I have small block 327 Performance Questions
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I have small block 327 Performance Questions
Would like to make 450hp or better all motor. What would I need to achieve this. Would appreciate any help you can give, thanks!
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Originally Posted by Sneed
Would like to make 450hp or better all motor. What would I need to achieve this. Would appreciate any help you can give, thanks!
#3
please stay away from large journal cranks, why do you think all the nascar engs have there lg journal cranks cut down to small jou, LESS wear and rot mass,,, 327 will be great choice, as i have 2 of them and pound one to 8000 easily and the key is it better be balanced w good rods, steel crank, dont go cheap on the valve train..
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Originally Posted by 1969CAMARO
please stay away from large journal cranks, why do you think all the nascar engs have there lg journal cranks cut down to small jou, LESS wear and rot mass,,, 327 will be great choice, as i have 2 of them and pound one to 8000 easily and the key is it better be balanced w good rods, steel crank, dont go cheap on the valve train..
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I would start by getting a good set of aluminum heads with about 195cc intake runners, a hyd. roller cam, a air-gap style int manifold, a good carb (Demon, AED, Quick Fuel, etc),and a good multiple strike discharge ignition system. I would also recommend about 10- 10.5 to 1 compression on the motor. Make sure to get the motor balanced, this is probably the best money spent on a engine build. Make sure to have the machine work completed by a good machine shop. Don't cut any corners on your foundation, it is better to wait alittle bit longer than to have your investment come flying apart on you!
#6
hey goat cheese, im not smoking anything, and just look around, they are out there, and as for NASCAR dont really like the sport to much anyway, and hey isint goat cheese from a goats #$@&
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Originally Posted by 1969CAMARO
hey goat cheese, im not smoking anything, and just look around, they are out there, and as for NASCAR dont really like the sport to much anyway, and hey isint goat cheese from a goats #$@&
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#11
Originally Posted by 1969CAMARO
please stay away from large journal cranks, why do you think all the nascar engs have there lg journal cranks cut down to small jou, LESS wear and rot mass,,, 327 will be great choice, as i have 2 of them and pound one to 8000 easily and the key is it better be balanced w good rods, steel crank, dont go cheap on the valve train..
And there not using cranks made out of 1038 steel either.
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I`ve run the sj 327`s for years with no problems. First of all, they all have steel cranks so they are not "flimsy". Yes the rods are pretty weak but there are plenty of aftermarket ones available. The sj motors are not hard to find at all since they were made from 1962-1967. The lj 327`s are harder to find because they were only made from 68-69. I would`nt have a problem building a lj 327 if thats what I had. Yeah the sj stuff is lighter but not that much lighter. I would`nt use the 307 crank for a 7500-8000rpm motor since they are all cast. Try to find a lj steel 327 crank if thats the route you want to go. They are hard to find but are out there. It`s also going to take more than one of the "packages" to make 450hp from a 327 since they were designed for 350 motors and only put out about 420hp in a 350. For 450hp in a 327 you`ll need 10.5-11.1 compression, a set of AFR cnc 180cc heads, and a solid roller cam with about mid 240-mid 250@.050 and around .620 lift or so. My old 327 ran low 12`s @114mph and it was only abut 375-380hp and I had ported GM heads and a mild solid FT cam. i love 327`s and they are my favorite motors but unless you want to run alot of gear, like 4.56-4.88, and a high stall, your better off going with a 383. It`s alot easier to get 450hp from a 383 than a 327.
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Originally Posted by 68c10owner
I`ve run the sj 327`s for years with no problems. First of all, they all have steel cranks so they are not "flimsy". Yes the rods are pretty weak but there are plenty of aftermarket ones available. The sj motors are not hard to find at all since they were made from 1962-1967. The lj 327`s are harder to find because they were only made from 68-69. I would`nt have a problem building a lj 327 if thats what I had. Yeah the sj stuff is lighter but not that much lighter. I would`nt use the 307 crank for a 7500-8000rpm motor since they are all cast. Try to find a lj steel 327 crank if thats the route you want to go. They are hard to find but are out there. It`s also going to take more than one of the "packages" to make 450hp from a 327 since they were designed for 350 motors and only put out about 420hp in a 350. For 450hp in a 327 you`ll need 10.5-11.1 compression, a set of AFR cnc 180cc heads, and a solid roller cam with about mid 240-mid 250@.050 and around .620 lift or so. My old 327 ran low 12`s @114mph and it was only abut 375-380hp and I had ported GM heads and a mild solid FT cam. i love 327`s and they are my favorite motors but unless you want to run alot of gear, like 4.56-4.88, and a high stall, your better off going with a 383. It`s alot easier to get 450hp from a 383 than a 327.
Last edited by GOaT Cheese; 12-14-2006 at 12:29 AM.
#14
There are two very easy ways to build this motor. You must want to go pretty fast if you want that power level. A stock 300 hp 327 from an impala or camaro with the 1.94 cammel hump heads is a 12 second motor already with a simple cam change (30/30 will work but you can do better.) and a good performer rpm intake and double pumper holley. This motor will make about 400 hp with a mild hydraulic roller like 230/236 and .500/510. Shifts at 6200. No other change, except the 4.11 or lower gears it takes to put the motor in its power range.
Method 1 (the old fashon way)
12.5:1 popups with solid roller 270 dur at .050 and .550 lift.
5.57 gears with muncie
Leave at 7800
Shift at 7800
then new way
AFR 180s with Solid roller cam about 250 dur at .050 and as much lift as you can get for that
10.5:1 comp
Leave at 7200
Shift at 7200
4.88 gears with t56 or Richmond Doug nash copy
Note if using small journal rods go aftermarket Scat
If large Journal go aftermarket rods anyway. Cheap enough
New Large Journal cranks available from Scat 4340 forged @ $450
Ebay cheaper forged cranks @ $350
Henry
I love 327s
Method 1 (the old fashon way)
12.5:1 popups with solid roller 270 dur at .050 and .550 lift.
5.57 gears with muncie
Leave at 7800
Shift at 7800
then new way
AFR 180s with Solid roller cam about 250 dur at .050 and as much lift as you can get for that
10.5:1 comp
Leave at 7200
Shift at 7200
4.88 gears with t56 or Richmond Doug nash copy
Note if using small journal rods go aftermarket Scat
If large Journal go aftermarket rods anyway. Cheap enough
New Large Journal cranks available from Scat 4340 forged @ $450
Ebay cheaper forged cranks @ $350
Henry
I love 327s
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its not hard to make that much power out of a 327. We just had a student's project 327 on the dyno at SAM. It was 10.5:1, nice aluminum heads w/ victor jr intake, 230's @ .050 hydraulic roller, 750 holley, it made 480hp and about 460tq, and we only spun up to 6500rpms
#17
What kind of heads? I am sure that 230ish cam is an easy 400 hp with that compression and 462 castings, but what awesome heads were those at Sam? I would love a setup like that for my 55 Chevy. I miss my stock flattop 30/30 cammed 327. It was the most fun of all the factory parts motors I had.
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Originally Posted by 1969CAMARO
please stay away from large journal cranks, why do you think all the nascar engs have there lg journal cranks cut down to small jou, LESS wear and rot mass,,, 327 will be great choice, as i have 2 of them and pound one to 8000 easily and the key is it better be balanced w good rods, steel crank, dont go cheap on the valve train..
I have done 9 or 10 of these cranks for customers for their dirt and asphult modified cars and they do it for weight and balance and rod ratio and you have to offset grind the cranks so the oil holes don't end up in the radius of the crank.
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i happen to have a stock 327 block, crank, pistons, and rods, all orginal in my garage. i was going to build a 355 but now i'm wondering if i should just build the 327. what would u guys do 355 or 327?