blk89lx

just picked up a 347 and im in the market for longtubes my question in should i go with 1 3/4 or 1 5/8?

code3GT

What heads and intake?

blk89lx

gt40 heads gt40 intake and a b cam. i plan up upgrading later on.

code3GT

Whatcha gonna upgrade to?

blk89lx

a set of better flowing heads like afr's or canfields and a custom ground cam

code3GT

Well, it really depends on the specs of the motor, heads, intake and cam. With the basic info you have posted..."I" think you'll be fine with 1 5/8.

blk89lx

i was thinking the same but would they also work well if i decide to upgrade down the road?

blk89lx

cermaic is deff the best way to go also right?

code3GT

You would have to upgrade QUITE ABIT to justify the 1 3/4. As far as coatings...depends on how much driving you will be doing with it. I have run MAC's with their HTS coating (I think the HTS is overrated, wouldn't spend the extra $$ for it again). I have also run BBK chrome LT's on my 92 coupe. They were very nice and didn't discolor as much as I thought they would. The biggest problem with them is that they got HOT and stayed HOT for quite awhile.

I am now running ceramic coated LT's (they are coated on the outside as well as the inside). They are quite expensive, but will last a long time and look good for just as long. The thing, I really like about them is...they cool off quickly, allowing me to change plugs in between racing rounds without wearing my "Mechanix" gloves or burning the hell out of my hands.

code3GT

BTW, I have also run stainless headers with no coatings. As a matter of fact, my wife has stainless LT's on her 06 GT. They look great, but they (like chrome) get hot and stay hot for awhile.