Generation III External Engine - Will LS7 ex. manifolds fit ls1/lq4

Will these manifolds fit my 2003 Lq4. I'm putting it in a 1937 Chevy and I need some block huggers, but the stock ls7 manifolds are much cheaper to buy.

Any other reasons not to use the ls7 exhaust manifolds. I've tried searching everything I could find about them to get info. Does anyone have a measurement to how far they stick out from the block?

If not that, how far do the GTO exhaust manifolds stick out from the block?

http://ls1tech.com/forums/attachments/parts-classifieds/257442d1286405686-truck-exhaust-manifolds-ls7-manifolds-ls3-manifolds-cts-v-ls6-manifolds-6-1-hemi-dsc_0343.jpg

Thanks,
Brandon

They will bolt on the engine not sure or the measurements I usually use f body manifold myself when I do swaps

Not sure if the ls7 manifolds will work, but ls2 and ls3 manifolds from a vette are the same design roughly and will for sure fit.

Ok, thanks for the replies, guys.

If you have some ls7 manifolds available I would try them, they flow amazingly. You would need the beginning of the rest of the exhaust though to mount to their oval exit.

I don't actually have any yet and I don't have any manifolds to test before I buy so I'm trying to make sure I buy the right ones the first time. (i have the old truck manifolds that I know won't fit).

There's a guy on a Vette forum that says he has some exhaust manifolds for a 99 C5. I've been measuring and it's just really hard to tell without holding them up to the car.

Thanks,
Brandon