4 bolt cap desicions

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4 bolt cap desicions

Post  J.Toney on January 23rd 2016, 12:57 pm

Have a bare D1 that hasn't been machined at all, 10.310 or better deck hieght
Also have a 2-bolt DOVE with boss bulkheads, but deck is ~10.290 if I recall.
I have 2 sets of caps, A-460's and stepped Pro-Grams for the later blocks.

The original idea here was to adapt the Pro-Gram stepped caps to my D1 block, the machinist had done this install before, , which is why I brought it to him. For one reason or another, he won't be doing the job, so I'm back to sqaure one. I'm wondering if the A460 caps would make for a legit alternative to the Pro-Gram's? Or 6/half dozen?

Also, COULD tear down the DOVE block and use caps on that, I'm guessing with less install hassle, but my preference would not to. At the same time, I've never been down this road, which is why I'm asking for insight.

Basic build is 4.420x4.300, 528". Using A460's, 13-14:1, solid roller, 274@.050. Thanks for any input!
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Re: 4 bolt cap desicions

Post  Paul Kane on January 25th 2016, 12:49 pm

J.Toney wrote:Have a bare D1 that hasn't been machined at all...Also have a 2-bolt DOVE with boss bulkheads...

I have 2 sets of caps, A-460's and stepped Pro-Grams for the later blocks.

The original idea here was to adapt the Pro-Gram stepped caps to my D1 block...I'm wondering if the A460 caps would make for a legit alternative to the Pro-Gram's? Or 6/half dozen?

Also, COULD tear down the DOVE block and use caps on that...which is why I'm asking for insight.

Basic build is 4.420x4.300, 528". Using A460's, 13-14:1, solid roller, 274@.050. Thanks for any input!
Either set of caps may be installed to either block with the correct modifications (to either the caps or blocks depending on the block/cap combination).

Yes, the A460 caps may be installed onto your D1 block. The A460 cap width will be wider than the block webbing's width once the cap registers are machined flat to the pan rail, and you would install them as floating caps with locating pins (just like an A460 block) rather than interference fit (like a standard 2-bolt block).

And yes you may use them on the D0VE block as well, same machining approach. I feel machining the Programm caps to fit the D0VE block (via interference fit) will be the strongest...but any possible setup (ie, any block/cap combo) will be plenty strong for your NA parts combo.
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