Camshaft Selection/Engine Setup

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03-07-2016 | 11:54 AM

#11

HaxbySpeed

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Joined: Mar 2008

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From: Vancouver BC

Quote:

Originally Posted by distantthunder

Would that work with my existing rockers? This is a picture taken during teardown

You can use your non adjustable rocker set up, but may have to get different length pushrods if the base circle of the cam is different. If you want to swap to an adjustable setup, ARP, and Crane make a conversion kit. Those heads have a 3/8 boss for the rocker stud. I used the cam you listed in a 454 jet boat application about 15 years ago with edelbrock marine heads and just over 8.5 compression. It made 510hp, one of the comp lifters died at about 700 hours but luckily didn't hurt much. It ran factory merc manifolds for about a year, and then upgraded to Kodiak, EMI type exhaust. No reversion issues, always ran strong.

03-07-2016 | 11:54 AM

#12

distantthunder

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From: Denton, MD

Quote:

Originally Posted by No Coast

From that picture you have a hydraulic flat tappet camshaft set-up. You will need camshaft, roller lifters, timing chain set, dog bones, retainer plate w/ bolts, push rods, valve springs, retainers and keepers. You will have to replace the rocker arms also, I like the Comp Cams stamped steel roller arms for budget builds, but a full roller rocker is more conventional. May need rocker studs as well, can't tell if you have adjustable valve train. It's definitely worth the money. If you have a heavy boat I would take about six degrees of duration @ .050 away from the cam selection for more low end torque. What size is your oil cooler?

It's a GEN VI. The oil cooler appears to be the stock one mounted low on the portside about the size of a beer can.

03-07-2016 | 11:56 AM

#13

distantthunder

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From: Denton, MD

Quote:

Originally Posted by HaxbySpeed

Thanks HaxbySpeed, this all started because I needed to replace my engine coupling just for good measure as my engine walked towards the end of last year. Now shes torn down and at the machine shop.

03-07-2016 | 01:54 PM

#14

Boatally Insane

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Joined: Nov 2004

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From: Lago Vista TX

I had that cam in my Corsa in a bored over 427...

ran GREAT !

4.310" bore x 3.760" stroke.

TRW LF2300 pistons 16.8cc dome

781 heads with some mild porting.

2.06" intake 1.72" exhaust valves

9.0:1 - 9.3:1 Compression ratio depending on chamber size.. (not sure)

Weiand Team G Intake with a 9022 Holley 800 Carb.

Eddie Marine EMI Thunder exhaust..

https://www.youtube.com/watch?v=2UX0wQBukI8

03-07-2016 | 01:56 PM

#15

distantthunder

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From: Denton, MD

Quote:

Originally Posted by Boatally Insane

That sounds amazing, come on Spring!

03-07-2016 | 07:54 PM

#16

No Coast

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My bad, I couldn't see the dog bones till they were pointed out. It is a roller set-up, disregard everything I said except the rockers and increase your oil cooler size.

03-07-2016 | 08:20 PM

#17

horsepower1

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Joined: Oct 2015

Posts: 277

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KB/Icon makes a super nice forged piston that has a small 18cc closed chamber dome. With a .030 over 454 and 119cc chamber they're right at 9.3:1. This is a super durable piston with some real nice features and not that expensive. Part number IC779.