FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#1
|
|||
|
|||
jig for elongating pushrod holes
Anyone have the jig for performing this step they would be willing to rent?
|
#2
|
||||
|
||||
There is no jig. Plus they really should not need elongated if you use 5/16 push rods. The only reason they are elongated on Ram Air IV is because RA IV have 11/32 push rods.
__________________
1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars |
#3
|
||||
|
||||
There are drill jigs made to do this on some engines. I think it's called a louis tool? It's relatively inexpensive. I have one here somewhere for SBC heads. Unfortunately as far as I know you Pontiac guys don't get one. At least not that I've seen anyway.
|
#4
|
|||
|
|||
There is / was one for Pontiac produced by Paul Spotts, two versions soft and hardened
I bought the soft one and it didnt last long because of side loading of the cutter If i was to buy another one i would work the slot by other means and use his tool as a go no go guage so you know when your done and dont get any surprizes after the head is already on
__________________
If your not at the table you're on the menu A man who falls for everything stands for nothing. |
#5
|
||||
|
||||
Spot Eye by Paul is a fixture that does the oval. I used a grinder and rattail file
|
#6
|
||||
|
||||
Quote:
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#7
|
||||
|
||||
Spotts has the tool.
|
#8
|
||||
|
||||
If you not porting the heads / opening up the push rod pinch then just run a 1/2” drill bit down thru the 4 push rod holes in each head that are the tallest.
In 10 minutes your done!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
The Following User Says Thank You to steve25 For This Useful Post: | ||
#9
|
|||
|
|||
Rattail file works great for the final bit of clearance.
__________________
466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
#10
|
|||
|
|||
This is great to know Steve. I did a little port work, but it was almost exclusively in the bowl area., and widening of the port floor.
|
#11
|
||||
|
||||
You can still widen the pinch like.035" and run down a1/2" bit without going thru the casting.
You will however need a strong drill. A 3/8" chuck model and one of those 1/2" bits that neck down to 3/8" will not get it done unles you use intermediate size bit before the 1/2". If you still want more clearance at the top and have a chamfer bit or a unibit then use that some at the very top of the hole.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
The Following User Says Thank You to steve25 For This Useful Post: | ||
Reply |
|
|