GLM Manifolds are Superior in the Aftermarket Marine Parts Industry.
Designed to Increase Performance, Reduce Back Pressure
and Add More Horsepower to Your Engine!
Our fully tuned design guides exhaust gases directly to riser without turbulence and back pressure. This increases
the 
engines performance up to 10%. In the meantime, an additional 40% water cooling area will decrease the entire manifold
body temperature significantly
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 (1987 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 1987-up
This
manifold kit contains (2) exhaust manifolds, (2) 4" risers (elbows),
and FULL manufacturer's 3-year warranty. This manifold set can
improve the performance of your stock engine and improve fuel
efficiency at the same time. Kit contents are listed below:
- (2) 51140 - Exhaust Elbows - OEM #807988A2
- (2) 51240 - Exhaust Manifolds - OEM #807078A6
- (2) 30240 - Elbow Gaskets - OEM #27-863724
- (2) 33760 - Manifold Gaskets - OEM #27-46820
- (8) 22381 - Screws - OEM #10-43749
- (2) 13990 - Hose Fittings w/drain plug kit
We are adding new part numbers daily. If you
don't see what you need, please call or eMail us. We will be glad to help in
any way!
800-756-1114 or
btoc@internalengineparts.com
THANK YOU for allowing us
the opportunity to earn your business!
