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1989 mod. AQ271C - Releasing it's power potensial, what do I do?

V

Vegard

New member
Hello expert panel :)

I want some more power in my AQ271C without swapping the cylinder heads.

Thinking about a Comp Cam Xtreme Marine 212/218 Hydraulic Roller, Edelbroch Performer RPM Q-JET Marine Intake Manifold and an Edelbrock 1409 Marine Series 600 CFM electric choke carburetor. The distributor has already been swapped with one with electronic ignition, not sure which type.


My questions:

The flow of the stock cylinder heads is limited, what's the maximum horsepower they can support?

Just to be sure, since it's a 1989 model, it has hydraulic roller cam, hasn't it?

Do I need to swap the stock lifters, pushrods and rockers or are the stock parts ok?

Is this a good setup or are there better ways to go?

What power gain can I expect?


Thank's!

Vegard
 
Vegard said:
Hello expert panel :)

I want some more power in my AQ271C without swapping the cylinder heads.

Thinking about a Comp Cam Xtreme Marine 212/218 Hydraulic Roller, Edelbroch Performer RPM Q-JET Marine Intake Manifold and an Edelbrock 1409 Marine Series 600 CFM electric choke carburetor. The distributor has already been swapped with one with electronic ignition, not sure which type.


My questions:

The flow of the stock cylinder heads is limited, what's the maximum horsepower they can support?

Just to be sure, since it's a 1989 model, it has hydraulic roller cam, hasn't it?

Do I need to swap the stock lifters, pushrods and rockers or are the stock parts ok?

Is this a good setup or are there better ways to go?

What power gain can I expect?


Thank's!

Vegard
Click to expand...
i would go with the standard edlebrock marine performer vs the rpm as the power band is lower and more matched to a relatively stock build.

why are you opposed to swapping head upgrading to vortecs is worth 30-40 hp
 
Vegard said:
Thank's for answer :)

You mean this cam shaft? Part# 3702 https://www.edelbrock.com/performer-plus-camshaft-kit-for-1976-95-small-block-chevrolet-3702.html

Not opposed, just want to keep the budget as low as possible. If the costs increases I will rather go for a stroker build. Dreaming of a 427 built on Dart block and heads.
Click to expand...
No the intake manifold, you mentioned using this intake -

Edelbroch Performer RPM Q-JET Marine Intake Manifold- https://www.summitracing.com/parts/edl-2506
the perfomrer rpm has a rpm range of 1500-6500 rpm

vs the standard (aka non rpm) performer https://www.michiganmotorz.com/edelbrock-marine-sbc-v8-performer-intake-manifold-1987-95
performer has an rpm range of idle -5500 whihc better matches a marine engine that is essentially except for cam and intake stock .

You should look for stock iron vortecs used or rebuilt which I think are cheap compared to Dart, you are buying an intake already...you're current engine is 260 hp stock in 4 bbl trim. a vortec is 300 stock. Maybe 325-340 with a cam and better intake?
 
Vegard said:
Thank's for answer :)

You mean this cam shaft? Part# 3702 https://www.edelbrock.com/performer-plus-camshaft-kit-for-1976-95-small-block-chevrolet-3702.html

Not opposed, just want to keep the budget as low as possible. If the costs increases I will rather go for a stroker build. Dreaming of a 427 built on Dart block and heads.
Click to expand...

Ayuh,..... Horsepower in boats is dollars,. squared,.....

The 383 stroker, built to build big torque, from idle to 5,000 rpms is a boat motor,.....

The dart block build, with a huge cam, 'n huge flow, will become an anchor in a boat, in short order, without havin' a hot rod off-shore rocket, with a driveline that can easily cost in the 6 digit range,.....
 
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