Piston to valve contact on mock-up....What now? HELP PLEASE!

streetgrande69

Founding Member
Nov 2, 2002
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Splendora, Tx
ALRIGHT GUYS NEED HELP HERE. FIRST I'M CONFUSED. I DON'T KNOW HOW TO CHECK MY VALVE CLEARANCE IF I DON'T KNOW WHAT MY PUSH-ROD LENGTH IS SUPPOSED TO BE.
HERE IS WHAT I DID....
ASSEMBLED THE HEADS
ASSEMBLED THE SHORT BLOCK
LINED UP THE DOTS ON THE TIMING SET
PLACED CLAY ON THE PISTON FACE
LOOSENED UP ONE SET OF ROCKERS AND INSTALLED 2 STOCK LENGTH PUSH-RODS
TIGHTENED ROCKERS BACK UP
INSTALLED THE HEADS WITH GASKETS
SNUGGED DOWN 4 HEAD BOLTS TO HOLD IT IN PLACE.
ROTATED THROUGH 2 CYCLES
FELT SMALL RESISTANCE
STOPPED REMOVED HEADS
FOUND VALVES TOUCHING MY PISTONS AS EVIDENT FROM THE CLAY
BOTH PUSH RODS ARE BENT

SO DID I TIGHTEN DOWN ON THE ROCKERS TOO MUCH? HOW WOULD I KNOW? WHAT IS MY NEXT STEP? I'M PRETTY LOST NOW. I THOUGHT I HAD IT FIGURED OUT BUT NOW??? WHAT COMPONENT DOESNT MATCH?


ANYWAY, HERE IS MY SET-UP
STOCK RODS
STANDARD THICKNESS HEAD GASKETS
ALL THE REST IS BELOW

PISTONS
PROBE PART #12355-030


FIRST PISTON LISTED ON THIS PAGE
http://www.probeindustries.com/Pistons/Pistons_SRS/Ford/351W/UPDATED/Ford_351W.htm


ROLLER ROCKERS FROM SUMMITT

Brand: Competition Cams
Product Line: Competition Cams Pro Magnum Roller Rocker Arms
Rocker Arm Ratio: 1.6
Rocker Arm Style: Full roller
Stud Size: 7/16 in.
Rocker Arm Material: Steel
Self-Aligning: No
Rocker Arm Body Style: Standard
Rocker Arm Nut Style: Polylock
Slot Style: Long
Slot Width (in): 0.562 in.
Maximum Spring Diameter (in): 1.500 in.
Rocker Arm Finish: Natural
Quantity: Sold as a set of 16.


CAM "K" KIT FROM SUMMITT RACING
Brand: Competition Cams
Product Line: Competition Cams Xtreme Energy Cam and Lifter Kits
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,600-5,800 RPM
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 224 int./230 exh.
Advertised Intake Duration: 268
Advertised Exhaust Duration: 280
Advertised Duration: 268 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.510 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.512 in.
Valve Lift with Factory Rocker Arm Ratio: 0.510 int./0.512 exh. lift
Lobe Separation (degrees): 110
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
Grind Number: FW XE268H-10
Computer Controlled Compatible: No
Lifters Included: Yes
Lifter Style: Hydraulic flat tappet
Valve Springs Included: Yes
Outside Diameter of Outer Spring (in): 1.437 in.
Retainers Included: Yes
Locks Included: Yes
Valve Stem Seals Included: Yes
Timing Chain and Gears Included: Yes
Timing Chain Style: Double non-roller
Assembly Lubricant Included: Yes
Pushrods Included: No
Rocker Arms Included: No
Gaskets Included: No
Quantity: Sold as a kit.

HEADS
WORLD WINDSOR SR CAST IRON
WRL-053040-1


Brand: World Products
Product Line: World Products Windsor Sr Cylinder Heads
Cylinder Head Style: Assembled
Cylinder Head Material: Cast iron
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 64
CNC Machined Combustion Chamber: No
Intake Runner Volume (cc): 200cc
CNC Machined Intake Runner: No
CNC Machined Exhaust Runner: No
Intake Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Location: Standard
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.020 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.600 in.
Valve Springs Included: Yes
Maximum Valve Lift (in): 0.560 in.
Outside Diameter of Outer Spring (in): 1.250 in.
Damper Spring Included: No
Number of Springs Per Valve: Single
Retainers Included: Yes
Retainer Material: Chromemoly steel
Locks Included: Yes
Lock Style: 7 degree
Valve Stem Seals Included: Yes
Valve Stem Seal Style: Ring and Band
Rocker Arm Studs Included: Yes
Rocker Arm Nut Thread Size: 3/8-24 in.
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Guideplates Included: Yes
Guideplate Pushrod Size: 5/16 in.
Accessory Bolt Holes Drilled: Yes
Valve Guides Included: Yes
Valve Guide Material: Cast iron
Valve Seats Machined: Yes
Valve Seat Machine Style: 3-angle
Valve Seat Material: Steel
Steam Holes Drilled: No
Oiling Style: Through pushrod
Machined for O-Ring: No
Heat Crossover: No
Quantity: Sold individually.
Notes: Designed for hydraulic camshafts


ROCKER STUDS
100-7101

Brand: ARP Automotive Racing Products
Product Line: ARP High Performance Series Rocker Arm Studs
Base Thread Size: 7/16-14 in.
Rocker Arm Nut Thread Size: 7/16-20 in.
Guideplate Locator Shank: Yes
Rocker Arm Nut Thread Length (in): 1.000 in.
Effective Stud Length (in): 1.900 in.
Base Thread Length (in): 0.750 in.
Quantity: Sold as a kit.
 
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tylerrocks

New Member
Oct 13, 2005
514
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Big Spring, TX
valve reliefs probly too small for 2.02 valves. is it possilble that the timing dots are not lined up correctly? has the block been decked or heads milled?

Tyler
 

69Rcode_Mach1

Active Member
Apr 20, 2004
1,473
1
37
Salt Lake City, Utah
I would use a pushrod length checker to make sure you are getting the proper geometry after you are done mocking it up and want to really run it, otherwise you will mushroom the tips of the valves. If you are having contact, then you need to yank those pistons out, and take them to the machine shop to have them notched. You need atleast .1" of clearance to account for expansion of metal and whatnot. Hope this helps.
 

1320stang

Founding Member
Nov 13, 1998
4,268
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Edmond, Oklahoma
community.webshots.com
blkfrd has the info you need. SoCal has a good question in is it a stock crank? (you said it has stock rods) 69Rcode offers good advise in getting an adjustable pushrod length checker, your heads aren't stock Ford heads. Tyler offers a good question, but I think with it being a 351w, those pistons should clear a 2.02" valve.

You had the crank at TDC if the dots were lined up (or 180 out) and both pushrods should be on their base circle (the opposite side of the bump on the cam, takes up about 270 degrees of the cam) but you have to make sure the rockers are adjusted correctly. You have studs and poly locks, you could have the rockers too far down on the stud, you don't just tighten them back down.
 

69Rcode_Mach1

Active Member
Apr 20, 2004
1,473
1
37
Salt Lake City, Utah
blkfrd said:
You gotta adjust the rockers correctly. First you gotta get the lifters on the base circle of the cam and adjust the rocker until you get the hydraulic lifter cup fully compressed or get two solid cam lifters and adjust the rockers until you can't turn the pushrod easily with your fingers. If the pushrods are so long or so short that the roller is rolling off of the valve stem then you need a different pushrod length for this test.

You can get the lift figured out properly by converting your old hydraulic lifters to solid. What I did was take the plungers out, and filled the center of the lifter with JB weld. That will allow you to have a solid lifter, and get accurate clearance numbers.
 

streetgrande69

Founding Member
Nov 2, 2002
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Splendora, Tx
Alright i figured it out...you're gonna kill me! i was off on my timing:lol: :rlaugh: :bang: ! Sorry guys but thanks for all the help! You were a ton of help on push rod length though. I ordered the checker from summitt, it'll be here this week! Then i'll check it and i'll be good! :SNSign:
 

rbohm

SN Certified Technician
Apr 12, 2002
6,698
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tucson,az
you might still have some clearance issues. you have 2.02 valves with .510 lift, so your valve reliefs are likely going to be too small. you need .080 clearance on the intake, and .100 clearance on the exhaust. also use a pair of solid lifters and/or a set of valve clearance checking springs.
 

SoCalCruising

Founding Member
Jul 25, 2000
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It looks like those pistons have reliefs for large valves - just from the picture, but the -4cc volume of the reliefs seems small. Do you know for a fact what size valves the reliefs were cut for?