Porting 4V Cleveland heads
Hi guys, in the process of rebuilding my Cleveland after an unfortunate incident with rounding a couple of cams lobes. Not to worry, everything is coming along nicely. Last thing to tackle now is the heads.
My question to you gurus out there is in relation to 4V Closed Chamber heads. I have a pair that were on the engine than need recoing. I've purchased a new set of Stainless Ferra 5000 valves, Crane springs and retainers. All good so far, just need to send them off to get new K line guides, etc. However, before I get them done I was wondering if anyone knew of mods I can perform to the heads that will make these flow any better, either in the intake or exhaust? I note that in the exhaust port there is a very defined raised (lump). So questions are:
Would it be worth while removing the lump and blending the port?
What about the short turn radius in the intake and exhaust?
Would it be worth smoothing the sharp edges in the short turn area?
What about modifying the bowls?
I am pretty handy with a die grinder and have experience porting heads, not 4V Cleveland heads, more into Windsors. I'm not going to assume anything, just in case I turn a good set of heads into shit.
Engine will be Stock stroke 351, out 0.30thou, cam limited to around 545" lift on the exhaust side. Heads quench 4Vs, flat top Speed pro forged pistons, Manifold is a Strip Dominator, Carb is 800DP, MSD 6AL and MSD Dissy. 2" Primary pipes, 3.89 gears, top loader, 26" tyre.
Should I leave the heads as they are with a port match to gaskets, and mild cleanup of dags, or should I spend a little time cleaning these up? Are there considerable gains to be had with 4V heads, or should I leave them alone as they'll make good power stock?
Pretty hard finding good information on porting 4V heads, most posts refer to Windsor 4V heads.
Cheers guys, all replies are much appreciated. Oh lastly, please no posts about Alloy heads. I know they're better, I'm not interested. I need info on iron heads. Thanks
XY GT Replica (Track Red), 351 4V, Forged Pistons, Rollers, Crower Solid Cam, MSD 6AL Ignition, MSD Distributor, Pacemaker 2" primary pipes, Twin Two and a Half inch exhaust, 31 Spline Top Loader, Daikin clutch, 31 Spline 3.5 Nodular 9", HO Brakes, Simmons B45s. No stereo, nothing but the sound of SWEET Cleveland music...ahhhh, the only woofer is the one that's in my yard. $$$