cyrus_the_great said:
i am not asking about brands or better flow or comparing gbody or fbody fitment ... i am asking if i have a gbody with v8 oldsmobile and going to swap the engine to v8 pontiac ... what will be different on pontiac headers in compare to oldsmobile one what i have . only the engine side flange and its bolt locations?
can i replace the flanges only to mount it on pontiac engine?
Ok, if you switch to the Pontiac, you will have to get pontiac headers. Trying to cross fit in any way will cost you time, money and engine power. And you still wont get the advantage of headers designed for the engine. A example is some Pontiac Fbody headers fit a Gbody but Olds Fbody headers will not work well at all. They are that different even down to the way they work.
That's why some are called "Tuned headers". They increase the the engines power efficiently. Also that's why a Pontiac and Olds sound different from similar exhaust setups.
Can you make it fit? Yes. But it won't work like a true made for Pontiac header, thus killing some of the power.
Thanks for clarifying your question.
I hope this answers it better.
T