Originally Posted by xyfmtjoe
Ok just throwing around some ideas here as I may have a bit of coin to throw around (selling my ute) and just seeing what the thoughts of the masses would do.
I already got some plated 4vcc heads and have just had my roller cam arrive from the states The specs are 262 int. @ 050 , and 272 ex. @ 050. The lift is 623 on int. and 649 on ex. The lobe sep is 106 and the int cl is 102.
Already got a 4V funnelwebb and 750dp blah blah!
Now the tricky bit!
I was thinking of either offloading my 4v's on ebay and buying a set of bare AFD4v and buying the +100 valves and roller springs ect ect to suit the cam with flat top forgies that I got in shed already with polished and peened rods, balanced and the normal bits and pieces or;
After reading jims combo 10.75 @123
I got to thinking
(that hurt) I got simmilar bits floating around here other than the 393ci kit so I did some research. I can get my block sonic checked; 0 decked, bored and all the usual prep supplied with a full kit ie; all bearings and rings ready to assemble for $4400 or maybe gat the bits to make the kit separately as ive seen the cranks for about $740 pistons maybe a grand? and rods off ebay at a way better price! would still need valve and spring setup in the 4v irons
So can we without any flaming, name calling or nasties have an input from ppl with constructive idea's or comments and no I cant afford both
as much as I would like to
Okay, here's the real deal. That camshaft isn't really a preferred choice for AFD 4V heads. You'd want a much closer to a single profile grind, as there isn't the kind of slow-down in the exhaust ports and the "stale" inlet ports at low RPM as there are in the iron heads.
You seem to be trying to build your engine around a camshaft. Not that that's bad, just that it isn't "overly right." What you want to do is work out your inches, your compression ratio, your cylinder heads and then grind a stick to match it and the combination that you're building. A lot of what a "combo" is will include the vehicle and the environment, which includes the intended usage.
Since you have the camshaft, I'd go forward with the iron heads and build a stroker bottom end. Later, when funds catch up, I'd swap the iron heads and camshaft for AFD 4Vs and new cam to match the combination.
The cam that I'd think you want (not knowing jack about your vehicle) would be something along the lines of a 272*/274* @.050 with about .740" lift probably on about a 106* LSA. I don't think that 102* is a very good idea with the AFD heads, in fact, depending on how heavy the vehicle is and how much transmission, gear ratio and tire you have, I'd probably try to build a lot more dynamic compression and run racing fuel. I'd probably try to get about 12:1 or 12.5:1 static compression and run a camshaft in the realm of about a 108*. However, I'd look at probably 9 million choices ranging from 113*-102* to see what made the nicest, fullest power range with emphasis on making torque, not peak HP. The cam "recommendation" above assumes a minimum of 393 CID.
I'd suggest selling the block and buying a Dart Windsor block and build a Clevor with Cleveland mains and big bore. Obviously, that would toss just about everything but the iron 4Vs into the "for sale" pile. There is something really amazing waiting for anyone who musters up the courage to try it. How does 596 FTLB @ 5000 RPM sound out of a 434 CID combination?
However, this is probably not a reasonable choice for your budget and/or your intended timeframe for completing the project. With what you have, I'd say do up the bottom end in a stroker combination, which will flatten out your cam quite a bit while adding a lot of torque. A 750 carburetor isn't enough carb for this engine, even if at 357 CID. I have an 800 on my 357 with a baby solid flat tappet cam at .549/.570 lift and 238/248 @ .050. Your cam is much more "high speed," and that is going to want to flow some air. I'd be looking at something around 850-900 CFM as a good starting point with a 357 and probably 900-1000 CFM with a 393.
If you clamp those iron heads onto a stroker base, you're going to enjoy them a lot with that camshaft. Otherwise, I'd be thinking differently in terms of designing your combination, especially your camshaft, around what parts you're going to have surrounding it not the other way around.