Description
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This listing is for two (2) exhaust manifolds and two (2) 4″ 7° risers (elbows) for Mercruiser MODEL 330-370, V8 (B.B.), GM 454/502 CID (1981 up to 0M SN#’s) with raw/fresh water cooling systems without spacers. P/N (2) 51240 (GL51240)+(2) 51140 (GL51140); equivalent to the contents in GLM part number 58242 (GL58242.) **NOT FOR DRY JOINT EXHAUST** THE 4″ RISERS FIT 1981-early 2000’s. Note:Ordering this item will require a signature confirmation upon delivery. Please ship to an address where a signature can be obtained from UPS.
Vehicle information
Available fitment details
Listing compatibility notes
- ) **NOT FOR DRY JOINT EXHAUST** THE 4" RISERS FIT 1981-early 2000's.
Fitment data is provided as a buying aid. Verify the listing against your vehicle and existing part before ordering.
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Check exactly what this manifolds listing includes before checkout.
Package contents
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Before you buy
- Verify the referenced part number: 58242.
- Compare the listing title, photos, package contents, and specifications with the part being replaced.
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Customer feedback
Ratings and written reviews
3.6 / 5
25 source ratings
Source: Amazon. Imported marketplace feedback is shown for product research and is not a review of a purchase made on this website.
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Customer –
Fit perfect !!!
Edward Kluska –
Fit as expected very pleased
Gambrelle –
Item was exactly as described. Fit perfectly in our 80s model Chris-Craft. Fast shipping
Verified buyer –
Worked well and very complete kit, thanks!
David arboleda –
One riser seal melted. It came defective. It had to be replaced by quicksilver. I had to hire mechanic again
Dan VanDerWoude –
Absolute garbage installed these on my boat in March 2021 totally rotted out and destroyed my engine by June 2023. Do yourself a favor and buy OEM mercrusier parts not this junk. One star because I couldn’t do 0 stars
chris m. –
These are for one side of the motor just look at the pictures,you have to put different fittings and hoses on to make it work
W_E_Coyote –
These are great quality but they should come with bolts. They require a different length bolt than the factory manifolds, which is a difficult surprise when you are trying to mount them because they weigh a ton.