The Stovebolt Site Forums The Parking Lot '60-'66 Trucks 235 Cubic inch 3.8 or 3.9 liter

I am looking to purchase a pointless ignition system for my 61 apache w/235 ci engine. When I look for this part on the internet, some sites are calling it a 3.8 liter and others a 3.9 liter. Are there two, if so how do I know which one I have?
Thank you

235 cubic inches is 3.85 liters

some sites might round up and some sites might round down

Tim, thanks for the reply. Its funny, because if I tell the site I have a 3.8, they say the part wont work but if I say 3.9 it will fit. Have you any experience with the pointless ignition systems?

I have used a 12v and a 6v Pertronix unit in different 54 trucks. No problems. I do not think it provides noticeable extra power with a standard 216/235/261 engine. I'll use points in the two 6v 54 trucks we are restoring.

I am debating whether it makes any difference other than setting the points.

I bought my HEI distributor from Langdon's for my 61 235. Truck runs great.

HerrOtto,

It would be interesting to see what performance might be gained from in HEI in stock 216/235/261.

I saw no performance difference using a Pertronix unit in my 270ci 261 with dual carburetors and dual exhaust. Most likely, I almost never rev the engine to over 3000 RPM (80 MPH).

I'll set/check points.

I did some research, and turns out 235cid equals 3.85096 liters. So I guess it would be more feasible to round up to 3.9.

It's all out there

http://www.calculatorsoup.com/calculators/math/roundingnumbers.php