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468 build

Old 05-20-2020, 02:04 PM
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525EFI cam is Getting up their in duration. 236 at .050, therefore in a 454 youíll want near 10:1 compression.

Also, the LSA is a little wide at 114. 112 would fare better power and rpm band wise.
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picca00 (05-21-2020)
Old 05-20-2020, 08:39 PM
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Originally Posted by picca00 View Post
Rookie are you running dry exhaust? Whatís that max lift you can get away with staying with reasonable compression?
Stainless Marine dry to the tip will be used with the above mentioned build.
My other built 454's currently have 235į/241į 0.684"/0.665" (rocker 1.8,1.75) LSA 113, 9.0:1 with custom Dart Pro1 heads and CMI E-Top that are dry 3/4 to the transom. These use to have 252į/264į 0.668"/0.668" @ 9.7:1 with the dry to the tip Stainless Marine exhaust.
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Old 05-21-2020, 12:30 PM
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Originally Posted by picca00 View Post
what heads did you use and what’s the approx hp?
9.5:1 454 GEN VI Using Merlin 1043-C heads. 310CC, 119cc, 2.300 Intakes, 1,88 Exhaust Heavy but in marine world I was building for longevity with Matching Merlin intake with Brass Water Jackets. 800 Holley from HP500, 168731 Crane Cam 226/236 .587 / .610 112*
I'm guessing around 500hp ish. I run 93 in all my engines so I tend to lean towards higher compression then most. Contemplating on taking it to the dyno just to proove itslef. I'm may be selling this engine soon. If I did run this I have Stellings Full Dry Exhaust to Tip exhaust.

Originally Posted by SB View Post
The 731 is a tad smaller than the 500EFI cam. (226 vs 230 int duration at .050”)
Still a good choice for many 454/502 builds.
Agreed, I built this engine with possible intent of selling so didn't want to go too big. For reliability I like the Smaller 500EFI or 731 for 454's and 741 or 525EFI's for 502+ Ci.

Last edited by KRAUSMOTORSPORTS; 05-21-2020 at 12:32 PM.
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Old 05-21-2020, 07:23 PM
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Ok thanks guys, I figured the 112 would be better, but in general if I go with the bigger 525 cam, I will just need a little more compression and spin more rpms? I only run 93 octane so 9.5-9.7 compression should be ok and possibly still make the power just under 6k?
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Old 05-22-2020, 06:45 AM
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Originally Posted by picca00 View Post
Ok thanks guys, I figured the 112 would be better, but in general if I go with the bigger 525 cam, I will just need a little more compression and spin more rpms? I only run 93 octane so 9.5-9.7 compression should be ok and possibly still make the power just under 6k?
What intake?
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Old 05-22-2020, 07:13 PM
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High rise intake most likely, I donít know if a air gap would be enough...
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Old 05-23-2020, 06:46 AM
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Originally Posted by picca00 View Post
High rise intake most likely, I donít know if a air gap would be enough...
The air gap is probably the best intake up 600ish. Which you may be flirting with depending on how much cam you use.

What boat is those?
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Old 05-23-2020, 01:40 PM
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Originally Posted by hogie roll View Post
The air gap is probably the best intake up 600ish. Which you may be flirting with depending on how much cam you use.

What boat is those?
A single plane like Team G, Dart, Merline would perform better up top. But a dual plane would be better controlled at the docs IMO. I love the air gap. Just wished they had a marine version for those of us running raw water. Even though we have had engines with standard Intakes last almost 20 years! We're in brackish waters.
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Old 05-23-2020, 04:41 PM
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Originally Posted by hogie roll View Post
The air gap is probably the best intake up 600ish. Which you may be flirting with depending on how much cam you use.

What boat is those?
Iím really leaning towards the 525efi cam if I canít find something on a 112... itís for 1979 glastron Carlson cv23 that Iím restoring... floor stringers, transom all done, onto the test rigging phase and a lot of custom work to get want I want...
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Old 05-24-2020, 07:24 PM
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So any more opinions on me putting the 525 efi cam in my 468 build? I thinks thatís my pick...
thanks for the input
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