spdjnky

I am in the process of putting my engine back together after doing the head gasket and noticed that my head has the oval exhaust ports but my manifold has round ports? I didn't notice this when I re-built the engine 8,500 miles ago.

so my question is...Should i buy new exhaust maniufold with oval ports or will this manifold be okay? Hate to think that's why my headgasket blew after 8,500 miles but i doubt it! Probably something i did!!

mt_goat

I'd shoot EB an email if I were you. http://www.engnbldr.com/

spdjnky

thanks. thats where my rebuild kit came from.

894x4pickup

I think the oval slots have something to do with the egr...If i remember right mine looked the same way, but i dont have any pics right now...do you?

spdjnky

I can take some when I get home tonight and post them up.

BTW...my truck has no emissions on it and eveything has be blocked off. shhh...don't tell anyone!

894x4pickup

Hmmm...same... ill get pics for ya later...Then you can tell us what you think, if you havent already contacted engnbldr...

abecedarian

If the exhaust manifold has the flanges above the exhaust ports for the PAIR manifold (even if they're blocked off), it's the proper manifold.
I wouldn't go to the round manifold- for flow reasons, you want the head and manifold ports as close to the same shape and size as possible.

iamsuperbleeder

I just took my manifold off about 3 hours ago

with pair shaped (or oval, whatever you wanna call it)

abecedarian

Notice the 'exhaust' ports are (?) larger than the ports on the head but at least the PAIR ports are there too.

abecedarian

one has to remember that the PAIR manifold does not 'take' exhaust from the manifold but relies on the pulse passing over the port the suck air through the PAIR system and into the exhaust.

spdjnky

thanks iamsuperbleeder. Thats the same setup on my truck. If I can find the person that borrowed my camera I am still going to take pics.