340 Build

[Tubbed440]

Originally Posted by Canuk74Charger

Why run a larger ratio rocker on the intake and less on the exhaust? I noticed racer Brown rockers come in sets like this, not sure the advantage of 1.6 & 1.5 to just all 1.6

This is basically a band-aid for heads that have a poor flow ratio between the intake and exhaust ports, like they were describing in earlier posts.

[Phil]

To help with the reversion.....it's basically going to slow down the exhaust port with the lower lift and help the intake port.....you want a spread between the two or you'll have cross flow issues.

[Cheapstreet_duster]

your right Mike i totally missed that part.
reversion would be a definate problem
cheapst.

[CUDA ROLAND]

Originally Posted by RacerHog

How Far up out of the hole are the pistons?

there out about .018 i ran it last year with the same heads and i never had a problem... i am running a .038 head gasket at crush..

[CUDA ROLAND]

i was talking to a round track racer about the reversion problem and he let me in on some header tricks that will kill a good part of it but it only works on a rpm moter and it will not help low to lower mid range.. it works the same way a mismatched intake duse.. the header flag has to be opend up biger than the exhust port is so wen the exhust trys to back track it hit the flats of the head and defleks the ehust away also in the colecter i will also have to ad a peac of metal that looks like a plus sign wear all for pieps are put together this is sopose to incres the header savenge to each cyl..he saide it worked on the dyno tests thay ran but the best fix is to put a biger intake valve and report the heads or replace the heads... if it dos not work for me,if the header thing do's not work out i will have to take in some more tranny side jobs to pay for a set of eddy heads.

[CUDA ROLAND]

http://www.summitracing.com/parts/HED-75134/ this is the headders i will run on the car..

[CUDA ROLAND]

well had to shut down the 340 build for almost 2 mounths, first the a/c unit took a dump had to raide my race car fund and have it fixed the 4 days later a big f-ing storm comes throught and lightning takes out my well had to have that fixed and it also took out my computer.. be doing side jobs and finaly was able to put some cash up to finish the motor,was in the poor house for a while all thats left to do is fresin up the carb it,s ben sitting for a year now...will git some pics posted soon...

[RacerHog]

Glad your (Still alive and well) !!!!!!!!!!!!!

[MrN2OBelvedere]

Break out your camera! I want to see this beast!

[CUDA ROLAND]

dont know about the beast thing just hopes it runs strong i am going to give you the final numbers to crunch and let me know what you think ok it, is a 346 ci with magnum heads had them worked again he used a home made fow bench intake final number was 256 exhust was 209, comp is 11.93 to 1,, hughs solid tapit cam 612 at .50 in 614 at .050 exh dur 256 in 257 exh. hughs cool face solid lifters,, 1.6 roller rockers...running a victor 340 intake matched to the heads 750 hp,, eagle crank,, h beam rods ,, forged pistons with molly rings, milling high flow pump hardend pump shaft,, 1/2 in high flow pick up windage tray and a 10 in deep pan msd pro billet dist, msd 6al box, 727 trans 3400 stall conv from cope transmissions 4.56 gear. 28 x 9 in slicks car with me in it just under 2750... don,t know how the new set up will run... ? ps my kid left the camera at the grand pearints houe have to over and git it for the pics

[CUDA ROLAND]

putting the finnishing touches on the motor and carb also repainting the engine compartment changing the color fo the car

[CUDA ROLAND]

victor 340 installed on my magnum 340 made my jig using a la head.. one thing about a victor is you cam look down the runners and see how thay line up with the intake poerts

[Dougie800]

Looks Awesome....

[CUDA ROLAND]

thanks man more pics to come as i butten it up and put it in the car,, car will be jet black with a clear coat not sure on the striping thinking about a red set. also going with a hemi dart hood scoop and a air horn up to it ....

[CUDA ROLAND]

what is the best to tune the motor for max power a chassie dyno or a engine dyno there are 2 local shopes hear one has an engine dyno $ 400 to use all day long and one has a chassie dyno $100 for every 3 pulls...anny thoughts ???

[Phil]

Chassis.....you'll load the engine with the drivetrain and get a true reading.

[CUDA ROLAND]

thanks i am conserned with the heads on the motor after mike looked at the flow numbers hope reversion dosnt kill the top end..