i'm wondering what u guys think this motor makes for power and what it will run, i'm gunna have it dynoed soon. it was in a 69 camaro and ran 10.9. new car is a 81 camaro, car has no a/c and full interior so no clue on weight.

its a 4 bolt 355,forged crank,forged flat top pistons ,pink rods, 12.3:1 compression
gm casting 492 heads massively ported (no clue what they flow but they they took the second biggest gasket fel-pro makes) with 2.02, 1.6 valves screw in studs bronze valve guides,has a gm performance parts cam i:262@.050 .488"
e:273@.050 .509" lsa 112. its a mechanical flat tappet. roller tip rockers 1.5:1 hardened pushrods valve lash is .024 intake .026 exhaust, titanium retaniers dual comp springs, double roller timing chain,i have a weiand single plane intake on it and i switch between a holley dominator 1050 and a holley 750. i use a stock hei with accel coil and module, msd wires. have 1 3/4 long tube headers open i also run electric cooling fans and a huge aluminum radiator so the car never gets over 170, 20w-50 oil, i run 93 pump gas with 34* base timing and no vacuum advance, has mechanical. 110 gph holley fuel pump mechanical(for now, my holley blue electric took a dump so i had this one new)
trans is a turbo 350 done-up shift kit and 3200 stall, i know now that is way to small. i need 4000
4:10 gear in 10 bolt

car has drag shocks on all 4 corners,sfc's, slide-a-links, 10"wide cheater slicks, a leaf spring out of each side on the back and 2" drop springs in the front, poly body mounts and control arm bushings.

i shift around 7500, it just feels good there.
o and u guys dont want pics cause u would be like that motor has that. u would have to here it run inorder to tell it has what it has. it idles in gear at 1050 any lower and it would stall, but suprisingly it never surges.

lets here predictions

 

12.3:1 on pump gas??????!!!!!??????? and iron heads? i'm guessing they're iron? something doesn't sound right. and are you sure that cam has 262/273@.050" with only 488"/509"? doesn't sound right either. and damn! 7500rpm? because it feels good there........lol. that's funny. hope the motor was well built and balanced. or, i hope you like the feel of running over engine parts as your oil pan craps them out.

if all IS right, and the 69 ran that #, there are a ton of variables. weight as you mentioned could be major depending on wether or not he has lightened his up. trans, converter, gears, tire size, suspension, track condition, etc. etc. etc. don't mean to bring you down or avoid the question. have you seen this car run these times? do you know for a fact it runs on ONLY premium pump gas? how well do you know the seller? and it almost sounds as though you already have the motor so you should know the answer to these Q's by now. if this motor really is what you've been led to believe it is, then i would be really surprised, and even more so if it lives long with the parts list you've given. it's not exactly a no expense spared list if you don't mind me saying. but then i don't know what you payed for it or what you can afford either. but from experience, i've bought a few back yard assembled motors in my younger days and know they usually don't live long without the good parts. i am now buying the motor in my sig. i'm taking a chance on it for 11k, but i know the engine builders reputation, and quality, and that to have it built with the same parts would cost me over 20k!!! i've heard it run and gone for a ride too so my confidence is way up there. not to mention the guy i'm buying it from is a mechanical(?) engineer. and knows his way around a car far more that i will likely ever be able to.

if it is what it is, i'll guess 480rwhp., and 11.30 1/4 mile. guessing your car is heavier. let us know when you find out. please excuse the long answer, and no offense intended.

later,
Dave

 

none of the maotor is a 10 second combination. and a flat top piston with a 492 head will not be 12:3 CR also a 2.02 valve in that head will not pull to 7500 it's probably struggling for air at 6500. lets assume that the cars in question are light. which neither a 69 i know or 81 camaro are light but lets assume they weigh 3000lbs it's going to take roughly 458 rwhp or 540 fwhp to run a 10.9 which that motor combo would be lucky to make 400 at the flywheel much less 458 at the wheels

 

no offense taken, its all fun and games.

some background.

the 69 camaro is full interior no a/c, only thing lighter about it is a fiberglass hood, he had slicks on the car basically the same suspension i have minus the front end work his was stock. he had a 5000 stall and i wanna say a 4.88 gear. it was a track only car. he had a turbo 400 trans with trans brake.

as for the disbelief about the engine

this engine was built in early 80's and he took it to the track maybe once a year on average. i trust the guy i've known him for a few years and my dad has worked with him for 25. he works at a chevy dealer with my dad, which explains why the use of gm type parts. and i have seen the car run 10.88 10.9 and a few low 11's. this motor has been in my 81 for about a year.
the 2.02 valve in the head is a typo its a 2.08. the compression i have no clue how he got that figure but he had a engine builder back in the day do all the math for him. and i am told they are flat top pistons, so thats all i can say on that. the cam is gm part number 3965754, and its in the 2003 gm performance parts book. the whole motor is balanced and blue printed. at the track he said he never shifted under 7k rpm. they are iron heads. thats all i have for now, the guy who built it has a book with all the specs, i will try and get it from him this week so i will know for sure what pistons and what not it has............he even has all the part numbers

 

In stock form no the 492's will not get you 12:3:1, but very possibly the heads have been angle-milled. A quick 125 thousanths off the heads(the standard "safe max") would easily get your compression at 12:3:1. I,m gonna guess 425rwhp. I mess with a lot of circle track engines that have .500 lift cams stock heads(unported but milled and with bigger valves) and 500cfm 2-barrels that put out 400-430 at the flywheel. So with your 4-barrel and ported heads you should be over 400 at the wheels.

 

lets see 69 camaro weight 3250 lbs, 81 camaro 3650lbs if not a z28 then add 100lbs. Thats 4 tenths then take in account your lot lower stall and gears. I would say about 12.20 to 12.30's. I think the cam if memory serves me right was really dead under 4500 rpms so your low stall might hurt even more just have to run it and see. If it does have old 492 casting heads with flat tops they have been angle milled and are really bad about cracking when this was done. these times will be with the 750 holley with the dominator I would hate to say i would say it would barely get in the 12's with that low of stall and the weight of the car. Takes a hell of a 350 to take that much carb. and like it. If it was mine first thing to change would be cam they make a whole lot better than the one in there now also at least a 4000 stall or if you want to really want to wake it up a 5500 if all you do is race it.