Reply to "B. Goyaniuk's motor questions"

Bohdan,

the AFD 4V head does not have full size 4V ports, the floors of the ports are raised, or filled in. To run any 4V manifold with full size 4V runners with the AFD 4V head would require filling in the manifold runners to match the AFD head's ports. All that trouble doesn't make sense to me when CHI does make a head with full size 4V ports. The AFD 4V head is a good match with the TFC & Parker manifolds that have runners which have raised floor runners as cast, no extra work needed.

I know you are interested in possible future fuel injection system, which influenced my recommendation to you to purchase 2V alloy heads, the Trick Flow company is supposed to be developing a fuel injection manifold for Cleveland 2V heads.

Cylinder overbores are made in increments of 0.010"; i.e. 0.010", 0.020", 0.030" etc, etc.

Speaking in the case of the Cleveland engine ONLY, the heads are NOT the weak link in making power, so in my opinion the logical order for modifying the engine is stroker crankshaft, roller cam & then modern heads. In fact, the increased displacement & higher valve lift actually improve the drivability of the 4V iron heads! The 4V iron heads are being used successfully to make 750 bhp at 7300 rpm on 7 liter engines. They are not a weak link in making power.

I want to point out two things to be aware of regarding cleveland camshafts: First, they were developed by the cam grinders to work with the cast iron heads. The modern alloy heads, with their higher velocity intake ports, warrant the use of a cam custom ground for optimization with the flow characteristics of the alloy heads. Not that you can't use an off the shelf cam, you can, but an "optimized" cam would be better.

Second: the retro fit hydraulic roller cams are available from Comp Cams & Crane Cams, these two companies take two different approaches. Comp takes the less expensive approach using Ford style roller lifters & dog bone bars for orientation. The lifters are less expensive, not as durable and have less rpm potential compared to the lifters developed by Crane Cams. Comp Cams hydraulic roller cams are ground on iron cores with a reduced base circle lobe design to allow the Ford style lifter to sit in the lifter bore properly. Crane Cams uses the more expensive roller lifters that are joined in pairs with tie bars. This lifter is designed specifically for the retro-fit application, so the cam does not require a reduced base circle for the lobe design. The Crane cams are ground on billet steel cores. Neither camshaft system is inexpensive, but Crane is the more expensive of the two, in this case you get what you pay for. Do you really need the greater durability of the Crane roller cam & lifters? Most likely not for purely street applications, but in a motor that will be run hard, even in amateur competition, it's nice to have a margin of safety. Caveat emptor.

For your requirements I would recommend the Crane hydraulic roller cam part number 529551 or the Comp Cams 290HR hydraulic roller cam part number 32-541-8.

your friend on the DTBB, George