RolLeR BloCkS WitH MECH. fuel pumps? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-12-2010, 07:54 PM
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RolLeR BloCkS WitH MECH. fuel pumps?

someone said gm does make some roller blocks with the proper machining for a mech. fuel pump? does anyone know what years or castings i should be looking for?

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Old 08-12-2010, 08:53 PM
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Quote:
Originally Posted by MikeAhrado
someone said gm does make some roller blocks with the proper machining for a mech. fuel pump? does anyone know what years or castings i should be looking for?
Not from production, you'd have to go to GMPP for a Production based race block to get the combination of features you're seeking, something like 10066034 would build you a 2 piece rear seal 350 with a factory roller cam as well as a mechanical fuel pump provisions all machined and ready to go. Or use 10105123 for a one piece rear seal crank with the same provisions.

Lookie here: http://www.jrgmparts.com/GM_Performa...y_small_b.html

Bogie
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Old 08-12-2010, 08:58 PM
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Check Marine usage. Blocks are rare and expensive.
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Old 08-12-2010, 09:01 PM
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Check out Summit's stroker blocks. 1 piece rear main seal, roller blocks, with provisions for a mechanical fuel pump.
http://www.summitracing.com/parts/SUM-150100/
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Old 08-12-2010, 09:20 PM
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All of the ZZ series SBC's I have owned and ever seen had the provision for a mechanical fuel pump.



Both of my ZZ430's , my ZZ4 and my ZZZ Chevrolet crate engines have provisions for the mechanical fuel pump.



part number # 12561723
This partial engine includes the ZZ4's forged
steel crankshaft and comes with LT1-style pistons
and connecting rods. It does not include the camshaft,
cylinder heads, lifters, timing set, front cover, oil pump,
oil pan, balancer, or flexplate.

The block is available separately also




part # 10105123
Cast iron 4-bolt block 1 piece rear main seal
4.00 bore
Machined for hydraulic roller or flat tappets
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Old 08-12-2010, 09:23 PM
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i have a mech.pump on my 1987 chevy caprice 5.7L/350 roller block.it's factory,if that helps you.my car is carbureted.
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Old 08-12-2010, 09:23 PM
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woah thanks for all the help lol. but im on a BUDGET haha.
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Old 08-12-2010, 09:25 PM
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im looking to spend about 700-800 for the short block...
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Old 08-13-2010, 08:15 AM
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There were factory blocks with the fuel pump boss and roller cam setup, you just have to do some digging. They weren't all on carb'ed vehicles during the transition period either, some came with a block plate on it.
OTOH, almost all of the roller blocks have the flat area machined and one 3/8-16 hole drilled and tapped. I built a fixture to come off that hole and drill those blocks for a mechanical fuel pump for quite a few circle track guys in certain situations. It takes some silly long drills and tooling, but if you look around I would think you could find a shop capable of doing it.
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Old 08-13-2010, 04:51 PM
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my 638 block is machined for it, out of a 1990 Burb (73-87 style)

but my other 638 block is from a 1994 K1500 and doesn't have it.

so its hit and miss, you have to hunt for one, ive had 4 One-Piece blocks go through my hands, each one was different in its one way.
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Old 08-25-2010, 09:40 PM
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If I were hitting the yards looking for a block, I'd take an old fuel pump push rod with me to test them with. I've heard that some of them are not completely machined for the rod, even if there's a hole present.
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Old 08-25-2010, 11:16 PM
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Quote:
Originally Posted by jimfulco
If I were hitting the yards looking for a block, I'd take an old fuel pump push rod with me to test them with. I've heard that some of them are not completely machined for the rod, even if there's a hole present.
true, i had a 1988 block that wasn't fully machined. and my 1990 block is
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Old 08-26-2010, 07:20 AM
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Your best chances will be w/880 and 638 blocks. Others may be machined for the mechanical pump, but these two are definitely available w/the pump hole finished- as well as unfinished, so you still need to check.

The one shown below is a 880 block, w/o finished mechanical fuel pump mounting.
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Old 08-26-2010, 07:30 AM
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Quote:
Originally Posted by jimfulco
If I were hitting the yards looking for a block, I'd take an old fuel pump push rod with me to test them with. I've heard that some of them are not completely machined for the rod, even if there's a hole present.
My shortblock came with that same problem, the pump pushrod hole was partially drilled.
As the block had come from America to Spain I was´nt about to return it for another so I drilled it out myself.
I wadded up the drill bit and all around the area with grease to catch the swarf.
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