2.0 build to 2056 or 2270?, Which cam would be best ?? Going carburetorated, with 96mm pistons Options

[zman914]

Looking to do a 2056 or 2270 build from a stock 2.0. Changing over to carburetorated, with 96mm pistons.. Looking for good cam advise. I'm looking for more hp, but very reliable.

[Jack Standz]

Looking to do a 2056 or 2270 build from a stock 2.0. Changing over to carburetorated, with 96mm pistons.. Looking for good cam advise. I'm looking for more hp, but very reliable.

The biggest difficulty for building a 2270 for a while was finding a 78.4/78mm type iv stroker crankshaft. But, currently it looks like they're available again. With aftermarket rods, you should have very little if any clearance problems with the 2270. So, the main difference between building the 2056 versus the 2270 is the size of the spacers between the case and the cylinders (and the crankshaft stroke of 71 or 78).

Pick a Webcam (with matched lifters) appropriate for the application you will be putting the motor. Or we like tool steel lifters and crower springs. With the right cam choice it'll run just fine on carbs.

[Dave_Darling]

With aftermarket rods, you should have very little if any clearance problems with the 2270.

Is that true now? I know that in the past, people had to run reduced base circle cams to keep one of the rods from colliding with one of the cam lobes... Even with aftermarket rods!

--DD

[Jack Standz]

With aftermarket rods, you should have very little if any clearance problems with the 2270.

Is that true now? I know that in the past, people had to run reduced base circle cams to keep one of the rods from colliding with one of the cam lobes... Even with aftermarket rods!

--DD

Yes. But, your point is well taken. Run the 1" base circle in stroker motors for clearance, Clarence.

Here's what European Motor Works says:

Note: Most camshafts can be ground on a 1" base circle for clearence on a large stroker application.

https://www.europeanmotorworks.com/type-4/c...ifications.html

Webcam also sells the reduced base circle cams, which are the cams we use in our builds.


Also (a 2270 has a 78.4/78mm stroke):

https://shoptalkforums.com/viewtopic.php?t=...5e&start=15

by Type 4 Unleashed » Thu Feb 20, 2020 1:03 pm

And one other issue: And this is for anyone who thinks they need a Reduced Base Circle Cam. I've found RBC Cams are needed for 82mm strokes and larger. With the right rod up to 80mm there's enough clearance if the rods are aftermarket with 5/16" bolts but should be checked to be sure, 80mm strokes also have to be checked for clearance if the bolts are 3/8". RBC Cams tend to wear faster than standard base circle cams, so I try to stay away from them as much as possible. Brook I don't know what rods you used, you didn't post that info.
Richard