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Old 11-12-2009, 08:18 PM
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Flat cam in F4 Roller Block

Was wondering if this could be done. I know most are thinking why, but in a siituation where budget is done.. and I will put back to roller down the line, just can't afford $300 cam, new lifters and shorter push rods right now. My motor budget is done. I have a good roller and if I can use it with a flat cam in the meantime.. this is what I will do.

What crank would need to be used. Early or late. Is the F4 block machined for the one piece sel only. What rods also. I believe I was told I could use the early rods I have (football with arp bolts) on a late (F4) crank.

I hear the lifter bores are longer on F4. Does this effect anyting with flat tappet cam.

Again, the buedet it closed on motor.. because I still need to build tranny. May not make sense to some, but makes perfect sense to me especially since I can do a simple swap later. I'm all ears. Having a challenge finding a non roller block so far. I really did not want to use this roller, but I'm ready to get a motor built.


Last edited by Carlos9; 11-13-2009 at 08:11 AM. Reason: duplicate post
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Old 11-17-2009, 01:14 PM
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Hi Carlos,
On craigs list there is a 72W block for a hundred dollars in Titusville, that's a bare block w/caps

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Old 11-17-2009, 02:24 PM
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Thanks. I was able to get another block. Actually the machine co. that swrewed my block up replaced it with another one. It's a D4 block so I can go ahead with my build.. that is if my builder buys off on the work. He's real pick about piston/bore clearance. The other block had 2 cylinders that were .002 overbore and he did not want to use it.

This brings up another question, what's acceptable clearance wise with a forged piston (i forget the allow) that doesn't expand that much. A Probe FPS series piston.
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Old 11-17-2009, 09:45 PM
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It's Probe's piston, makes sense to ask them if you want the best answer. Generally forged are .0035-.0075" depending on how hard and how hot you will be running it. The hotter it will get, the more clearance you will need .
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