Recommendations for 350 build - Chevelle Tech
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post #1 of 8 (permalink) Old Dec 5th, 19, 12:55 AM Thread Starter
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Recommendations for 350 build

I have 291 camel hump heads, 2.04 & 1.6 valves, performer intake from the 90ís, holly 4160 carb, stock distributor and ignition. 350 block, not sure of internals. Roller rockers which are on the current 305 heads.

Would like recommendations for pistons, rods, cam, and crankshaft. Should I be looking at a roller hyd cam? 291 heads will need at least a valve job; but what else should I look at. What about block work? Thanks.


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post #2 of 8 (permalink) Old Dec 5th, 19, 8:11 AM
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Re: Recommendations for 350 build

What is your intended use of the engine ? In a truck for towing ? Drag racing ? Drive around all day on the street ? The intended use will determine a lot of the parts you need to get.

As far as block work its basically impossible to say without cleaning and measuring the block first.
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post #3 of 8 (permalink) Old Dec 5th, 19, 8:23 AM
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Re: Recommendations for 350 build

I see more issues with hyd Retro Rollers set ups then any other cam.. I would go solid flat.

Ever consider a 454? A stock, low compression would be all that's needed. I have a 78 454 low compression truck motor and I am amazed at the performance I get from it and all on 87 octane..
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post #4 of 8 (permalink) Old Dec 5th, 19, 8:47 AM
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Re: Recommendations for 350 build

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Originally Posted by hydro462 View Post
I see more issues with hyd rollers then any other cam

Jeff,


Not sure how you can say that. Other than on some Big Blocks that are pushing the envelope for hydraulic lifters in my opinion.


There are literally millions of hydraulic roller lifter engines running with very few problems to speak of. Virtually every production V-8 engine built in the last 30 years has hydraulic roller lifters and you very rarely hear of a problem with them.



Personally I will not build an engine with flat tappet lifters unless that is all that is available.

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post #5 of 8 (permalink) Old Dec 5th, 19, 8:59 AM
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Re: Recommendations for 350 build

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Originally Posted by BillK View Post
Jeff,


Not sure how you can say that. Other than on some Big Blocks that are pushing the envelope for hydraulic lifters in my opinion.


There are literally millions of hydraulic roller lifter engines running with very few problems to speak of. Virtually every production V-8 engine built in the last 30 years has hydraulic roller lifters and you very rarely hear of a problem with them.



Personally I will not build an engine with flat tappet lifters unless that is all that is available.
Thanks Bill, I meant to say Retro Roller set ups.. If the block was designed for rollers then your home free.. I would always go with the roller block if I can.. Rollers are no doubt the best set up going.. One of the local builders was showing me why retro rollers are a bad idea on a Pontiac motor. I didn't fully understand him but it had something to do with the tolerances and strength at the part of the block that holds the lifters in place.. The Small Block Chevy roller motor he was comparing the Pontiac block to was much beefier at that part of the block..
I have friends with retro roller set ups and they are always taking them apart because of some issue.

Johnson Hylift is making flat tappet lifters again so there nothing to worry about as far as flat tappets go... I have well over 100,000 miles on the new formula, Mobil 1 5-30, on my flat tappet motors.. Frankly I think the oil deal was just to get the cam companies out of warrantees when they sold all those bad lifters..
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post #6 of 8 (permalink) Old Dec 5th, 19, 9:55 AM
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Re: Recommendations for 350 build

Quote:
Originally Posted by hydro462 View Post
Thanks Bill, I meant to say Retro Roller set ups.. If the block was designed for rollers then your home free.. I would always go with the roller block if I can.. Rollers are no doubt the best set up going.. One of the local builders was showing me why retro rollers are a bad idea on a Pontiac motor. I didn't fully understand him but it had something to do with the tolerances and strength at the part of the block that holds the lifters in place.. The Small Block Chevy roller motor he was comparing the Pontiac block to was much beefier at that part of the block..
I have friends with retro roller set ups and they are always taking them apart because of some issue.

Johnson Hylift is making flat tappet lifters again so there nothing to worry about as far as flat tappets go... I have well over 100,000 miles on the new formula, Mobil 1 5-30, on my flat tappet motors.. Frankly I think the oil deal was just to get the cam companies out of warrantees when they sold all those bad lifters..
The Pontiac blocks were notoriously weak in the lifter valley and that's one of the biggest improvements to the 455 HO blocks.


Sane HYD roller cams in Chevys are mostly a non-issue if installed correctly because the lifter valley is built much stronger.
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post #7 of 8 (permalink) Old Dec 5th, 19, 11:01 AM
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Re: Recommendations for 350 build

If the OP can afford it, I would suggest a hydraulic roller cam, the advantages out weigh the cost savings of a flat tappet cam. A roller cam offers less friction and wear and offers more durability and an improved lobe design over a comparable flat tappet cam. I have five engines with hydraulic roller camshafts from various cam and lifter manufacturers and they have been trouble free.

In the end it depends on what the intended use of the engine is and what type of performance the OP desires. There are several build threads on this site with basic 355 small blocks using affordable iron heads and moderate camshaft grinds, with impressive results.

I agree a stock type 454 can be a satisfying street car engine, but the 454 will also offer decreased fuel economy over a 350 of comparable power.
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post #8 of 8 (permalink) Old Dec 5th, 19, 2:27 PM Thread Starter
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Re: Recommendations for 350 build

The motor will go in a 1966 chevelle Convertiable which came from the factory with a 327 which is gone. Just meant for the street with around 1000 miles per year. I will rebuilding the current 350, or a 396 I have in the garage, or buying a mid 60ís 327 block orginally a powerglide car that now has a 350 TH..


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