Quick question, what size outlets are on the HO/L69 manifolds? iv got an extra set of manifolds out of a camaro and he said it was "fast" so id ont know if they are actualy L69's or just regular LG4's.

 

i think the crummy stock LG4 manifolds are 1.75 inch outlet. i believe that the HO manifolds and TPI manifolds have 2.25 outlets. i have read that stock L69 and TPI manifolds flow decent for iron manifolds. a few years ago in GM high tech performance, there was a red 89 iroc wiht an ati procharger goin 11s on stock manifolds. regardless manifolds are not the hot setup, ask almost anyone on here with headers if they like them and you will get a resounding yes. i have the edelbrock TES headers and i got a great gain from them, i have no numbers to back it up, but i defenitely felt a difference.

 

well im swapping motors and if i have some L69 manifolds ill put those on because i want to get my motor in but i cant get headers just quite yet, i put a post up about headman headers 68470 and y pipe 17470? if they are any good or not.

 

This is weird, one of the manifolds(pass side) has 2.25 outlet and the other one(driver) has 1.75 in is this normal? they are camaro manifolds both of them. but one has a larger outlet than the other. these were off of a parts engine i bought from a camaro and it has "been rebuilt" at one time. but it had a different intake, roller tip rockers carter AFB carb. ect. so i dont know if this is some kind of frankenstien setup or what. but here's a pic of them.

 

thats wired, i am pretty sure the manifolds on my camaro were the same outlet size. looks like someone goofed on that engine. but remember that both large and small manifolds look almost identical from the outside so it woudl be easy to goof up and not realize it.

 

i was happy to see that it was large diameter exhaust on it, but i noticed the other and i was like....DOH! cause i was going to run manifolds on my car for about a week when i put the motor in so i can get money built up for the headers. but one high flow one, and one crappy flowing one....i dont know, its kinda funny. the air tube holes either have bolts in them or plugs or welded. its very odd. looks like someone did a cheap rebuild trying to get the car fast.

 

Also maybe i can run the numbers on the Manifold to see if its actualy a L69 manifold.