I can help. I was bitting my lip when I read the parts list of the first motor.. At 6% overdriven.. it did exactly what one would expect.. who knows what the timing was, and he had way too much boost on cast pistons. Those eddy carbs will work but need tweaking for a blower (you can't use their jetting out of the box), and those Z28 valve springs are way, way to weak on the seat to hold the boost and will hang the valves open resulting in an intake explosion.
He is already starting to make big mistakes with his new engine and needs serious guidance. His new combo should have bigger heads.. 180cc is a bit small for that blown SBC.. he should go with 195-200cc runners at the least for the 355ci. You can return them to Summit. Stop with that cam.. it is way way too big (unless this is a track only car) and you are trying to use it together with a small head.. doesn't make any sense.. he should go with a solid flat tappet with a 230-234 intake, 240-246 exhaust at .050 duration cam with 112-114 LSA. Use EDM lifters, please!, and break in carefully with the right oil. For that solid flat tappet, use 130-140lbs seat and not more than 360lbs open pressure. Be anal about these valve spring pressures.. a little too little, a little too much and you will be sorry one way or another with that blower motor. The springs on the heads he just bought cant even handle the lift of the cam he just bought. He is cutting way too many corners here that will cost him more money and misery in the end. A cheap 4340 forged Scat crank and H-beam rod would have been better. I wouldnt push more than 7lbs boost on the cast crank.
I dont know how tight his blower is but an average 6-71 at 6% overdrive on a 350ci engine will put you at 17.1lbs boost!! The engine was probably a higher compression all cast stocker and this suggests that advice is sorely needed before another gross blunder. He should start at 16% underdrive and not spin faster than 14% underdrive and not exceed 10lbs boost without more investment in the lower end. Actually I would advise he keep it to 8 lbs boots with 93 octane sunoco or the like
I have carb settings for those exact Eddy 750 carbs posted somewhere on this site that you should refer too as I used them on my blown 6-71 355ci.
Just make sure your static compression is ~8:1 or less.. I think you will be in the ball park with 72cc chambers and the 21cc dish pistons... that's about 7.9:1 compression.
Go for a Mallory pointless distributor (no vacuum advance) and proper ignition. Set initial timing at 18-20 degrees and do not exceed 32* total timing until you get a better handle on what you are doing and invest in an all forged lower end.
What fuel pump and fuel line size?? A mechanical will work fine here.
4 bolt main? using studs on the mains?
What oil pump?
You will want 1.75" primary tube headers.
If you PM me, I will guide you through this.
His old block was a 4 bolt main studded block with forged crank and stock rods with arp bolts and kb hyper flat tops.
he will be reusing the crank, since it is double keyed and forged and rods. he bought those forged pistons posted above in the parts list.
He built his own headers, since this was a custom VW build, not sure on the size.
he uses a fuel cell and electric pump and i believe 3/8" fuel line
his new pistons should put him around 7.9 to 1
he has the pulleys to get 12% underdriven thats the ones that came with the blower new. after a few passes and engine plugs damaged he thought he need more boost to fix the problem, so he installed the 6% overdrive pulleys.
he now says he's not married to the % , he said he would buy new pulleys to make it right if needed.
Anything I can scrap up from anyones personel experience or even anyones combo that working good for them that would be close to what he is trying to do would help,
I told him holley's when he started this project, I have the tuning parts everywhere and I know how to tune them. He should already know that since i run a tunnel ram on the street that super smooth.
His response, I shouldn't have to tune, I spend that much on carbs they need to work out of the box, so I'm getting eddy's, I don't have to do nothing with them.
I told him a nice set of aluminum heads in the beginning about 200cc.
His reply, this is a blower motor you don't need fancy heads , you are pushing air thru them, if you need more air to go thru just crank up the blower speed more those other heads are just a waste of money.
i told him about nice dist. with msd box of some sort.
You don't need those, back in the day all we had was points, nothing has changed since. if they ran with points back then it will run with points today.
I came to a point I gave up and I stopped going to his house to help, He would not take any advice and now I see him struggling to try and get this VW down the track and my heart goes out to him, he has spent lots of money, but stuck in his old ways and this is a PURE RACE CAR built from ground up
So it seems he is kinda taking advice and I'm trying to get him as much info as I can.
He is kinda set on the HOWARDS cam, his heads are good for 520 lift and the cam is .488/.510 net after you subtract the lash off the GROSS lift.