So I've been chasing a problem for about two years with my 355. You could see it on the dyno and on 1/4mile pass datalogs at the track. The engine would just flatline between 4500-5000. Well.. it never dawned on me in previous lash adjustments, but last night I found #7 Intake lobe to only be lifting about .17 gross. Should be .544. A slow bleeder!

So it's time for a new cam. I was thinking of the Voodoo, but with Lunati's sale from Holley, information seems to be limited on the internet. I found a post that Harold didn't design the Solid Flat Tappet cams for them. Anyone have results with one?

My current cam came recommended by Harold, his own special blend:
Cam: Lunati 01-TF80-TF72
239/247@.050
267/275@ADV
.510/.530 Lift 1.5
.544/.565 Lift 1.6
Valve Lash .016 Hot, .018 Cold.
112lsa, 106 ICL

I have brand new Lunati Dual Springs 73100 on the car. Springs put down about 140 on the Seat and 330 open.

Motor/Setup:
355 SBC .030 over, 2 bolt, Hyper pistons, Balanced to 7k.
Stock Crank 10/10, Polished/peened rods with ARP hardware.
Pro Topline 200cc/64cc heads. 9.75:1 Static compression.
Holley Stealth Ram intake with 58MM throttle body and
Commander 950 Computer.
Dual 3" exhaust with Hooker Aerochamber mufflers.
T56 6Speed Manual Transmission with Spec 3 clutch.

I'm hoping to find something Solid Flat Tappet, similar or better performance, that I can use my current springs with! (hopefully pushrods too, but of course wont know until it's in there.)

Thoughts?

Oh... and I have a dyno competition saturday the 26th. So whatever cam I go with, it's got to be ordered monday and overnighted!

Sure runs good on 7.35 cyl now though! LOL

WEEEEEEEEEEEEEEEEEEEEEEE
Can you break in just the cam, on synthetic? I've got Royal Purple in there now. Would hate to was $45. It's only got a few hundred miles.

First of all those hooker aero chamber mufflers sound great, we have used them also.

I would look at a crane 110921 solid lift cam if its a track car. specs as follows
280/288 @.020 244/252 @.050 .518/.536 106° lobe seperation 102° intake centerline
I will get the cam card and post it

here is the cam card for the 110921, i would try to bump the compression up with a steel shim head gasket if its an iron head, i ran this cam with 10.5:1 in a 327, runs good

Part Number: 110921 Grind Number: F-244/3454-2S-6
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1957 1987 CHEVROLET 8 PERFORMANCE USAGE, GOOD MID-RANGE TORQUE AND HP, BRACKET RACING; HEAVY, PRO ET, SUPER ET, ETC., AUTO TRANS W/3000+ CONVERTER, 10.5 TO 12.0 COMPRESSION RATIO ADV. BASIC RPM 3200-6800
Engine Size Configuration
262-400 C.I. V

Valve Setting: Intake .026 Exhaust .026 HOT

Lift: Intake @Cam 3454 @Valve 518 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 3574 @Valve 536
Rocker Arm Ratio 1.5

Cam Timing: TAPPET @.020
Lift: Opens Closes ADV Duration
Intake 34.0 BTDC 66.0 ABDC 280.0 °
Exhaust 70.0 BBDC 38.0 ATDC 288.0 °

Spring Requirements: Triple Dual Outer Inner
Part Number 96877
Loads Closed 126 LBS @ 1.850 or 1 27/32
Open 320 LBS @ 1.360
Recommended RPM range with matching components
Minimum RPM 3200
Maximum RPM 6800
Valve Float 7600

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 19.0 BTDC 45.0 ABDC 102 244.0 °
Exhaust 55.0 BBDC 17.0 ATDC 110 252.0 °

Remarks:

It's mostly a street car that sees the dragstrip half a dozen times or more throughout the year.

I'm already running the steel shim 1094 Felpro .015 Gasket.

Thank you for your recommendation!

That cam will have a rough idle, if you can stand that it should work good. I ran that cam with 10.5:1 compression but it was a smaller engine than yours so i would think 10:1 and this cam would work good in yours

What brand and part number pistons do you run? You run fel pro or mr gasket steel shims? What are the cc's of the combustion chambers in your cylinder heads, 64cc?

I believe they are Speedpro Hypereu pistons. They are .030 over. I don't recall the part number. Built that part of the motor.... 5 years ago? ish LOL.

Felpro 1094 Steel Shim.

Bore: 4.032
Stroke: 3.48
CC: 66
Head Gasket: .015
Head Gasket Bore: 4.1
Deck Height: .025
Flat Pistons: 8.65

Quench: .04
CU IN: 355.47
Liters: 5.825
Static Compression: 9.75
Dynamic CR: 8.108

As per Pat Kelley's calculator.

A solid cam is about 8°-10° smaller than stated when compared to a hyd design, I would look at this design for a hyd

Part Number: 110591 Grind Number: H-228/3200-2S-6
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1957 1987 CHEVROLET 8 PERFORMANCE USAGE, GOOD MID-RANGE TORQUE AND HP, BRACKET RACING; STREET, HEAVY, ETC., AUTO TRANS W/3000+ CONVERTER, 10.0 TO 11.5 COMPRESSION RATIO ADVISED. BASIC RPM 2800-6200
Engine Size Configuration
262-400 C.I. V

Valve Setting: Intake .000 Exhaust .000 HOT

Lift: Intake @Cam 3200 @Valve 480 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 3294 @Valve 494
Rocker Arm Ratio 1.50

Cam Timing: TAPPET @.0040
Lift: Opens Closes ADV Duration
Intake 36 BTDC 68 ABDC 284 °
Exhaust 71 BBDC 39 ATDC 290 °

Spring Requirements: Triple Dual Outer Inner
Part Number 96802
Loads Closed 107 LBS @ 1.800 or 1 13/16
Open 289 LBS @ 1.330
Recommended RPM range with matching components
Minimum RPM 2800
Maximum RPM 6400
Valve Float 7000

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 12 BTDC 36 ABDC 102 228 °
Exhaust 47 BBDC 7 ATDC 110 234 °

Remarks:

He's got EFI. A 106 LSA ain't the best idea for that.

He does have EFI? Let me go reread as i didnt see that :o

Yepo. A sweet little Commander 950 setup :O)

Doug helps alot!

Than look at the smaller hyd cam but on a 110° lobe seperation angle, there is a crane solid lift cam on a 112° that is the same as the above 106° but it i think it would reduce to much cylinder pressure

Would like to stick with a solid. Guess I don't have a good reason other than fear of lifter pump up problems and a possible clack on startup!

I enjoy setting lash :O)

then i would look at the one of the following grinds

113841 {my suggestion is to use 1.6/1.5 rockers}
278/288 @.020 238/248 @ .050 .480/.500 114° lobe seperation
duration @.200 is 144/155

12-677-4 {comp cams, also use 1.6/1.5}
274/280 236/242 @.050 .501/.510 110° lobe seperation with 106° intake centerline
duration @.200 is 147/153

The comp cam or crane would have great torque with 1.6 intake 1.5 exhaust rocker

You mentioned info limited on Lunati post sale.

Just call their new place. If it means anything I called them Monday a.m. they didn't have the cam I wanted, said they would make it by Wed., they made it & had it on the way Wed., it came Friday.

If they had whatever you wanted in stock I'd think they would probably ship it Monday. HTH.


Jim