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Old 08-13-2010, 06:13 PM
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Early Chev/roller Cam Chev Differences

Gidday guys. Justplanning my next build so I can start buying items over the next 12 months. I am planing on building my first roller engine and plan on using factory roller block. Is there anything specific I need to know about these blocks. A few questions:
Can I use heads made for early non roller blocks(dart iron eagles etc)
Can I use pistons and rods for a early block with these later blocks?
What parts are compatable between the two ( dizzy? fuel pump? flexiplate? starter? etc)
The project is a while off as I haven't even finished my current one, but I'd like to start buying parts now.Just need to know the differences as it will be a hot street carburettor 383 engine. Thanks
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Old 08-13-2010, 09:06 PM
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Yes,
Yes,
Dizzy, Yes
Fuel Pump, chances are it won't have a mechanical pump boss
Flexplate, chances are you'll need a flexplate for a one piece seal block,
Starter, Yes
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Old 08-13-2010, 09:26 PM
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Quote:
Originally Posted by belairheaven
Gidday guys. Justplanning my next build so I can start buying items over the next 12 months. I am planing on building my first roller engine and plan on using factory roller block. Is there anything specific I need to know about these blocks. A few questions:
Can I use heads made for early non roller blocks(dart iron eagles etc)
Can I use pistons and rods for a early block with these later blocks?
What parts are compatable between the two ( dizzy? fuel pump? flexiplate? starter? etc)
The project is a while off as I haven't even finished my current one, but I'd like to start buying parts now.Just need to know the differences as it will be a hot street carburettor 383 engine. Thanks
Yes
Yes
You WILL need a new flexplate
You can use a mechanical fuel pump, IF the block is machined for it, most were not, but have the boss

Also, make SURE its a roller block, just cause its a one-peice rear main, doesn't mean its roller.
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Old 08-14-2010, 02:32 AM
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Thanks for that. Possibly not being able to use a mechanical fuel pump is a bit off putting. I have never used an electric one before.Good news about the other stuff being compatable though. So leets say I am 100% building a small block chevy roller motor. Are there any other benefits of using the later factory roller block rather than the early one with a retrofit roller cam other than cost?
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Old 08-14-2010, 05:59 AM
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Quote:
Originally Posted by belairheaven
Thanks for that. Possibly not being able to use a mechanical fuel pump is a bit off putting. I have never used an electric one before.Good news about the other stuff being compatable though. So leets say I am 100% building a small block chevy roller motor. Are there any other benefits of using the later factory roller block rather than the early one with a retrofit roller cam other than cost?
If you want to run a cam w/more than about .354 LOBE lift (~0.530" valve lift, w/1.5: ratio rockers) can cause problems. What can happen, is the smaller base circle can allow the "dog bone" to lose contact w/the OEM lifter. Not good.

Crane (and likely Comp, etc.) made lifters to prevent this, they use a different length pushrod than OEM. Or you could design the valvetrain around a higher ratio rocker arm and a cam w/less lobe lift (and thus a larger base circle).

If you get a block w/o all the accoutrements for an OEM roller, Chevy used two different designs of the cam retainer plates, an early-model wide-bolt spread (3.620 inches) and a later-model narrow-bolt spread (3.294 inches).
GM early cam retainer plate- #10088128 Scoggin-Dickey.
GM late cam retainer plate- #10168501 Scoggin-Dickey.
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