Porting Vortecs???

[88bluestar]

Thank you all for the help! It is greatly appreciated.

[88bluestar]

New dilemma. Pushrods are .025 short, using the blue pro form rocker arm tool. What change would it make using them and straight up or slightly taller rods?

[F-BIRD'88]

The pushrods appear to now the be too short because you now are using a thicker (.039" composite) than factory OEM head gasket. Swap the .039" head gasket for a .015" shim style felpro 1094 gasket and the pushrods will suddenly be .025" longer. If your piston sits below the deck at TDC this is the head gasket U want anyway. Now your real cr will be a bit higher too.

(piston to deck clearance at TDC .020-.025") Felpro #1094 head gasket.

[mag2555]

.025" off from being dead on would not worry me!

[88bluestar]

What about.025 over? I have some .050 taller pushrods sitting around.

[CGT]

I don't think I'd be worried about .025 or .050 if I was using a plastic proform tool to check length with.

[88bluestar]

Worked for me many times over, and never had a failure.

[MadBill]

Pretty sure if you check length via the "90°rocker centerline to valve CL at half lift", one or other of those two lengths will be closer than where you are now.
2X re not trusting the plastic gauge.

[88bluestar]

Power output estimate(ballpark)?

Cleaned exhaust ports but opened the exhaust throat behind the valve, intake side was smoothed behind the valve as well. Rolled back guides bosses lightly. 5 angle valve job with 194/150 valves. 235d isky valvesprings.

750 Holley with 850 base, 1" spacer allowed.....I have an open one and 4 hole one to use if needed. 70/30 mix of 91 octane and 110 race fuel.
2716 Edelbrock intake, porting not allowed
elgin pro stock 1133 cam, 246/246 .050 106/110 -108/advance 4 degrees. 1.5 rockers
.040 2256L forged sealed power piston 5/64. 5/64. 3/16 rings
5.7 stock rod, arp bolts. 10/10 cast crank 3.480 stroke
dirt oval, 1/4-3/8 , on american racer kk704 tires.
.025 below the deck, likely running .039 stock head gasket with a roughly 67-68cc head chamber. 9.3-9.4 comp,
3000-6800 range, with a 7000 limiter

[cgarb]

With it .025 below deck I would have some felpro 1018 steel shim gaskets on that one real fast. Get you some extra compression for cheap. They are decent head gaskets also.

[psychomotors]

With it .025 below deck I would have some felpro 1018 steel shim gaskets on that one real fast. Get you some extra compression for cheap. They are decent head gaskets also.

Or Felpro 1094-even better,lol.

[MadBill]

With it .025 below deck I would have some felpro 1018 steel shim gaskets on that one real fast. Get you some extra compression for cheap. They are decent head gaskets also.

Or Felpro 1094-even better,lol.

Err... yeah, since a 1018 is a 0.041" BBC part...

[cgarb]

My bad...lol. 1094 is the correct number...I work with too many numbers a day sometimes. Staring at a print all day and watching G code will make you number blind.

[psychomotors]

All is well cgarb. I just couldn't pass up the chance to actually know an answer,lol. MadBill , BBF

[MadBill]

My head said "F" but my finger thought it knew better and went with "C"