Re: GLM Manifold Blues
Check out this guy's story from another forum.
Misfiring thru carburator 220HP.5 liter
06/14/10 at 22:08:54
Last Octember went fishing in the gulf, manifolds filled port engine with salt water(hydra locked), we thought the starter was bad. By the time we were back in Memphis port engine was locked up, replaced engine. Starbord engine ran fine, but it injested a very small amountof salt water. Started
getting ready for spring fishing, now we have a back firing through the carburator 2000 3500RPM. After inspection, we pulled the heads had the values worked. put back on, with all new gaskets, set everything to specs per chevy and mercrusier. Backfired tru the carburator again. Pulled the haeds again, lapped the heads and values to a mirrow finsh, filled each chamber with gas all are holding no leaks.. Swapped heads. seams like our problem is with #8. Put engine back together. Backfired thru the carb., Checked pulg wires, Swapedstributor caps. Swapped modual, Swapped distributors still back fires thru Carb? This leaves Value springs, rockers and camshaft. It is a roller camshaft. I have just about pulled what little hair I have left our where do I go now???????????
Checked compression 150PSI cold, Shows 125 hot. I forgot to mention last year the water pump went out engine got pretty hot. Ran fine for 3 days after I replaced the water pump.
(The fix)
Re: Misfiring thru carburator 220HP.5 liter
Reply #2 - 06/15/10 at 23:37:55 FOUND THE PROBLEM!!!!!!!!!!!!!
Pulled the new exhaust manifold, #8 is solid nothing can get thru. Cranked it without the manifold, ran great. Now I have a PROBLEM WITH
INTERNET SUPPLIER. GLM. after this post I am calling them.