the lh port is 1/4 inch larger than the rh one.
now , i'm not an engineer but besides the fact the header bolt hole is cracked. the size of the ports should be pretty close to so that the cylinders would be ballanced w exhaust flow. (not to mention the heads are brand new)
this is his e mail responding to this:
Al-
I apologize for any inconvinience this may of caused you.
Professionally speaking, however, this will NOT cause any problems in how
the car runs or the way the heads perform. I know it doesn't SEEM correct,
but hear me out. As long as the bolt threads in and seats, or tightens, it
will not affect anything. I wouldn't reccomend welding on this and trying to
reshape the port. Head porters often do this, unfortuneatley and although it
seems like the port that is a bit bigger will effect flow, it will not. I
have dealt with this many times, with some of the threads into the port, but
again, as long as you can thread the bolt in for the adapter plate and it
tightens, it will be fine. The oversize port will NOT affect flow in any
way, nor will it hurt power. I have messed with porting enough to know, and
have even made some ports larger due to the way they compare on a bench,
flow will not be altered. Please understand, neither of these situations
will hurt the engines ability to breathe. It is not being said for any other
reason but it is the truth. My reccomendation would be to bolt it up and run
it. As long as the gasket seals, which it will, then run it. I have dealt
with this when customers bring me their stuff, and have a larger port here
and there which they do for testing purposes to see if the port wants to be
that size, often times it just doesn't flow any more air. But it doesn't go
down either, and does not hurt power. I would not steer you wrong and I am
not saying to leave it because I don't want to take care of it. But I am
saying whoever says it will hurt power or NEEDS to be fixed is wrong. I have
been forced in the past to use alot of "junk" by other builders with worse
problems than these, and it works. I would run the countersunk bolt in for
the adapter plate, tighten it, and bolt the headers up. This will not hurt
performance. The few threads that broke through will not leak, or come apart
and will not strip out. You will cause more damage welding on that. Then
having to report it, and relocate the bolt hole, and rethread it...is just a
waste of money. I do NOT run junk, nor would I tell you to run it if I
thought it wouldn't work. I am telling you to run it because I know it will
not hurt the cars performance. As for haveing to use adapter plates, every
head has either a std. header flange or a Stahl header flange or in this
case, both. Why the Stahl headers you have will not bolt up, I have no idea.
They should be all the same. They are not spread port exhaust so the headers
should fit. Yes, you did tell me you have a Stahl pattern with a big tube,
and these do have a Stahl pattern, why they don't bolt up could not be
foreseen. There is nothing wrong with running the adapter IF you have to.
Please understand I will always do what I have to inorder to make a customer
feel satisifed. But I need you to trust me on this. The few threads that
went through will NOT hurt, nor the fact that the one exhaust port is a bit
larger. I have had to run them like that before with no problem. The tube is
big enough, and the slight overhang the header may have over the port will
not hurt the performance. This setup was already done from a customer that
was going on his engine before he decided to go with a bigger head. Again, I
would not tell you to run this If I felt this would hurt anything. I know it
may not seem right, but it will not hurt. Bolt it up, and run the car. You
will see. I will have a better idea on when the pushrods will be done
tomorrow..
Joe
Maximum Race Engines