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Old 02-25-2012, 07:46 PM
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building a 292 chevy for street/strip

Hello people, I am new here and looks like a good site to join. I have a few projects in the making at this point, a new ground up 96" stroker harley, a '36 chevy pu blown 496 BB, and '74 nova with a 292 six for street/strip Now speaking of the 292, is there anyone on here that has built any of these engine? If so what advice do you have on this subject. I am very capable of doing this blind folded, but can always use advice. Dad

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Old 02-26-2012, 02:28 AM
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There are two very effective ways to go fast with a 292 six.

Supercharge it. (144 weiand or edelbrock, Magnacharger MP122, or Buick V6 3800 blower ) or turbo charge it. (Buick 3.8 turbo, Ford tbird V6 turbo) (twin turbos from a Nissan 3.0L turbo 300Z)
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Old 02-26-2012, 02:37 AM
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pretty neat!
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Old 02-26-2012, 10:17 AM
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Blown 292

Quote:
Originally Posted by F-BIRD'88
There are two very effective ways to go fast with a 292 six.

Supercharge it. (144 weiand or edelbrock, Magnacharger MP122, or Buick V6 3800 blower ) or turbo charge it. (Buick 3.8 turbo, Ford tbird V6 turbo) (twin turbos from a Nissan 3.0L turbo 300Z)


That would be cool, but he is on a budget. Has little ones at home, they come first. He does want a hot rod, so I'll be helping him with it. Just thought maybe someone knew of the litle things that need be done on them so they will last. I tthink naturaly asperated will work just fine. Maybe 3x2, roller cam, and rockers and a good set of tuned headers, lite weight pistons and balanced, clean the head up w/bigger valves and powerglide tranny, 3;50 gears. I think I can do the engine under $2k.I am hopping somewhere around 350 to 400 HP. I was wondering if there are any oil problems with this engine? Dad
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Old 02-26-2012, 08:14 PM
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I remembered 35+ years ago a couple guys took small block chevy heads and cut the end cylinders off re-weled them and dropped it on a 292.. BIG improvement everyone thought i was nuts then i found a picture of newer version made with aluminum heads split + re-welded... WICKED!!
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Old 02-26-2012, 09:32 PM
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wicked indeed!
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Old 02-26-2012, 09:38 PM
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Quote:
Originally Posted by dadshogshop
That would be cool, but he is on a budget. Has little ones at home, they come first. He does want a hot rod, so I'll be helping him with it. Just thought maybe someone knew of the litle things that need be done on them so they will last. I tthink naturaly asperated will work just fine. Maybe 3x2, roller cam, and rockers and a good set of tuned headers, lite weight pistons and balanced, clean the head up w/bigger valves and powerglide tranny, 3;50 gears. I think I can do the engine under $2k.I am hopping somewhere around 350 to 400 HP. I was wondering if there are any oil problems with this engine? Dad
Some sites/info- http://www.crankshaftcoalition.com/w..._and_resources
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Old 02-26-2012, 10:00 PM
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Quote:
Originally Posted by dadshogshop
That would be cool, but he is on a budget. Has little ones at home, they come first. He does want a hot rod, so I'll be helping him with it. Just thought maybe someone knew of the litle things that need be done on them so they will last. I tthink naturaly asperated will work just fine. Maybe 3x2, roller cam, and rockers and a good set of tuned headers, lite weight pistons and balanced, clean the head up w/bigger valves and powerglide tranny, 3;50 gears. I think I can do the engine under $2k.I am hopping somewhere around 350 to 400 HP. I was wondering if there are any oil problems with this engine? Dad
Well, if he's on a budget he needs to forget about a 292 and look at a 250 instead. There are no cheap forged pistons for the 292, and there is nothing that will interchange at all in those engines from any other engine. At the HP he is looking to get, he will need them. Also, roller cams start at $600 and go up from there, same for a 250 also, and both require special roller lifters common only to the inline engines, also pricey. But, don't get me wrong, the 292 can be made into a strong contender. A group of us a while back on the Inliners forum did a lot of extensive dyno tests with both the 292 and 250 engines(over 200 dyno pulls combined) and found 350 HP is fairly easy to obtain with either engine, but not cheap by any stretch of the imagination. The 250 on the other hand can use forged pistons from a 307 engine, and several companies offer H-beam rods in both the stock length(5.700") and 6" as well. The "key" to the performance in these engines and the main expense is going to be in the cylinder head with removing the bolt bosses in the intake runners and installing the bolt-in "lumps", and putting in larger valves and porting. There are currently 3 brands of bolt-in "lumps" that were tested in these sessions, 2 of which are manufactured by Tom Lowe, and one of his consistently made the most HP in all of the testing done in both engines.
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Old 02-27-2012, 08:51 AM
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250 vrs 292

[QUOTE=CNC-Dude]Well, if he's on a budget he needs to forget about a 292 and look at a 250 instead. There are no cheap forged pistons for the 292, and there is nothing that will interchange at all in those engines from any other engine. At the HP he is looking to get, he will need them. Also, roller cams start at $600 and go up from there, same for a 250 also, and both require special roller lifters common only to the inline engines, also pricey. But, don't get me wrong, the 292 can be made into a strong contender. A group of us a while back on the Inliners forum did a lot of extensive dyno tests with both the 292 and 250 engines(over 200 dyno pulls combined) and found 350 HP is fairly easy to obtain with either engine, but not cheap by any stretch of the imagination. The 250 on the other hand can use forged pistons from a 307 engine, and several companies offer H-beam rods in both the stock length(5.700") and 6" as well. The "key" to the performance in these engines and the main expense is going to be in the cylinder head with removing the bolt bosses in the intake runners and installing the bolt-in "lumps", and putting in larger valves and porting. There are currently 3 brands of bolt-in "lumps" that were tested in these sessions, 2 of which are manufactured by Tom Lowe, and one of his consistently made the most HP in all of the testing done in both engines.[/


So what you are saying, is that theres no way to build the 292 for around $2k and reach 350 +hp?
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Old 02-27-2012, 10:15 AM
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I think once you start to price the parts required and the machine work needed to support the engine output you are seeking, $2K will go away pretty quickly, and you still wont be finished! The cylinder head will easily consume half of your $2K budget, if not a little more, and if you don't prep it with the "lumps" and big valves and porting, you wont reach your HP, or get close to it, the head is the key to making HP with these engines. Even if you don't use a roller cam(not needed for just 350-400 HP), there isn't much of this stuff out there that is used like flat tappet cams, so that leaves you with having to buy a lot of these parts new, and it just isn't cheap like SBC stuff is. Roller rockers is another costly purchase you will need to buy, there just isn't much of this Chevy 6 stuff floating around out here that is used. An average used aluminum intake manifold is often $250+. $2K will go away very quick, just be prepared to spend more to get it completed.
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Old 02-27-2012, 12:01 PM
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Quote:
Originally Posted by CNC-Dude
I think once you start to price the parts required and the machine work needed to support the engine output you are seeking, $2K will go away pretty quickly, and you still wont be finished! The cylinder head will easily consume half of your $2K budget, if not a little more, and if you don't prep it with the "lumps" and big valves and porting, you wont reach your HP, or get close to it, the head is the key to making HP with these engines. Even if you don't use a roller cam(not needed for just 350-400 HP), there isn't much of this stuff out there that is used like flat tappet cams, so that leaves you with having to buy a lot of these parts new, and it just isn't cheap like SBC stuff is. Roller rockers is another costly purchase you will need to buy, there just isn't much of this Chevy 6 stuff floating around out here that is used. An average used aluminum intake manifold is often $250+. $2K will go away very quick, just be prepared to spend more to get it completed.


Ok, then what about the 250? I was after more cubic inches, but can I pull something out of the 250 that would be impressive? How far will the $2k go? I can help with some of the cost over that. He just wants something impressive and different. Something you just don't see everyday. I have built many small blocks chevys over the years. What RPM's are these capable of?
I would think that the stroke being what it is, it could be made scream,,,,
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Old 02-28-2012, 12:32 AM
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Yes, the 250 is a contender for sure and often overlooked as an alternative. But again, right off the bat, most of the first half of your budget will be going into the cylinder head. 350 HP might not sound like a lot, but keep in mind this is just 250 cubic inches. A 350 will need to make 490 HP as a comparison to the 250 making 350 HP, so most if not any block prep mods you would do to a 350 for that power level, you would also need to do the same to the 250. Quality fasteners(ARP rod bolts, Main Studs, etc...)should be a part of your build also. You'll just have to shop smart and find bargains where you can on items like used Distributors, headers, valve covers, intake manifold, etc... and hold out for buying new stuff like pistons and cam and lifters, valves and so forth as you need to. If your starting from scratch without a lot of used pieces already accumilated, it would be hard to estimate how much a build would cost. But now that you see how you will need to prep it, it might give you some direction and a starting point. Hope that helps.
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Old 02-28-2012, 09:45 AM
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Originally Posted by CNC-Dude
Yes, the 250 is a contender for sure and often overlooked as an alternative. But again, right off the bat, most of the first half of your budget will be going into the cylinder head. 350 HP might not sound like a lot, but keep in mind this is just 250 cubic inches. A 350 will need to make 490 HP as a comparison to the 250 making 350 HP, so most if not any block prep mods you would do to a 350 for that power level, you would also need to do the same to the 250. Quality fasteners(ARP rod bolts, Main Studs, etc...)should be a part of your build also. You'll just have to shop smart and find bargains where you can on items like used Distributors, headers, valve covers, intake manifold, etc... and hold out for buying new stuff like pistons and cam and lifters, valves and so forth as you need to. If your starting from scratch without a lot of used pieces already accumilated, it would be hard to estimate how much a build would cost. But now that you see how you will need to prep it, it might give you some direction and a starting point. Hope that helps.



It helps alot. I remember back some years ago that we just cut out the bolt boss in the intake passages and replace the bolt with a stud and plugged the upper hole. It did help. But I see where you are talking about the replacement, with a "BUMP" I believe you called it, would make a much smoother flow,,hence more HP,,,,, Would you recommend a flat top piston and mill the head for more compression or use a domed piston. I think 10.5 would be sufficient for this horse power?? or should I seek 11.5 for this?? And maybe a good solid lifter cam somewhere around .550 lift w/320 dur ???? 2800 to 6000 RPM??? Maybe a 650 Holly or 3x2's. I do want to run pump gas
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Old 02-28-2012, 10:46 AM
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Dad, we just used flat tops in the 250 we did all the dyno tests with, so that should put you right on the mark for the needed compression and HP level you are looking for. Clay Smith, Isky and a few others have a good selection of flat tappet cams for these engines. Tom Lowe also manufactures his own brand of intake manifolds for these engines, PES, and has a matching set of "lumps" to match. This combo is 40 HP better than the Clifford intake with any other brand of "lumps", so that will give you a big boost right there if you choose to use it.
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Old 02-28-2012, 01:41 PM
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Quote:
Originally Posted by CNC-Dude
Dad, we just used flat tops in the 250 we did all the dyno tests with, so that should put you right on the mark for the needed compression and HP level you are looking for. Clay Smith, Isky and a few others have a good selection of flat tappet cams for these engines. Tom Lowe also manufactures his own brand of intake manifolds for these engines, PES, and has a matching set of "lumps" to match. This combo is 40 HP better than the Clifford intake with any other brand of "lumps", so that will give you a big boost right there if you choose to use it.


CNC-DUDE, I want to thank you for all the info, shows you never get too old to learn, I'm glad I found this site and joined it. When we get started on this , I will post as we go to let others know what we do and how it turns out, thank you very much, Dad
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