Cylinder head heat crossover?

[Mark Yacavone]

Originally Posted by Shadylane

2020 Rule book: Stock Cars

Cylinder Heads
“Heat riser passage may be blocked from intake manifold side of cylinder head. Blocking passage down in the valve pocket prohibited.”

My interpretation: don’t block anywhere down into the head, but that’s just me. I would hate to get busted for plugging the head when a thin piece of stainless will be sufficient.

Kelly

Kelly, As long as the plug is recessed a tad and not reshaping the port, it's fine. We've been doing them that way for year....Hettler /Kadar/ Watters , and others.

[older racer]

hi, I found .015 stainless sheet works excellent. used same ones for last 10 years, has never burned out or blew a hole through it. mine are 2" by 2 1/2 "just food for thought.

[Rory McNeil]

On my 390/427/428 FE Fords, I have always blocked the exhaust crossover opening in the intake gaskets with a piece of an old butter knife, trimmed to fit inside the slot in the gasket. I have tried the gaskets with the unopened crossover holes, but they always burnt thru in short order. I always found it interesting that NHRA will not allow you to fill the head passage down into the bowl, yet the approved Edelbrock heads have no provisions for the crossover passages at all, but thats OK.

[Dwight Southerland]

Originally Posted by Rory McNeil

On my 390/427/428 FE Fords, I have always blocked the exhaust crossover opening in the intake gaskets with a piece of an old butter knife, trimmed to fit inside the slot in the gasket. I have tried the gaskets with the unopened crossover holes, but they always burnt thru in short order. I always found it interesting that NHRA will not allow you to fill the head passage down into the bowl, yet the approved Edelbrock heads have no provisions for the crossover passages at all, but thats OK.

NHRA will allow you to fill the passage as long as it does not extend into the bowl and make an extension of the port ceiling surface. I used Plaster of Paris poured into the crossover passage to within about 1/2" of the port. Usually wadded up tissue stuffed into the passage from the port side served as the boundary. Once it was heated, it was like ceramic. Never had a problem.

[Mike Taylor 3601]

I have always used zinc...that's what Mondello sold....
I buy a ingot of zinc alloy from Mc Master Carr industrial supply it is about 12'' long 3'' wide and 2'' thick will do 2-3 sets of SBC.
Olds might get 2 sets out it..
next set I do I may melt down some old pistons since I accumulate about 6-8 55 gallon drums a year that I scrap...
I have blocked off a SBC intake.. I filled all the heat riser and EGR passages...
intake was cracked under carb so I filled it to prevent vacuum leaks to EGR passages and it has been through teardown....
I think filling head is better to keep heat out of heads

[Ron Miller]

Originally Posted by Mike Taylor 3601

I have always used zinc...that's what Mondello sold....
I buy a ingot of zinc alloy from Mc Master Carr industrial supply it is about 12'' long 3'' wide and 2'' thick will do 2-3 sets of SBC.
Olds might get 2 sets out it..
next set I do I may melt down some old pistons since I accumulate about 6-8 55 gallon drums a year that I scrap...
I have blocked off a SBC intake.. I filled all the heat riser and EGR passages...
intake was cracked under carb so I filled it to prevent vacuum leaks to EGR passages and it has been through teardown....
I think filling head is better to keep heat out of heads

Mike, A machine shop that I did business with did just that. They were a low buck shop. They used a Colemen camp stove to heat a cast-iron skillet and melted down the old cast pistons. I know they did this in some Oldsmobile heads and maybe even some Cleveland heads. Also in early December, they sold 4 to 5 barrels full of old cast pistons to a scrapper. The money earned would pay to throw a Shop Christmas party. I miss the shop, lots of Good Times.

[Mike Taylor 3601]

Originally Posted by Ron Miller

Mike, A machine shop that I did business with did just that. They were a low buck shop. They used a Colemen camp stove to heat a cast-iron skillet and melted down the old cast pistons. I know they did this in some Oldsmobile heads and maybe even some Cleveland heads. Also in early December, they sold 4 to 5 barrels full of old cast pistons to a scrapper. The money earned would pay to throw a Shop Christmas party. I miss the shop, lots of Good Times.

I have bought a new set of slicks past 4 years and bought my Hans device a few years ago with my scrap money...I have a 02 S-10 and a 4'X8' single axle trailer I haul it on.. I have pulled on the scales @10,400lbs before,the 10 and trailer weigh about 4200lbs....
the scrap yard is only about 3-4 miles away and I go about 25-35 mph and I have been nervous if I would make it there...