Description
Comparison points and tradeoffs
When comparing Mercruiser 330 340 MIE Chevy Marine 454 7.4 7.4L GLM Exhaust Manifolds+4′ Risers with other Manifolds options, use this source-backed detail as the primary discriminator: Category: Replacement Parts / Exhaust & Emissions / Manifold & Parts / Manifolds.
Use this second fact to evaluate the tradeoff: Referenced part number: 58242. A third point to compare across alternatives is: Mercruiser MODEL 330-370, V8 (B.B.), GM 454/502 CID (1981 up to 0M SN#’s).
Alternative-selection boundary
Choose an alternative when its stated identifiers, application, package, or specifications better match the requirement; no unverified competitor claim is introduced here.
Complete source-backed product details
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.
Source product highlights
- NOT FOR DRY JOINT MANIFOLDS SEE IMAGES
- Mercruiser MODEL 330-370, V8 (B.B.), GM 454/502 CID (1981 up to 0M SN#’s)
- (2) exhaust manifolds and two (2) 4″ 7° risers
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.