The most asked question about the 4200 is what is it...

We put a loonie ($1 Cdn coin) tin on the fender - label it B-ville fund.. guys get so curious they plunk a loonie into find out.. we donate the money...

For myself it about having something different.

Crower can supply rods for the 4200, J&E has the information to make forged pistons, and Darton can make sleeves (not overly expensive). ARP can supply the head and main studs - you need to order direct from them..

Spray it racing has decent prices on injectors that fit the stock in head location.

What ever you do stay with the stock bore size - it'll save you a lot of messing around with head gaskets. The GM head gaskets are as good as or better than a cometic head gasket.

The exhaust port needs about 4-6 work per port. The intake needs about 1/2 hour per port.

Last edited by efi-diy; 06/11/10 08:47 PM.

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them