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Your cart is empty.For Post-1986 Mercruiser GM V8 -4 inch elbow -3 inch spacer In the V8 GM Small Block, GLM's fully tuned design guides exhaust gases directly to the riser without turbulance and back pressure. This increases the engine's performance up to 10%. These GLM manifolds also feature an additional 40% increase in water cooling area that decreases the manifold's overall body temperature significantly. In GLM's Mercruiser replacement 4 inch riser, there are two additional water jackets. This allows a higher volume of water to flow through the riser, keeping the engine cooler. *All manifolds and risers are powdercoated black for maximum corrosion protection* **Cast Iron manifolds and risers come with a 3 year warranty**
Paul c
Reviewed in the United States on July 18, 2024
Perfect fit and exactly what I needed price was reasonable
Daniel baker
Reviewed in the United States on March 28, 2024
Did not receive all the parts. Missing both 4 inch spacers.
Customer
Reviewed in the United States on January 6, 2024
Lost two engines to these poorly designed manifolds. Only buy original
Malayo
Reviewed in the United States on July 20, 2023
Good
Richard
Reviewed in the United States on May 18, 2020
Manifolds, Runners and Risers for a 5.7 L Mercruiser. Products were good however they supplied the wrong manifold bolts. (Too Long) Two of the gaskets were damaged, one needing to be replaced and a couple of the manifold blank plugs weren't tightened down. Check them.
Eric Smith
Reviewed in the United States on March 4, 2019
One of the manifolds in the kit Threads were oversized for the riser studs to where the studs would thread in by hand but pulled out when torqued to 25Ft Lbs.
Deborah Maureen Frazier
Reviewed in the United States on July 30, 2018
This was a good value and came in relatively quickly so that I could get my boat up and running. I installed this on a Mercruiser 5.7 motor. I would buy this again. :)
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