Intake manifolds on an Mercruiser 898 and a Mercruiser 228R

[jimrockireland]

I am swapping parts from my cracked block 1983 Mercruiser 305/5L MCM228 (Serial# 6275628) to an 898 Mercruiser 305/5l (serial # 5403332). The 898 has a 2 barrel carb and I was thinking of replacing it with the MCM228 4 barrel carb (with Thunderbolt ignition). It appears though, that this also requires swapping the intake manifolds. Suddenly it doesn't seem like a good idea anymore. Is there anyway around not having to swap intake manifolds when swapping the 2 barrel for a 4 barrel?

 

[matt167]

Re: Intake manifolds on an Mercruiser 898 and a Mercruiser 228R

nothing is complicated about switching a SBC intake. Pull distributor, mark rotor position, pull the bolts an remove intake. Don't bother with the end gaskets on the intake, just use black RTV

 

[alldodge]

Re: Intake manifolds on an Mercruiser 898 and a Mercruiser 228R

I am swapping parts from my cracked block 1983 Mercruiser 305/5L MCM228 (Serial# 6275628) to an 898 Mercruiser 305/5l (serial # 5403332). The 898 has a 2 barrel carb and I was thinking of replacing it with the MCM228 4 barrel carb (with Thunderbolt ignition). It appears though, that this also requires swapping the intake manifolds. Suddenly it doesn't seem like a good idea anymore. Is there anyway around not having to swap intake manifolds when swapping the 2 barrel for a 4 barrel?

In the old days they made adapters for us young'ens (at the time, now old guy) to be able to put a 4brl on top of a 2brl intake. We thought that was groovy. They really didn'twork because the air flow opening needed to operate the 4brl wasn't there. Just burned more gas and on a boat probably burn the engine a lot sooner. They may still make those adapters but I wouldn't recommend it.

Your just talking an intake gasket, so just swap the intakes, they will fit.

 

[jimrockireland]

Re: Intake manifolds on an Mercruiser 898 and a Mercruiser 228R

Thanks for the advice. I thought I would have to replace head gaskets.