Small Block exhaust crossover

[TURNA]

What are you using to block them off?

 

[Olds 307 and 403]

Mine had a plate on 70 when I bought it. Year One, Inline Tube etc have them.

 

[TURNA]

i couldnt find them anywhere

I know edelbrock used to include them with the intake but they are such cheap pricks now

 

[Olds 307 and 403]

Sorry, I was thinking the exhaust manifold cap, my bad. Really, they don't include those plugs anymore? I will do some searching.

 

[Olds 307 and 403]

Edelbrock 2733 Edelbrock Exhaust Crossover Plugs | Summit Racing

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[TURNA]

thank you

 

[Kennybill]

The iron plugs need ground to hand fit each of them. Some have had them "rattle."
I've heard of making "thin" stainless steel plates. Good luck with that. The best is to fill them with Mondello's "famous" zinc-alloy or melt a couple old pistons but do it before the valve job. I have 3 sets that are filled. My C's were done by Shargo Racing, hmmm, 25 years ago. Big valves, ported and filled with zinc-alloy, exhaust divider welded and oil return lines added. $$$ car ran 10:90 with heavy Speed-Pros.
Second set are #6s, 2.05" intake valved, ported, filled intake crossover plus welded exhaust divider. They were done by G&G Engineering in Cleveland. G&G were big time Oldsmobile racers that were always at the Oldsmobile meet @Norwalk. $$$
I have set of #6's partially done, crossover filled, new big valve seats, ported, exhaust divider welded. Empty no valves or springs.
The C's were easy to "dig" out, so I took some pictures. Zinc-alloy.

 

[TURNA]

Yeah been thinking about it

May just leave them open for winter driving

or just weld up the intake

 

[320400425]

What does blocking the center intake do for the performance?

 

[TURNA]

Keeps the oil and intake cool