Indmar intake manifold

[99responselx]

Does anybody have a part number or info on a replacement intake manifold for a 1999 indmar monsoon mpi. Any info or help would be appreciated 

[justgary]

Call Indmar and ask.  They tend to be pretty helpful, from what I hear.

[99responselx]

Already did that they don't know

[justgary]

12 minutes ago, 99responselx said:

Already did that they don't know

Just for kicks, I'll ask what happened to your original one?  They seem pretty durable.

Welcome to the crew, by the way!

[99responselx]

Previous owner neglect. Ran in saltwater and did not flush. Has a hole in the back of the intake where the water jacket is in the cylinder head

[justgary]

2 minutes ago, 99responselx said:

Previous owner neglect. Ran in saltwater and did not flush. Has a hole in the back of the intake where the water jacket is in the cylinder head

Uggggh.  I'm really glad I converted mine to closed cooling.  I still have that issue with exhaust manifolds, so I'm looking for all stainless ones that won't break the bank.

I don't know about the bolt pattern, but you might find an aluminum one for sale... https://www.summitracing.com/parts/hly-300-260/make/chevrolet

Also, it may be worth visiting your dealer to see if they have one on their junk pile.  Some dealers tend to keep things like that lying around for quite a while.

[99responselx]

I found one that is identical except it is for a 4 bolt throttle body and mine is a 3 bolt. Not sure if they make a adapter or not

[Voloare]

I recently replaced the block on my 2002 malibu 5.7l indmar engine.  We used the original manifold only to find a leak between the manifold and block which made the oil milky.  There is a PFI intake on the market that will work with the 3 bolt throttle body and is sold by a few folks online.  It is Indmar 532203MODE.  This intake is made for a 4 bolt throttle body, but there are adapter plates readily available which can convert the between the 3 bolt throttle body and 4 bolt intake which allows you to use the existing throttle body, fuel rails and mechanical throttle cable.  Be very careful to buy the adapter plate in the correct orientation.  There are plates for 3 bolt throttle bodies and 4 bolt intakes and 3 bolt intakes and 4 bolt throttle bodies that look almost identical, you need the plate with 4 recessed holes so the throttle body can sit flush on the plate after it is bolted to the throttle body.  The links for the products I used are below:

https://www.holley.com/products/engine/intake_manifolds/installation_parts_and_accessories/parts/860026?utm_term=&utm_campaign=Google+Shopping+-+Sniper+-+Non-Brand&utm_source=google&utm_medium=cpc&hsa_acc=7848552874&hsa_cam=1753554676&hsa_grp=70752454033&hsa_ad=344061769642&hsa_src=g&hsa_tgt=pla-321580032449&hsa_kw=&hsa_mt=&hsa_net=adwords&hsa_ver=3&gad_source=1&gclid=CjwKCAjwoPOwBhAeEiwAJuXRh0q49iyQCnmKTdY4o__wtMUXv3Bz1VCXmLe_h2dQ44x_K7uMiNYBVBoC12gQAvD_BwE

https://www.michiganmotorz.com/5-7l-e-coat-mpi-vortec-intake-manifold-indmar-1996-current

Edited 2 hours ago by Voloare

[Steve B.]

This thread is a couple years old, but that is a great find. This may save a whole bunch of folks with similar series engines a lot of grief and money.