[Detroit Muscle in NZ]

I built my 350 with a 4 bolt block a scatt 3.48 cast steel aero crank, scat rods forged pistons, a 9.8.1 cr. ,crane Hyd roller with 234@0.050,242@o.o50 with 0.540in lift 0.560ex lift on a 112 lobe sep pn crn119841. has comp pro magnum 1.52 rockers,AFR eliminator 195 heads pn 1038, Edelbrock RPM air gap manifold, 1407- 750cfm Edl carb with choke taken out, full MSD dis and 6al with 35 deg timing, 1 3/4 buy 34in headers. The engine ran buitifaly on the dyno but am yet to put it in my car with a TKO 600 ,3.45.1 diff and 24od tyres that weighs around 3100lbs. I was very happy with the dyno graph wich showed 370ftlb at 2500rpm building to 420-425 ftlb at 3900-4500(very hard to see peak) hiting 400hp at5000rpm peaking at 430hp at 6000rpm and still holding over 400hp at 6800rpm corected to sae at 70F. I know all dynos read diferently but I was hoping for a litle more tourque and Hp in that range although the spread of power should make for a fairly quick ride. I was thinking of trying an edelbrock victor manifold and maybe some 1.6 rockers to see what that does. I guess whats confusing me is that these figures seam comparable to say Edelbrock RPM heads,trick flo ect as these AFR heads crack some impresive flow numbers in the 0.1-0.5 range I think arnd 285cfm at 0.6 lift on the inlet and over 200cfm on exhaust from a 195cc runner. Maybe I should try it in car first, On the Afr website it shows these heads on a 383 with same amount of cam,intake ect and it made 540ftlb 540 hp that works out to 1.4 ftlb per cube, mine is not even close at 1.2 ftlb per cube. Id love to here any ones thoughts on this thanks for your time.

[Rick WI]

You have just witnessed the real world versus the advertising world when it comes to dyno numbers. AFR's numbers are total crap. If you leave everything as is you will be amazed at how many "500+" HP magazine builds you beat at the track with your 430 real HP.

I don't think the Victor is going to do you any good at all. I'd guess I have done over 80 pulls comparing RPM intakes to Victors on my dyno with small blocks. The trend is very consistant, you loose below 6000 and gain a small amout on top. In your case it may carry the power from 5800 to 6000 better, by around 10 HP, but under that you will be at a loss. That is assuming it wasn't the roller valvetrain giving up around 6000.

On the dyno was the time to check rocker ratios. I'd have tried 1.6's on the intakes first.

If you would have tested something like an Edelbrock Performer RPM package on that same dyno on the same day you would have seen numbers in the 375 to 385 range.

I don't think you will be at all unhappy with the performance of that engine.

[SlowGTA]

"If you leave everything as is you will be amazed at how many "500+" HP magazine builds you beat at the track with your 430 real HP."

AMEN BROTHER!!

The engine in my GTA dyno'd at "only" 441 HP, You should hear the crying at the 1/8 mile track I run it at.....

Get the engine in the car and start dialing it in (both the car and the engine) and I think you'll be pleasantly surprised.. After you've gotten the most you can out of the whole package start thinking about what to do for more power...if you still want to.

There are a lot less hotrodders out there that have actually driven a true 400+ HP engine than just think they have....Hang out around a shop with a dyno for a few months and you wont believe the "500 HP" engines that can hardly pull 350. Most have too much carb, too much cam and crap heads no matter what the magazines told them.

You built a great engine and you should get it in the car and start having fun!!

[dawg]

edelbrock airgap intake is where its killin the numbers.
they just dont flow enough for those heads.
I had one and my numbers dropped conciderably.

[PRO 48 fleetline]

you also have to remeber your running a 350 not a 383 that 400 crank makes a good bit of differnece aswell it picks the bootom end up a good bit faster, and will make up the differnece aswell

[Detroit Muscle in NZ]

Thank you for all who have replied so far Id say they are good inteligent answers. I didnt try 1.6 rockers or a Victor at the time because usual story at time Id run out of money. One good thing I forgot to mention about these heads is they use Gen 3 valve stem size of 8mm and have smaller lighter retainers ect. I think they had arnd 140lbs on seat My Crane Hyd roller with crane retrofit hyd rollers and now rev kit would have easly spun over 7000rpm we never took it over 6800 though. My friend had a Comp hyd roller with comp lifters and it was all over by 6000rpm and had heaps of seat press. Love to hear who you guys and gals think make the best Hyd roller lifters I was very happy with Crane.

[hotrodf1]

Originally Posted by Detroit Muscle in NZ

Thank you for all who have replied so far Id say they are good inteligent answers. I didnt try 1.6 rockers or a Victor at the time because usual story at time Id run out of money. One good thing I forgot to mention about these heads is they use Gen 3 valve stem size of 8mm and have smaller lighter retainers ect. I think they had arnd 140lbs on seat My Crane Hyd roller with crane retrofit hyd rollers and now rev kit would have easly spun over 7000rpm we never took it over 6800 though. My friend had a Comp hyd roller with comp lifters and it was all over by 6000rpm and had heaps of seat press. Love to hear who you guys and gals think make the best Hyd roller lifters I was very happy with Crane.

I have the Comp cams Pro Magnum retro-roller lifters in my 406, with a 240/248 @ .050 cam (306/314 adv. Crane Thumper cam), 1.6 rockers all around (.590 lift), and i buzz it to 7500 on the track with no probs. no rev kit, etc., just valve springs. I don't even know what kind of springs. The guy that put the heads together put in the "right" ones I guess, I gave him the Crane cam card that talks about spring pressures etc. But I remember him saying, hmmm, that's not much pressure - so I know they aren't at all radical. Course, he does heads for 850HP sprint car motors, which are a little bit different

And I use a Team G intake, single plane. But I would love to try an RPM airgap to see if there was a difference. I had always heard the 400 could use a single plane without sacrificing too much on the bottom end though.

Perhaps he didn't have the right springs or something?

[383silverado]

Originally Posted by PRO 48 fleetline

you also have to remeber your running a 350 not a 383 that 400 crank makes a good bit of differnece aswell it picks the bootom end up a good bit faster, and will make up the differnece aswell

comp cams built a 355 and 383 with all the same components the 383 only made 20 hp and 43 ftlb more. a cam that might be wild in 350 is going mild in a 383, thus leaving 383 needing a larger cam = way more power than a 350

but i do agree that a 383 will make more bottom end torque and more peak power. period

read the article in the red box at the bottom left hand corner.

http://www.compcams.com/Community/Ar...> -1572959052

hey detriot muscle can you post a link to compare you engine to afr's ?