darkvader0

How would you go about it?

Say you had an F-body with a high mileage LS1 and decided you were, when the time came, going to build a 427 for it. You were keeping it as a daily driver, so want to keep decent street manners. You are not going to 'cheap out,' but want to remain sensible and try to go for best value parts, rather than a 'dream' build.

This is what has been stirring in my noggin, but I don't really know where to start. I would like to hear how you would build one. From if you would keep your LS1 block, or get a new LS7 block? What crank/rods/pistons? What heads/cam? What intake? What fuel rail/injectors? How would you go about the whole process? Etc, etc, etc?

2000Hawk

iTrader: (5)

Well let's not forget also the other components you must consider. Your sig says your cars an M6(assuming that's the car in question) so you will have to take the clutch into account. I believe TSP can build you a 427 using the LS3 so there's one option. Like you said you may not go for the dream build, but don't want to go cheap. My suggestion is save for the best. That way you won't be disappointed, or spend more in the long run.
-Joel

ChucksZ06

iTrader: (9)

One of the short or long blong deals from Scoggins or another sponsor would be the way to go in my opinion. They all have prices for their engine packages. By the time you have your block resleeved you will be into it more than using an ls3 to get to 427. You cannot use your any of your existing parts anyway to build a good 427.

darkvader0

When I say not going for a dream build I mean there will not be a forged crank and titanium valves and things of that nature. Thinking more of sensible value type of a build. I was just curious what parts people would pick to go with their 427 build. Looking at those short/long block packages at TSP is what got me thinking.

PowerShift408

iTrader: (44)

Does it have to be a 427? If I were in your shoes, I would do a 402, just my personal opinion though.

MPM IV

iTrader: (3)

ERL performance sells a 454 shortblock for $5,000 that seems like a lot of motor for the money to me. I haven't seen anything in a 427 lately that made me think wow, thats a great deal.

Philip@HPE

iTrader: (3)

I would go with a Sleeved LS2 block or an LS3 block with a set of ported L92's to be honest. If you wanted to go to an aftermarket casting, you can't go wrong with AFR/TFS/Mast.

NemeSS

iTrader: (127)

i would build a 417ci engine out of a ls3 block.
but prolly end up with a iron 6.0 version of same ci
and use the new 230cc afr heads.
6.0 iron block is way lower priced than a ls3 or ls7 block

Shenlon

iTrader: (4)

For everyone that is recommending less than the OP's stated 427, what is the reasoning behind your recommendation? I'm also contemplating a build similar to what the OP is asking about and am curious why there are recommendations for a 402, 416, 454, etc.

Not trying to hijack your thread OP, hope you don't mind.

darkvader0

Don't mind at all. Honestly, I just like the sound of a 427. When I was a kid, that was the motor that fascinated me. Now I want to build one. I'll be a very happy camper running around in my 99 T/A knowing that there's a 427 under the hood that I built.

It may sound illogical, but just *something* about the "427" I like. Unless there is some major drawback to it compared to the 402, 408, 417 builds (maybe the 4.125" bore presents problems?) I would really like to do a 4.125"x4.00" 427cid.

I'm going to have to check to see if LS3 block is the correct bore, but that LS3 + L92 sounds like something along the lines of what I have in mind.

Philip@HPE

iTrader: (3)

The most common 427 LS3 setups use a 4.070 x 4.100 but if you are wanting a 4.125 bore 427 then I would suggest a sleeved LS2 block. It will be much stronger than a stock sleeved LS3 which is always an added bonus.

9secondsflat

I would call vengeance...they use proline for their builds and are 100% bullet proof regardless of what rods/crank/piston combo..

SSPerformance

iTrader: (76)

I whould use a LS7 block a set of MAST ls7 heads

PowerShift408

iTrader: (44)

The only reason I suggested a 402 was the price difference and it would yield nearly identical results. I figured the mystique of the number itself was important to you. If that is what you want, I would definitely go 4.125'' bore x 4'' stroke.

darkvader0

Thanks for the feedback. It's really helping me get pointed in the right direction.

Right now I am wondering how difficult it is to resleeve my current LS1 block to a 4.125" bore. From what I am reading there are some complications using a newer LS2/LS3 block in an F-body (sensor & wiring harness issues).

Orange Juice

iTrader: (3)

I have to admit that I did exactly what you are talking about. I wanted a 427 as much for the mistique of the engine as much as anything else. I originally was going to use an ls3 block but after talking to the builder and because it was still in the budget I went with an ls7 because of the stock larger bore which gives you better flow around the valve. I already had a 90/90 intake so went with a cathedral head. As it turned out it was the same price to increase the stroke so I ended up with a 442. Some of the builders I spoke with wanted to sleeve an ls2 block but because I wasn't going to spray or boost the motor I felt that the ls7 would serve my purposes fine.
Just beware that you are going to have to budget for a rearend that will handle the torque. Also I am still trying to put together an exhuast system that isn't choking the motor.

darkvader0

Is there anything stopping me from resleeving my LS1 to 4.125" rather than going with reseleeved LS2 or LS3?

Shenlon

iTrader: (4)

The LS1 block has to be wetsleeved which is a more expensive option than resleeving an LS2/3 block which can be dry-sleeved. I have no idea about any durability or performance differences between wet and dry sleeving, I just know that wet sleeving costs more and is done by fewer people.

Nitroused383

iTrader: (10)

LS7 block, heads, intake!

WKMCD

iTrader: (2)

This guy built a nice very mild 403 that made 530/480 with a small cam. that build eventually turned into a 427..still small cam/mild build that make 577/530.

https://ls1tech.com/forums/generatio...b-c-d-e-f.html