How would I verify the identity of a red intake manifofold that I recently bought. I was told it was a LT4 intake manifold that has been ported and polished and I would like to see if I got ripped off or not. $500

Also are there templates for the porting and polishing of heads? I am interested in doing this my self and I would like to NOT mess it up. If it seems like to big a task, I am not above having a experianced individual doing it.

Another thing, if I put my CC306 cam in with out tuning or programming, no headers, or anything else of that sort...can I expect it to run like a Ford?

That should cover my questions for a little while(10 min.) Thanx for any help I can get I know this was little long.

-Dan
The long winded one

 

The intake sits higher than the LT1 intake.

 

It should say LT4 on the bottom of it. Cast in.

 

Is the part # 12550630?

Can we assume you have the LT4 heads to put it on?

 

No I dont have the heads yet, I bought just the manifold for now.

 

It will have lt4 on the bottom of it, molded into the metal. Hope all goes well

 

I think $500 is a little high to pay for a real LT4 manifold. Summit has them for under $300. There has yet to be any solid dyno-proven gains from porting / polishing the intake on an LT1/LT4 car.

The easiest way to check is whether or not the intake will seat well on your LT1 heads. If it mates up perfectly, congrats, you got jipped. A normal LT4 intake needs to be milled to match up with LT1 heads due to the mating angle.

Do NOT try to port/polish heads yourself. You are asking for trouble. Anything more that mild deburring of imperfections in the head casting is best left in the hands of a pro.

The 306 is a HUUUUGE cam to run on a stock bottom end (not that it doesn't pull like a mother with the right set of heads and supporting bolt-ons). But you can get similar power numbers out of a smaller cam like a comp XE 224/230 or the LT4 Hotcam. In general running a big cam without any other boltons will leave you wishing you had more power for all the effort you put in. A big cam almost always needs tuning to run to its full potential. But yes, if you drop it in, you will be able to drive your car around, albeit not in tip-top shape.

 

??? I do not consider that correct as stated. Please be more specific, if possible.

Not necessarily!

The most accurate method of identification I am aware of, is the casting #. Casting # is 12550631, one up from part # stated above by Fred.

 

500 you got hit man those things go for 212

 

Remember, it is no longer oem. It is modified (ported). From that point, it is whatever the market will bear.

 

yeah but i think 500 is a little steep and showing there has been no real gains from doing this

 

I swear people do **** all bass acwards...

cc306 w/o headers or tuning?? WHY???



Finish your bolt-ons.. THEN go inside the motor. That's what I did, worked out great for me.

 

Ah i figured since there was only 1 casting number, they would all have the lt4 on them too. Mine did


Also the lt4 manifolds NEED to be ported. They are no where close to matching up to the lt4 heads.

500 bucks, assuming it is ported well, isnt a jip IMO. 200 for intake + 300 port isnt bad.

 

i paid 224 for mine, brand new. bout 100 for the P&P and bumping to 58mm. mine does not say lt4 on the bottom. that may be something GM did on the lt4 cars that got them, but new ones ordered from gm do not have that. also mine has a part number of 12550531.