Thread: 427 sbc engine

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we are in sort of the final area of diveloping the specs of a 427 small block chev engine---we want strenght, forged components, light weight(alum heads) run on pump gas, etc, etc

Any thoughts on a project like this????

look at the scat crank or ohio crank and use scat H beam rods with the mahle pistons or srp or look in to the pbm mass kit for street should hold up just fine . for heads i use dart or bmf roller cam custom made by erson . but that just me

Pat--we pretty much have all that worked out---It was the fact that 427 is a magic number---as compared to 355, 377, 383,406,etc---issues or parts specs center around items like camshaft clearance, block clearance for the rods, piston CH, having a sensor for fuel injector, just small issue stuff, but where the total issues are worked out so as it isn't too difficult for the average guy to put together-

We are placing the order for the first 8 blocks tomorrow and working final details for cylinder heads, valve spacing, sizes, etc.

we want to have lite weight high quality components for response, but yet have a strenght factor for high horsepower---a unit that can run on the street with pump gas , but can be taken higher and harder at a track and still be driven home.

i was thinking you were asking any thoughts on light weight mass parts at a far price. not what i was thinking for the allround engine cid.my thinking is if you want a big sbc then it a good way to go but you can build a 512 or 496 alum head engine for less bang for the buck and not that much weight or the ls1 engine other then the add on to make it run with a dist and carb if that what you want if you can live with the looks of the ls1 deal with the oil pan and the missing head bolts over all a good engine. if you have guys that want the 427 ?around my parts? i would say not many there is still some guys building 327 and 350 with old out dated heads GM heads . the sbc is still very cheap to build as a mild engine to move some thing and small in size . thats a big step up for the back yard sbc guy . i sure your looking to sell over all the usa more then in your area .i could not say if it would take off as a good seller if your asking that

Well, we have blocks and cylinder heads ordered----we are working out the supply of the rotating parts--need to be readily available more or less off the shelf parts. We are trying to eliminate all those areas that we have seen botched up by people who werent as knowledgable as they gave themselves credit for.

Our goals are to have sbc and sbf at 427 inches and we are going to to bbc that will be bigggg---want 4.600 bore and 4.5 stroke at standard deck height---choices are being worked out to have strong durable forged components and lite weight heads and accessories.

We have been watching costs go thru the roof for used core engines and after dealing with the cleaning and chemical disposal hazmat stuff are going to offer a semi custom engine built with new high grade components, as with companies like Dart building blocks, etc, all the crankshaft companies and the shelf pistons and as cast or cnc ported heads.

well i sure know about the cleaning part i spend more time cleaning parts then machining them and it the end of the day you can not make the money to pay for the soap less you have the sunnen ampro bake and blast. i have a 500 gal hot tank and a jet and still spend time with the wd 40 to hold the rust dust down when i wire cup wheel i was going to do a 4.500 crank in a 9.800 deck block i have done the 4 3/8 and the 4 1/4 are not much of a challenge as well as the 4.3/4 in the 10.200 hey jerry sounds like you do have fun at your shop need a guy to push a broom

Originally Posted by jerry clayton

. We are trying to eliminate all those areas that we have seen botched up by people who werent as knowledgable as they gave themselves credit for

well i love to tell you about some of the one s i know.. i am sure you know more.. but i am still hopping for them to make it right with me i can not see how any one can build a race engine with out a mill lathe and hone and tig welder i pick up a sunnen hone some time ago to do pin fit i got so tired of guys buy mass kits and the rods were not pin fitted now if i could come up with a crank grinder and line bore

I was about to buy a crank grinder many years ago but they were so big and took up too much room for the use I'd got out of it. Now you can buy cranks from dozens of sources.
We are sorting out the pieces for a 600 in BBC---rite now today looks like 598 pieces are available but 4.610 pistons would be custom.

Originally Posted by jerry clayton

I was about to buy a crank grinder many years ago but they were so big and took up too much room for the use I'd got out of it. Now you can buy cranks from dozens of sources.
We are sorting out the pieces for a 600 in BBC---rite now today looks like 598 pieces are available but 4.610 pistons would be custom.

yes the 4.610 bore is what i have. rings are pricey i done all the bores sizes the 4.610 is my first one for myself .the deal with crank grinders it hard to get what i want for size and hold it some shops it is pot luck on what you get from them and you just can not go out and buy a crank grinder and make it pay for it self

Originally Posted by jerry clayton

we are in sort of the final area of diveloping the specs of a 427 small block chev engine---we want strenght, forged components, light weight(alum heads) run on pump gas, etc, etc

Any thoughts on a project like this????

Are you talking about cost or building. My aspect is this, if your looking at longevity with performance and keeping cost down, chevy wise being I have a 427sbc that I think is a somewhat moderate build and pushing 550hp on pump gas.

Dart block and looking at forged components
Crank, keeping the stroke down to 3.875 vs 4.0" will help in the aspect of durability as the piston skirt being a bit longer for more longevity as well as a 6" rod, this will also help in the aspect of using off the shelf cams without having to order small radious cams at a higher costs. A 4" stroke will work in a standard deck but in reality it is too long and in the aspect of looking for longevity without going to a taller deck block.
Pistons, finding a desired CR that will work with a variety of Heads that are available 64CC-76CC allowing your customers to have whichever compression ratio they want then you can buy Pistons in volume vs customized pistons for each build.
Heads: there are certainly plenty to choose from and this is where most of the HP is gained, for a lower CR build and possibly something for a streetrod pickup of a daily hauler truck keeping a smaller runner will help TQ and fuel economy, the higher performance crowd, AFR, Brodex, etc.


Not every guy out there is looking for killer HP but are only looking to be different than the 350/383 sbc. Even a lot of guys out there who want the bigger cubes for towing where as big blocks just suck gas. If you can keep the cost down to that of a competitors 383 build people will be buying them and then give them options as needed.