Exhaust manifold problem cyclone 400 engine mercruiser

[erick11s]

Hi, i rebuilt a 400 cyclone engine year 1985t o swich my old 330 hp 454 five generation year 1993, my question is, can i use the same exhaust manifolds of my 330 engine in my 400 cyclone. The original cyclone 400 are different are long exhaust and they are not more in the market, some friends tell me about a problem with WATER REVERSION if i use my standart exhaust of my old 454......please help

Thanks in advance

 

[series60]

Re: Exhaust manifold problem cyclone 400 engine mercruiser

Hi, i rebuilt a 400 cyclone engine year 1985t o swich my old 330 hp 454 five generation year 1993, my question is, can i use the same exhaust manifolds of my 330 engine in my 400 cyclone. The original cyclone 400 are different are long exhaust and they are not more in the market, some friends tell me about a problem with WATER REVERSION if i use my standart exhaust of my old 454......please help

Thanks in advance

Are you installing a sbc400 where the bbc454 was? Then the manifolds won't fit. SBC400 are not the best choice for marine use. The steam holes can become plugged with crud from saltwater use.

 

[Bondo]

Re: Exhaust manifold problem cyclone 400 engine mercruiser

Hi, i rebuilt a 400 cyclone engine year 1985t o swich my old 330 hp 454 five generation year 1993, my question is, can i use the same exhaust manifolds of my 330 engine in my 400 cyclone. The original cyclone 400 are different are long exhaust and they are not more in the market, some friends tell me about a problem with WATER REVERSION if i use my standart exhaust of my old 454......please help

Thanks in advance

Ayuh,.... Just what is a "400 cyclone engine",..??..??

Is it a 400 hp BBC,..??
or,..
It's it a 400 cid SBC,..??
or,...
Is it something else all together,..??

If it's a 400 hp BBC,... Yes the exhaust bolt pattern is the same....
or,....
If it's a 400 cid SBC,... Nope, completely different, 'n yer outa luck....

 

[Stevens520]

Re: Exhaust manifold problem cyclone 400 engine mercruiser

Ayuh,.... Just what is a "400 cyclone engine",..??..??

Is it a 400 hp BBC,..??
or,..
It's it a 400 cid SBC,..??
or,...
Is it something else all together,..??

If it's a 400 hp BBC,... Yes the exhaust bolt pattern is the same....
or,....
If it's a 400 cid SBC,... Nope, completely different, 'n yer outa luck....

It appears to be a 454 according to the merc manual
http://boatinfo.no/lib/mercruiser/manuals/mercruiser3.html#/38

 

[picklenjim]

Re: Exhaust manifold problem cyclone 400 engine mercruiser

400 cyclone was a production performance 454 made in the 80's. Forged bottom end, rectangular port heads,aluminum dual plane. What needs to be known is the cam specs to determine if there will be reversion problems if using the stock 330 exhaust manifolds. Especially the LSA (lobe seperation angle).

FYI Merc made the Cyclone Series of engines in the 80's. 400-420-440-460

 

[Stevens520]

Re: Exhaust manifold problem cyclone 400 engine mercruiser

If it helps; after a bit of searching out of curiosity, Barr Marine does make the manifolds. Parts #'s MC-1-47735 and MC-1-47736 for the manifolds and MC-20-76668 for the risers.
http://barrmarine.net/products/?page=40

 

[erick11s]

Re: Exhaust manifold problem cyclone 400 engine mercruiser

Hi, sorry for my late reply......About the LSA where i can find this information, and in another way ....the engine 502 I think use the same manifols that of my old 330HP 454 (7,4) and is 415 hp ?????

 

[erick11s]

Re: Exhaust manifold problem cyclone 400 engine mercruiser

If it helps; after a bit of searching out of curiosity, Barr Marine does make the manifolds. Parts #'s MC-1-47735 and MC-1-47736 for the manifolds and MC-20-76668 for the risers.
Products | Barr Marine by EDM

thanks I called and the price for each PART it is USD 379 X 4 ( 2 RISER-2 EXHAUST MANIFOLD= 1.516 IT IS TOO EXPENSIVE)