my buddy used aluminum heads and exhaust in his 28 Cigarette SS, fukked the boat all up, so depends on the boat and how much weight...

Because of the weight balance? I quess where you lighten them up makes a difference. Wellcraft once told me that for every 100 pounds I could remove from the cockpit forward (particularly the forward cabin) would equal roughly 1 mph in top speed. They never mentioned the bulkhead back.

http://www.hotrod.com/how-to/engine/...l-block-chevy/



Mild-412HP 383
This is a simple and relatively inexpensive combination of a one-piece roller cam block with a stroker crank, 9:1 compression with dished pistons, a tame GM Performance Parts hot hydraulic roller cam, 1.6:1 roller rockers, factory roller lifters, a set of modified Vortec iron heads, an Edelbrock Performer RPM Air-Gap intake, a 750-cfm mechanical-secondary carburetor, and a set of 13/4-inch headers. The only upgrade necessary is some machine work and better valvesprings for the Vortec heads to accommodate the additional valve lift. This combo makes excellent torque with 466 lb-ft at 3,500 and 415 at 5,500 rpm. Even with a stock converter, this is a tire shredder.


DESCRIPTION PN SOURCE PRICE
Block, one-piece seal used junkyard ${{{100}}}.00
Scat crank, cast, one-piece seal 910526 {{{Summit}}} Racing 169.95
Stock 5.7-inch rod rebuilt Machine shop 150.00
Piston, Speed-Pro hypereutectic HC860-03 Summit Racing 36.69 each
GMPP Vortec iron head 12558060 Scoggin-Dickey 551.50
GMPP Hot hydraulic roller cam 24502586 Scoggin-Dickey 192.95
GMPP valvespring kit 12495494 Scoggin-Dickey 32.95
Edelbrock RPM Air-Gap 7501 Summit Racing 212.95
Holley 750 mechanical secondary 0-4779C Summit Racing 433.95
Hedman 13/4-inch headers application specific Summit Racing 193.95


Read more: http://www.hotrod.com/how-to/engine/...#ixzz3JSwRKDg3
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Stoker's are very cost effective and look at the torque curve's

all 24-7 boats look like they are gonna sink stern first when anchored or tied to the dock.

Mine sits pretty flat, guess its due to the light weight of the sbc/alpha drive combo!

http://djmikeyc.com/media/1981Panter...llage_dock.jpg

that is one nice looking boat.

Thank you!!!

I concur, sweet ride!!

Thanks!!!

Agree, looks good...what's the sheriff boat behind there doing? Taking a pic so he can look you up later when you show him your wake?
I have the earlier non vortec TBI heads and dish pistons that are more prone to detonation. My 64cc heads are supposed to yield 9.3 to 1 CR. Never saw any detonation with the factory cam at 34* total on a 23 pitch prop and 4400 RPM.
I did a 262H this past spring, because it's the most they recommend with regular exhaust. Also did Comp springs, lifters,keepers etc, with a set of no name aluminum full roller rockers (Pro Comp). I started off with a conservative setup, then kept on using the boat and never got to really maximizing the timing. I ran it all summer at 28* all in. It was really good on fuel and had some snappy mid punch, but same 59 mph top speed at higher rpms with a 21 pitch prop. I didn't have the water conditions to trim it out and try to find every mph. Our lake has speed limit so I have to pick my spots. I finally set the timing ahead when I winterized it.
But fuel. Vortecs are more detonation resistant and lake water is nice and cool, run a 140* thermostat and you won't have any trouble at 9:1. Dynamic compression will be way lower. Vortec heads are supposed to need less timing too, maybe start out with 30 degrees all-in.
Regarding fitting the rockers in the factory valve covers; mine hit some of the internal valve cover structure. I just removed the pieces that were touching rockers. Now the insides of the VCs look like aftermarket ones do.
I'm thinking I should degree the cam in the spring and might retard it for top end if there's some room.
Some of the hot rod guys seem to believe Comp tends to grind advance into their cams. So I am going to check.
Your project looks good, I will be following your thread!