A429's on a stock 95 bottom end?

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A429's on a stock 95 bottom end?

Post  paperman on March 26th 2016, 8:25 pm

Put a mill together out of mostly used parts. I think the used cam bit me as she's making metal and loosing valve lash. I need it together for an upcoming event. I have a solid stock 1995 EFI engine. Can I put my top on it with a decent cam? From the reading i do they should be 15cc dish with large valve reliefs. My heads have had a light surfacing but I have not cc'ed them. Anyone have an idea on what C/R would be close to and what I can run for a cam. Current set up was the old SVO .588/.614 with speed pro pistons.

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Re: A429's on a stock 95 bottom end?

Post  gt350hr on March 26th 2016, 9:05 pm

A flat tappet in the 250's or less should clear and the compression will be ok too. Hyd roller 240's or less should be ok too. Anything bigger could hit.

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Re: A429's on a stock 95 bottom end?

Post  SLord82 on March 26th 2016, 10:08 pm

I was literally just checking piston clearance on a 96 stock shortblock with a set of big valve doves last night. Of course they cleared with the stock cam but my solid roller comp 280xr wasn't even close to clearing. I believe it's around 240 @ .050 on the intake. I tried it advanced and retarded 4 degrees and it still hit.

Radial clearance seemed adequate but I didn't measure the clay, just eye-balled it. I should also note this was without head gaskets FYI.

If any one in the Dallas area has more cams I'd be happy to try them.

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Re: A429's on a stock 95 bottom end?

Post  paperman on March 26th 2016, 10:31 pm

at .650+ lift I could see it not clearing a stock piston. Im looking more for the high .500's. .584-.589

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Re: A429's on a stock 95 bottom end?

Post  SLord82 on March 26th 2016, 11:14 pm

Yeah, I figured it would hit but I thought I would check.

Though the max intake lift is .657 or so, it didn't make it anywhere close to that. The intake started to open and almost immediately made contact. It seems that the agressive ramps on a solid roller had more to to with it than total lift.

A less aggressive flat tappet might clear


Last edited by SLord82 on March 26th 2016, 11:22 pm; edited 1 time in total

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Re: A429's on a stock 95 bottom end?

Post  rmcomprandy on March 26th 2016, 11:18 pm

The 2.200" diameter intake valves of the A429 cylinder heads will not clear production E.F.I. piston intake valve notches with any camshaft larger than the marine hydraulic camshaft; (same as the A429 cam).

AND, that's really close.

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Re: A429's on a stock 95 bottom end?

Post  paperman on March 27th 2016, 7:46 am

Randy, the cam you speak of, is it the 6250-A460?

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Re: A429's on a stock 95 bottom end?

Post  rmcomprandy on March 27th 2016, 10:51 am

paperman wrote:Randy, the cam you speak of, is it the 6250-A460?  

YES ... All Ford Motor Company camshafts are group part numbered 6250.

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Re: A429's on a stock 95 bottom end?

Post  gt350hr on March 28th 2016, 12:37 pm

Max lifter velocity on a flat lifter cam is about .0025 per degree of rotation x1.73 =s .0043 at the valve IF geometry is perfect.

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