in the engine now......and if running a dual spring...the inner needs to be removed for break in......
I have this cam on the shelf I was going to use in a 468 for my pickup but sold it first....brand new in the box with lifters....make you a killer deal. 911-16 spring would work great with this. It is probably very close to what you have already.... https://www.summitracing.com/parts/s...make/chevrolet
Let me know if you are interested.......smokin deal.
Cyl 3:
Intake .292 x 1.7= .497 Exhaust .289 X 1.7= .491
Cyl 5: intake .291 x 1.7= .495 Exhaust.210 X 1.7= .357
Cyl 7:
Intake .290 X 1.7= .493 Exhaust .296 X 1.7= .503
I don't know what cam is in the engine. I bought the car 3 weeks ago. I do know the cam was changed at some point.
As I wrote before ... there's probably sine error from your measuring technique.
SEEMS .. those four intakes are in reasonable agreement.
BUT those four exhausts are NOT ... BOTH Exhausts C#3 & C#5 are WTF Out!
BOTH Cam & Lifters are destroyed You've wiped some 0.080" - 0.090" off Ex Lobe C#5 Alone!
Still don't know what bent Only Intake PRs, but PROBABLY coil bind.
BOTH Cam & ALL Lifters must be replaced. JMO but flat tappets AOK if all valvetrain correct and cam broken-in properly.
Suggest pull heads ... You find out/measure just what pistons you have (CR) ... knowing that you choose cam & springs.
Take heads to shop for Estimate $ to service them & replace springs & replace any bad valve (s) ... we KNOW one has a bad tip.
When shop gives you head Estimate but before their repairs begin ... then You choose what sort of cam ... so shop can set head up for NEW cam.
Suggest you pull pan and check crank & rod journals-bearings ... good to KNOW where you're at on that BEFORE you spend much more time & $.
We have no idea what these heads are. With the rotators i suspect bone stock 2.06 intakes, never got port work. If so, i wouldn't spend much on them. You can get bigger valves, bigger ports and smaller chambers for the price of guides, valves and cut seats.
Last edited by derekderek; 03-23-2019 at 07:17 PM.
03-20-2019, 07:50 PM
