Roller rocker debate
#11
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iTrader: (7)
1.8's are a tool for me for the most part although have run them in the past. In some cases build depending they work well and worthy. Others not and gain not worthy. Never had valvetrain issues with them. It like 14 apache mentioned in your application gains would more than likely be minimal. I'd seriously consider 741 cam in your build.
#12
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Thread Starter
1.8's are a tool for me for the most part although have run them in the past. In some cases build depending they work well and worthy. Others not and gain not worthy. Never had valvetrain issues with them. It like 14 apache mentioned in your application gains would more than likely be minimal. I'd seriously consider 741 cam in your build.
#13
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iTrader: (3)
You have a 4.25 stroke engine. 8.6:1 is low, but pretty much same thing mercury used on the 525efi, 502 mags,, etc. Those were 4 inch stroke. A 4.25 stroke will require more camshaft.
I personally think that cam is going to be small in that build. Mercs 525efi, had a 236/244 cam with fairly low static. They run great. If you wanna make some power, youll need a cam that doesnt die at 5000-5200rpm.
I bought the comp ultra pro mag XD rockers last winter. So far so good. They look very beefy compared to the old cranes I had. I too ran cranes for years, had good luck, only 1 broke a trunnion. Then again, years back, we were running alot less spring psi, lot less rpm, milder cams, and so on.
I personally think that cam is going to be small in that build. Mercs 525efi, had a 236/244 cam with fairly low static. They run great. If you wanna make some power, youll need a cam that doesnt die at 5000-5200rpm.
I bought the comp ultra pro mag XD rockers last winter. So far so good. They look very beefy compared to the old cranes I had. I too ran cranes for years, had good luck, only 1 broke a trunnion. Then again, years back, we were running alot less spring psi, lot less rpm, milder cams, and so on.
#14
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Thread Starter
You have a 4.25 stroke engine. 8.6:1 is low, but pretty much same thing mercury used on the 525efi, 502 mags,, etc. Those were 4 inch stroke. A 4.25 stroke will require more camshaft.
I personally think that cam is going to be small in that build. Mercs 525efi, had a 236/244 cam with fairly low static. They run great. If you wanna make some power, youll need a cam that doesnt die at 5000-5200rpm.
I bought the comp ultra pro mag XD rockers last winter. So far so good. They look very beefy compared to the old cranes I had. I too ran cranes for years, had good luck, only 1 broke a trunnion. Then again, years back, we were running alot less spring psi, lot less rpm, milder cams, and so on.
I personally think that cam is going to be small in that build. Mercs 525efi, had a 236/244 cam with fairly low static. They run great. If you wanna make some power, youll need a cam that doesnt die at 5000-5200rpm.
I bought the comp ultra pro mag XD rockers last winter. So far so good. They look very beefy compared to the old cranes I had. I too ran cranes for years, had good luck, only 1 broke a trunnion. Then again, years back, we were running alot less spring psi, lot less rpm, milder cams, and so on.
#19
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Thread Starter
Flat tops. 020 in hole. 3cc reliefs 119 heads. Gonna run steel shim gasket to keep compression up and quench in check.
#20
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