My 221 buildup

[Anonymous]

G'day fellas, I thought I'd post my ideas for my new engine. Its going into a XT Falcon, stock BW35 and 3.5:1 BW single spinner diff.
221 +.030 and zero decked
ACL 8cc dishtops, stock rotating assembly.
2V head, ported exhaust, 1.73in and 1.48ex valves, new stock springs.
Port divider and Crow 63613 cam.
Pacemakers and twin 2inch exhaust.

With the chambers opened up a bit around the valves and a zero deck I'm aiming for 9.3:1 static compression.
I'm hoping this combo will create somewhere around 170-180hp@4500 and 230-240ft/lb torque@3000. My aim is to have it pull hard off the line and shift at 4500 so theres no real need for beefed-up valve train, big cam, etc.

I dont know what carby to use yet, I have a 350Holley and a 2bbl Carter from a 265 Valiant, but I'm thinking a XF Weber may be the go.

Has anyone got a similar combo?, anything you would change?

 

[addo]

I'd suggest a reground cam if possible - it will negate the need for a hardened distributor gear. Plus it's cheaper.

Also, check your spring adequacy; the 63613 generally is recommended to use the Crow aftermarket single spring set with about 30% extra pressure.

Progressive carbs generally aren't something I'd suggest on a 2V; the plenum design may cause odd transitional issues. As they are made, the oversize intake ports/runners and alignment of throttle blades means that the best constant flow path is developed in runners 5 and 6, but in order to get other cylinders well-fuelled these ones can often run a little rich. (EFI would be a great improvement). A larger carb spacer as suggested by Drift, will help keep some turbulence in that plenum area - a good thing.

Cheers, Adam.

 

[Anonymous]

Thanks for that Adam,
I'm not keen to go to FI yet, I like to live in the past :roll: ,so sticking to carby's you reckon the 350 Holley is the way to go? it would be the easiest to re-jet and set up.
I'll definately check out the springs Crow recommends but at .382/.408 lift that cam isn't a lot over the standard lift. With the cam gears, why do Crow cams eat them?, they dont mention needing to change the gear yet I've read a few posts about the wear they have caused. Could it be something to do with the oil pump flexing under pressure and changing the angle of the gear in relation to the cam increasing wear?

 

[lyonsy]

you only need the crow gear for the xflow dont ya?
drift

 

[addo]

It's my belief that the cam blanks we're now being sold, are made with the wrong helix on them for the distributor. Just a thou or two off, and the mismatch is enough to ruin the dizzy gear.

Don't like Holleys myself, but yes they will work passably.