Why is the Gen 7 496 such a bad platform to build
10-27-2015, 02:45 PM
#101
Gold Member
Gold Member
You scare the chit out of me with those pictures every time you post them. 
I think I read from one of your posts that mess was caused by a dropped valve, correct? I am waiting to do a whole bottom end next season. I want to put the stroker rotating assembly in it and go with the stronger crank, rods, and pistons.
The rest of the parts came in this morning. I put the cam in and checked it with the degree wheel. It is off by about 1-1.5 degrees using the stock chain and gears. There is a little slop in there, not a whole lot but enough that it is probably throwing things off a bit. New chains will be going in when I do the bottom end.
I think I read from one of your posts that mess was caused by a dropped valve, correct? I am waiting to do a whole bottom end next season. I want to put the stroker rotating assembly in it and go with the stronger crank, rods, and pistons. The rest of the parts came in this morning. I put the cam in and checked it with the degree wheel. It is off by about 1-1.5 degrees using the stock chain and gears. There is a little slop in there, not a whole lot but enough that it is probably throwing things off a bit. New chains will be going in when I do the bottom end.
10-27-2015, 04:10 PM
#102
Can you give me a link to one of the 200.00 dollar 8.1 blocks .I need one and I haven't seen a price anywhere close to that .Not kidding .I will pay you a finders fee for a good one..Don't need a non useable one
10-28-2015, 07:16 AM
#106
Registered
iTrader: (6)
Just a couple of personal experiences. I fell for the ridiculous hp gain claims of the CMI headers so I paid nearly $5,000 for a set for my 496 HO Donzi 22 Classic. I saw absolutely ZERO gain in top end or mid-range. $5,000 down the toilet. My top speed was still 73. After running my options by a LOT of people I PAID $20,000 for a low hour 525 EFI. Boat runs 83-85 with a best recorded speed of 85.8 and I burn 87 octane fuel. A friend did the Raylar 525 kit in the same model boat and could not hit 80. He also still had all of the inferior pistons, rods, crank etc. That is why I stated early in this thread that Matt should have gone with the 525s and rebuilt them or switch to 502s. He took the plunge and committed to the 496. Now if everything is swapped out in this engine and it is built to proper tolerances then it should perform well. It will for sure perform well with a Pro-Charger and all new rotating assembly. I am not a fan of the 496 after talking about it with a lot of engine builders and other people in the know. It can probably be made to work reliably if everything is done and I do wish Matt the best. I am eagerly following this thread. Matt, I am not beating you up for going with the 496 and I hope it works out well. Ray would always get mad at me when I'd advise people to lose the 496 and go with a 502 based engine. He tried but he wasn't real good at marketing.
Is that Raylar 525 intake manifold pictured in the article the one that is no longer made?
Is that Raylar 525 intake manifold pictured in the article the one that is no longer made?
10-28-2015, 07:39 AM
#108
10-28-2015, 08:28 AM
#109
Registered
iTrader: (1)
3 Childhood - as you probably know, but worth mentioning to people that may not, the 525 Merc 502 actually dyno's closer to 560 or so. So, hp rating vs hp rating, the 502 based 525 will beat that 496 525 (speed wise) because of that alone.
10-28-2015, 08:45 AM
#110
Gold Member
Gold Member
A lot of engine builders in the know probably told Excess Energy he was crazy to use FORD but he did.
http://www.offshoreonly.com/forums/v...-upgrades.html
Everybody told Precision that small blocks wouldnt work and he did it anyway too.
http://www.offshoreonly.com/forums/f...esnt-work.html
FWIW it cost me around $26,000 to build both my 600's that have been reliable for 200+ hours.
Sometimes its fun to break away from normal.
