Merlin oval port iron heads for a bolt on upgrade.

So you guys think the edelbrock heads had nothing to do with this happening. I like that answer. One thing I didn't mention before was prior to this happening the engine had a problem with the oil temp rocketing to 280+ if I ran hard at all. Could this also have been caused by water infiltration? I always thought maybe the seat pressure were too high, but not sure. I checked the clearances (plastigage) on the rods and mains last winter and they were perfect.n Ring gaps and piston clearances were good too.

On a different note, if I go with these rect port heads, would the cam grind need to be different? I was going to go with a comp cam 226/236 @.050 and .554/.547.

BT

Tinker... how can I get a hold of JimV?

BT

BT,

If you want to talk this over with a real sharp guy who owns a prominent engine shop here on Long Island call Lab @ 631-226-2234 ask for Lee. He will give you good advice.

Got it Checkmate, thanks. I'll see what he says.

BT

Jim Valako is in Grand Rapids, MI. His number is 616-735-0800

My advice would be to NOT port or machine your small oval port heads. I have done this to two sets and both cracked between the intake nad exhaust valves on #7 and #4

BT;

If you talk to Lee, let us know what he has to say.