just wondering if this is a good combo and could I have an estimate on horsepower/et

350 standard bore
10.3:1 compression
xe274 cam
stock heads with pocket port and polish vortech heads later on when money permits
peformer rpm intake
2200-2400 stall converter
headers with 2 1/2 pipes with flows on the back
750 cfm holley or mabe 650 cfm throttle body with fuel injection
hei distributor with blaster coil
th350 with 3.23 gears in the back

this will be going in a 71 chevelle

widen the intake valves a little and put some nice rockers on there.

A real rough guess would be apporx 300hp. (+ - 20hp)

In general your combo looks to be sound,but as you know there will be many differing opinions.

A suggestion,you mentioned possibly going to a 600 cfm fuel inj and or vortec heads later on when more money was available. The fuel inj unit is nice but pricey but ,if you opt to keep your 750 cfm holley (650 cfm maybe a better choice for 350 cubes) and not get the fuel inj unit you could take the money you saved on that and put it where it will count most like the vortec heads that will add more power than the fuel inj will,the inj may even cost you a little power or at best wont add much power for the cost.

I admit i had an IROC with TPI and it had great throttle responce and was torquey but i have seen mult dyno test results that matched porperly tuned carbs against properly tuned F/I and the fuel inj was not that much better when you compaired the #'s but i know 1st hand it felt like the F/I was better.

Scott

if you're going for ET's then i'd change the gear to a 3.73 and it could use more stall, IMO. i had a flat top 355 with Dart S/R's (which aren't any better than stock heads), rpm intake, 3310 holley, 3000 stall and 4.10 gears, had a Lunati 292 .480 230@.050 cam, roller rockers, 1 5/8" headers 2 1/2" exhaust with Flowtech mufflers, it ran a best of an 8.61 @ 80mph. with a 750dp it ran an 8.56 @ 79mph. weighed 3760lbs with me in it, 1971 Chevelle. without any better gears than you have and a little under stalled, i'm guessing maybe 8.80's-8.90's in the 1/8mi.
i think your motor combo is pretty well matched, just not enough gear and convertor.
as far as the injection, i think it's a waste of money on anything other than an all out maximum effort race engine. as far as TPI, you'd probably move all the power peaks down lower, and lose about 25-50hp up top. seen that happen lots of times. usually it's been on an F-body car with a built motor and the TPI still on it, then swapping to an intake and carb usually picks them up 3 or 4 tenths. ;)

Hey M71,,,ask LRW over at the other board, his car is slower now than it was when it was carbureted,he had it dynoed and it still didnt perform like it should. His 60's may have improved with FI but thats it, too much money for me to spend on FI when a good carb is all you need. If you ask me WOT is WOT whether its fuel injection or carburetion, FI may make drivability a little better or part throttle response better,but I'll take a good old Holley anyday graemlins/thumbsup.gif

yeah, and that ain't no cheap fuel injection either. it's aftermarket all the way through. only way i can see it being able to make more power is in a Turbo or Blower. i think Fred's just playing around with this EFI because he's going to put a Procharger on that thing pretty soon.
i know he talks like he's poor as a church mouse and all, but damn, if that's poor, then i must be below poverty level. he spent more on this EFI and the new trans than i've ever spent on my car. i wish i was poor like him! ;)

Okay, i just recently bought this car:
1972 Chevelle 350
specs are :
350(.030 over to 355)
TH400(3spd)
11:1 pistons
edelbrock 750
new crank(350)
new rods
comp cam 275 specs are : "490 475 lift"
76cc heads
ported valves
12 bolt with 3.08s

i need help with this, i want to make it the right combo to be a great drag and also something i can drive to school.. i was considering putting in a 3600 or higher with 3.55s or 3.73 posi

but i would like expert opinion

p.s. "--" is what the guy that owned the car before me had written down, im not a pro at specs on cams but i think thats right

Which intake 72? I'd definately go with 3.73's minimum with a smallblock and I'd also go Holley 650dp for performance, vacuum secondaries for a little better mpg, but I'm one of those guys that say, "you can't say Holley and fuel mileage in the same sentence" face it,,,if you got a Holley on it,you won't keep your foot out of it graemlins/thumbsup.gif

im just going with the fi for driveablity issues and better throttle response remote start and a little better mpg. its not an aftermarket unit. I know a guy that mods and reprograms factory tbi setups from police caprices all im looking for with this combo is mid 13s. if any one has anr better combos I would glady appriciate it.

Originally posted by m71:
i had a flat top 355 with Dart S/R's (which aren't any better than stock heads), rpm intake, 3310 holley, 3000 stall and 4.10 gears, had a Lunati 292 .480 230@.050 cam, roller rockers, 1 5/8" headers 2 1/2" exhaust with Flowtech mufflers, it ran a best of an 8.61 @ 80mph. with a 750dp it ran an 8.56 @ 79mph. weighed 3760lbs with me in it, 1971 Chevelle. I have a similiar combo...how did that engine perform on the street in the low-end? Did you have the small valved S/R heads or the bigger 2.02/1.6 valves? DId you port them at all? What was your 60ft time?

JUst trying to pick your brain, I have a 355, world s/r small valved heads, with a tiny 203/212@.050 cam that runs low/mid 14s....need to do a cam change and some other things to try to get it to low 13s.

mine had 2.02/1.60's no port work, 67cc chambers. with the 750dp the best 60ft was a 1.76, with the vacuum sec 750 the best 60ft was a 1.80. somehow it had great bottom end for a 350, i'm guessing it was the convertor and gears that made that combo, because it had very little topend charge to it. HTH graemlins/thumbsup.gif

Which intake 72?


the intake is a edelbrock high-rise, not sure which one.. but also what stall should i probably get with the 3.73s